United States

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-K

[X] Annual Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

For the fiscal year ended:

December 31, 2012

[ ] Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

For the transition period from _______________ to _______________

SECURITIES REGISTERED PURSUANT TO SECTION 12(b) OF THE ACT:

SECURITIES REGISTERED PURSUANT TO SECTION 12(g) OF THE ACT:

Indicate by checkmark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.

Indicate by checkmark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.

Indicate by check mark whether the registrants (1) have filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrants were required to file such reports) and (2) have been subject to such filing requirements for the past 90 days. Yes [X] No [ ]

Indicate by check mark whether the registrants have submitted electronically and posted on their corporate Web sites, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrants were required to submit and post such files): Yes [X] No [ ]

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of registrants' knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K. [ ]

Indicate by check mark if the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See definition of "large accelerated filer," "accelerated filer," and "smaller reporting company" in Rule 12b-2 of the Exchange Act:

Indicate by checkmark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).

The aggregate market value of the voting and nonvoting common equity held by nonaffiliates of each registrant as of June 30, 2012, was as follows:

The number of shares outstanding of each registrant's common stock as of February 1, 2013, were as follows:

DOCUMENTS INCORPORATED BY REFERENCE

Portions of MGE Energy, Inc.'s definitive proxy statement to be filed on or before March 28, 2013, relating to its annual meeting of shareholders, are incorporated by reference into Part III of this annual report on Form 10-K.

Madison Gas and Electric Company meets the conditions set forth in General Instruction (I)(1)(a) and (b) of Form 10-K and is therefore omitting (i.) the information otherwise required by Item 601 of Regulation S-K relating to a list of subsidiaries of the registrant as permitted by General Instruction (I)(2)(b), (ii.) the information otherwise required by Item 6 relating to Selected Financial Data as permitted by General Instruction (I)(2)(a), (iii.) the information otherwise required by Item 10 relating to Directors and Executive Officers as permitted by General Instruction (I)(2)(c), (iv.) the information otherwise required by Item 11 relating to executive compensation as permitted by General Instruction (I)(2)(c), (v.) the information otherwise required by Item 12 relating to Security Ownership of Certain Beneficial Owners and Management as permitted by General Instruction (I)(2)(c), and (vi.) the information otherwise required by Item 13 relating to Certain Relationships and Related Transactions as permitted by General Instruction (I)(2)(c).

Table of Contents

Filing Format

4

Forward-Looking Statements

4

Where to Find More Information

4

Definitions, Abbreviations, and Acronyms Used in the Text and Notes of this Report

5

PART I.

7

Item 1. Business.

7

Item 1A. Risk Factors.

14

Item 1B. Unresolved Staff Comments.

18

Item 2. Properties.

18

Item 3. Legal Proceedings.

19

Item 4. Mine Safety Disclosures.

19

PART II.

20

Item 5. Market for Registrants' Common Equity, Related Stockholder Matters, and Issuer Purchases of Equity Securities.  20

Item 6. Selected Financial Data.

23

Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations.

24

Item 7A. Quantitative and Qualitative Disclosures About Market Risk.

45

Item 8. Financial Statements and Supplementary Data.

48

Item 9. Changes in and Disagreements with Accountants on Accounting and Financial Disclosure.

105

Item 9A. Controls and Procedures.

105

Item 9B. Other Information.

105

PART III.

106

Item 10. Directors, Executive Officers, and Corporate Governance.

106

Item 11. Executive Compensation.

106

Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters.

106

Item 13. Certain Relationships and Related Transactions, and Director Independence.

106

Item 14. Principal Accounting Fees and Services.

107

PART IV.

108

Item 15. Exhibits and Financial Statement Schedules.

108

Signatures - MGE Energy, Inc.

117

Signatures - Madison Gas and Electric Company

118

Filing Format

This combined Form 10-K is being filed separately by MGE Energy, Inc. (MGE Energy) and Madison Gas and Electric Company (MGE). MGE is a wholly owned subsidiary of MGE Energy and represents a majority of its assets, liabilities, revenues, expenses, and operations. Thus, all information contained in this report relates to, and is filed by, MGE Energy. Information that is specifically identified in this report as relating solely to MGE Energy, such as its financial statements and information relating to its nonregulated business, does not relate to, and is not filed by, MGE. MGE makes no representation as to that information. The terms "we" and "our," as used in this report, refer to MGE Energy and its consolidated subsidiaries, unless otherwise indicated.

Forward-Looking Statements

This report, and other documents filed by MGE Energy and MGE with the Securities and Exchange Commission (SEC) from time to time, contain forward-looking statements that reflect management's current assumptions and estimates regarding future performance and economic conditions—especially as they relate to future load growth, revenues, expenses, capital expenditures, financial resources, regulatory matters, and the scope and expense associated with future environmental regulation. These forward-looking statements are made pursuant to the provisions of the Private Securities Litigation Reform Act of 1995. Words such as "believe," "expect," "anticipate," "estimate," "could," "should," "intend," and other similar words generally identify forward-looking statements. Both MGE Energy and MGE caution investors that these forward-looking statements are subject to known and unknown risks and uncertainties that may cause actual results to differ materially from those projected, expressed, or implied.

The factors that could cause actual results to differ materially from the forward-looking statements made by a registrant include (a) those factors discussed in Item 1A. Risk Factors, Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations, and Item 8. Financial Statements and Supplementary Data, and (b) other factors discussed herein and in other filings made by that registrant with the SEC.

Readers are cautioned not to place undue reliance on these forward-looking statements, which apply only as of the date of this report. MGE Energy and MGE undertake no obligation to publicly release any revision to these forward-looking statements to reflect events or circumstances after the date of this report.

Where to Find More Information

The public may read and copy any reports or other information that MGE Energy and MGE file with the SEC at the SEC's public reference room at 100 F Street, NE, Washington, D.C. 20549. The public may obtain information on the operation of the Public Reference Room by calling the SEC at 1-800-SEC-0330. These documents also are available to the public from commercial document retrieval services, the website maintained by the SEC at http://www.sec.gov, MGE Energy's website at http://www.mgeenergy.com, and MGE's website at http://www.mge.com. Copies may be obtained from our websites free of charge. Information contained on MGE Energy's and MGE's websites shall not be deemed incorporated into, or to be a part of, this report.

Definitions, Abbreviations, and Acronyms Used in the Text and Notes of this Report

Abbreviations, acronyms, and definitions used in the text and notes of this report are defined below.

PART I.

Item 1. Business.

MGE Energy operates in the following business segments:

·

Regulated electric utility operations – generating, purchasing, and distributing electricity through MGE.

·

Regulated gas utility operations – purchasing and distributing natural gas through MGE.

·

Nonregulated energy operations – constructing, owning, and leasing electric generating capacity that assists MGE through MGE Energy's wholly owned subsidiaries MGE Power Elm Road and MGE Power West Campus.

·

Transmission investments – representing our investment in American Transmission Company LLC, a company engaged in the business of providing electric transmission services primarily in Wisconsin.

·

All other – investing in companies and property that relate to the regulated operations and financing the regulated operations, through its wholly owned subsidiaries MAGAEL and CWDC, and Corporate functions.

MGE's utility operations represent a majority of the assets, liabilities, revenues, expenses, and operations of MGE Energy. MGE Energy's nonregulated energy operations currently include an undivided interest in two coal-fired generating units located in Oak Creek, Wisconsin, which we refer to as the Elm Road Units, and an undivided interest in a cogeneration facility located on the Madison campus of the University of Wisconsin, which we refer to as the West Campus Cogeneration Facility or WCCF.

As a public utility, MGE is subject to regulation by the PSCW and the FERC. The PSCW has authority to regulate most aspects of MGE's business including rates, accounts, issuance of securities, and plant siting. The PSCW also has authority over certain aspects of MGE Energy as a holding company of a public utility. FERC has jurisdiction, under the Federal Power Act, over certain accounting practices and certain other aspects of MGE's business.

MGE Energy's subsidiaries are also subject to regulation under local, state, and federal laws regarding air and water quality and solid waste disposal. See "Environmental" below.

MGE Energy was organized as a Wisconsin corporation in 2001. MGE was organized as a Wisconsin corporation in 1896. Their principal offices are located at 133 South Blair Street, Madison, Wisconsin 53703, and their telephone number is 608-252-7000.

Electric Utility Operations

MGE distributes electricity in a service area covering a 316 square-mile area of Dane County, Wisconsin. The service area includes the city of Madison, Wisconsin. It owns or leases ownership interests in electric generation facilities located in Wisconsin and Iowa.

At December 31, 2012, MGE supplied electric service to approximately 140,000 customers, with approximately 90% located in the cities of Fitchburg, Madison, Middleton, and Monona and 10% in adjacent areas. Of the total number of customers, approximately 86% were residential and 14% were commercial or industrial. Electric retail revenues for 2012, 2011, and 2010 were comprised of the following:

Electric operations accounted for approximately 73.7%, 69.5%, and 68.5% of MGE's total 2012, 2011, and 2010 regulated revenues, respectively.

See Item 2. Properties, for a description of MGE's electric utility plant.

MGE is registered with two regional entities, The Midwest Reliability Organization and Reliability First Corporation. The essential purposes of these entities are the development and implementation of regional and NERC reliability standards; and determining compliance with those standards, including enforcement mechanisms.

Transmission

American Transmission Company LLC (ATC) is owned by the utilities that contributed facilities or capital to it in accordance with Wisconsin law. ATC's purpose is to provide reliable, economic transmission service to all customers in a fair and equitable manner. ATC plans, constructs, operates, maintains, and expands transmission facilities that it owns to provide adequate and reliable transmission of power. ATC is regulated by FERC for all rate terms and conditions of service and is a transmission-owning member of the MISO.

Regional Transmission Organizations

MISO

MGE is a nontransmission owning member of the MISO. MISO, a FERC approved RTO, is responsible for monitoring the electric transmission system that delivers power from generating plants to wholesale power transmitters. MISO's role is to ensure equal access to the transmission system and to maintain or improve electric system reliability in the Midwest.

MISO maintains a bid-based energy market. MGE offers substantially all of its generation on the MISO market and purchases much of its load requirement from the MISO market in accordance with the MISO Tariff. MGE participates in the ancillary services market (ASM) operated by MISO. The ASM is an extension of the existing energy market in which MISO assumes the responsibility of maintaining sufficient generation reserves. In the ASM, MISO provides the reserves for MGE's load, and MGE may offer to sell reserves from its generating units.

MGE participates in the voluntary capacity auction, which provides an optional monthly forum for buyers and sellers of aggregate planning resource credits to interact. Load serving entities may participate in the voluntary capacity auction potentially to obtain the necessary aggregate planning resource credits needed to meet their planning reserve margin requirement. Generator owners may participate to sell any excess aggregate planning resource credits that are not needed by them.

PJM

MGE is a member of PJM. PJM, an RTO, is a neutral and independent party that coordinates and directs the operation of the transmission grid within its area of coverage, administers a competitive wholesale electricity market, and plans regional transmission expansion improvements to maintain grid reliability and relieve congestion.

Fuel supply and generation

MGE satisfies its customers' electric demand with internal generation and purchased power. During the years ended December 31, 2012, 2011, and 2010, MGE's electric energy delivery requirements were satisfied by the following sources:

Sources used depend on market prices, generating unit availability, weather, and customer demand.

Coal

MGE and two other utilities jointly own Columbia, a coal-fired generating facility, which accounts for 29% (225 MW) of MGE's net summer rated capacity. Power from this facility is shared in proportion to each owner's ownership interest. MGE has a 22% ownership interest in Columbia. The other owners are WPL (a subsidiary of Alliant), which operates Columbia, and WPSC. The Columbia units burn low-sulfur coal obtained (pursuant to contracts from one to five years in length) from the Powder River Basin coal fields located in Wyoming. The coal inventory supply for the Columbia units increased from approximately 31 days on December 31, 2011, to approximately 37 days on December 31, 2012. The co-owners' current goal is to maintain approximately a 35 day inventory.

MGE Power Elm Road and two other owners own undivided interests in the coal-fired Elm Road Units in Oak Creek, Wisconsin, which accounts for 14% of MGE's net summer rated capacity. Power from this facility is shared in proportion to each owner's ownership interest. MGE Power Elm Road owns an 8.33% ownership interest in the Elm Road Units and its interest in the Elm Road Units is leased to MGE. The other owners are Wisconsin Energy Corporation (which owns approximately 83% of the Elm Road Units and is the operator of those units) and WPPI Energy, Inc. The Elm Road Units burn bituminous coal obtained (pursuant to contracts) from northern West Virginia and southwestern Pennsylvania. MGE's share of the coal inventory supply for the Elm Road Units increased from approximately 36 days on December 31, 2011, to approximately 49 days on December 31, 2012.

See discussion below under Nonregulated Operations regarding MGE's interest in the Elm Road Units.

Natural gas and oil

MGE owns gas-fired combustion turbines. These turbines are primarily located in Madison and Marinette, Wisconsin, and have a total of 155 MW of net summer rated capacity.

MGE also owns the Blount Generating Facility located in Madison, Wisconsin, which is fueled by gas and other alternative renewable sources. As planned, capacity was reduced at Blount from 190 MW to 100 MW as of December 31, 2011.

See discussion below under Nonregulated Operations regarding MGE's interest in the West Campus Cogeneration Facility.

Renewable generation sources

MGE owns 30 MW, consisting of 18 turbines, in a wind-powered electric generating facility in Worth County, Iowa. MGE also owns 11 MW, consisting of 17 turbines, in a wind-powered electric generating facility in Kewaunee County, Wisconsin.

Purchased power

MGE enters into short and long-term purchase power commitments with third parties to meet a portion of its anticipated electric energy supply needs. The following table identifies purchase power commitments at December 31, 2012, with unaffiliated parties for the next five years.

Gas Utility Operations

MGE transports and distributes natural gas in a service area covering 1,631 square miles in seven south-central Wisconsin counties. The service area includes the city of Madison, Wisconsin and surrounding areas.

At December 31, 2012, MGE supplied natural gas service to approximately 145,000 customers in the cities of Elroy, Fitchburg, Lodi, Madison, Middleton, Monona, Prairie du Chien, Verona, and Viroqua; 24 villages; and all or parts of 45 townships. Of the total number of customers, approximately 89% were residential and 11% were commercial or industrial.

Gas revenues for 2012, 2011, and 2010 were comprised of the following:

Gas operations accounted for approximately 26.3%, 30.5%, and 31.5% of MGE's total 2012, 2011, and 2010 regulated revenues, respectively.

MGE can curtail gas deliveries to its interruptible customers. Approximately 20% and 14% of retail gas deliveries in 2012 and 2011, respectively, were to interruptible customers.

Gas supply

MGE has physical interconnections with ANR and NNG. MGE's primary service territory, which includes Madison and the surrounding area, receives deliveries at one NNG and four ANR gate stations. MGE also receives deliveries at NNG gate stations located in Elroy, Prairie du Chien, Viroqua, and Crawford County. Interconnections with two major pipelines provide competition in interstate pipeline service and a more reliable and economical gas supply mix, which includes gas from Canada and from the mid-continent and Gulf/offshore regions in the United States.

During the winter months, when customer demand is high, MGE is primarily concerned with meeting its obligation to firm customers. MGE meets customer demand by using firm supplies under contracts finalized before the heating season, supplies in storage (injected during the summer), and other firm supplies purchased during the winter period.

By contract, a total of 5,399,949 Dth of gas can be injected into ANR's storage fields in Michigan from April 1 through October 31. These gas supplies are then available for withdrawal during the subsequent heating season, November 1 through March 31. Using storage allows MGE to buy gas supplies during the summer season, when prices are normally lower, and withdraw these supplies during the winter season, when prices are typically higher. Storage also gives MGE more flexibility in meeting daily load fluctuations.

MGE's contracts for firm transportation service of gas include winter maximum daily quantities of:

·

162,150 Dth (including 96,078 Dth of storage withdrawals) on ANR.

·

60,108 Dth on NNG.

Nonregulated Energy Operations

MGE Energy, through its subsidiaries, has developed generation sources that assist MGE in meeting the electricity needs of its customers.

Elm Road

MGE Power Elm Road and two other owners own undivided interests in the coal-fired Elm Road Units in Oak Creek, Wisconsin. Unit 1 entered commercial operation in February 2010, and has the capacity to produce 615 MW of electricity. Unit 2 entered commercial operation in January 2011, and has the capacity to produce 615 MW of electricity. Wisconsin Energy Corporation owns approximately 83% of the Elm Road Units and is the operator for those units. MGE Power Elm Road owns an 8.33% ownership interest in both units. Both units are used to provide electricity to MGE's customers.

MGE leases MGE Power Elm Road's ownership interest in the Elm Road Units pursuant to two separate facility leases. The financial terms of each facility lease include a capital structure of 55% equity and 45% long-term debt, return on equity of 12.7%, and a lease term of 30 years. At the end of the respective lease terms, MGE may, at its option, renew the facility lease for an additional term, purchase the leased ownership interest at fair market value or allow the lease to end. The Unit 1 and Unit 2 leases commenced with the commercial operation of each respective unit.

WCCF

MGE Power West Campus and the UW jointly own undivided interests in a natural gas-fired cogeneration facility on the UW campus. The facility has the capacity to produce 20,000 tons of chilled water, 500,000 pounds per hour of steam, and approximately 150 MW of electricity. The UW owns 45% of the facility, which represents its interest in the chilled-water and steam assets. These assets are used to meet the UW's growing need for air-conditioning and steam-heat capacity. MGE Power West Campus owns 55% of the facility, which represents its interest in the electric generating assets. These assets are used to provide electricity to MGE's customers. The UW's share of the plant and portion of the earnings from the WCCF are not reflected in the consolidated financial statements of MGE Energy or MGE. MGE Power West Campus' share of the cost of this project is reflected in property, plant, and equipment on MGE Energy's and MGE's consolidated balance sheets.

MGE leases the electric generating assets owned by MGE Power West Campus and is responsible for operating the entire facility. The financial terms of the facility lease include a capital structure of 53% equity and 47% long-term debt, return on equity of 12.1%, and a lease term of 30 years. At the end of the lease term in 2035, MGE may, at its option, renew the facility lease for an additional term, purchase the generating facility at fair market value or allow the lease contract to end.

Transmission Investments

ATC owns and operates electric transmission facilities primarily in Wisconsin. MGE received an interest in ATC when it, like other Wisconsin electric utilities, contributed its electric transmission facilities to ATC. That interest is presently held by MGE Transco, which is jointly owned by MGE Energy and MGE. At December 31, 2012, MGE Transco held a 3.6% ownership interest in ATC.

In April 2011, ATC and Duke Energy announced the creation of a joint venture, Duke-American Transmission Company (DATC), that seeks to build, own, and operate new electric transmission infrastructure in North America to address increasing demand for affordable, reliable transmission capacity.

Environmental

MGE is subject to frequently changing local, state, and federal regulations concerning air quality, water quality, land use, threatened and endangered species, hazardous materials handling, and solid waste disposal. These regulations affect the manner in which MGE conducts its operations, the costs of those operations, as well as some capital and operating expenditures. They can also affect the siting, timing, and cost of new projects or other significant actions affecting the environment. Some of the most significant are addressed below. MGE is not able to predict with certainty the direction of future regulations or if compliance with any such regulations will involve additional expenditures for pollution control equipment, plant modifications, or curtailment of operations. Such actions could reduce capacity or efficiency at existing plants or delay the construction and operation of future generating facilities. MGE management would expect to seek and receive rate recovery for costs associated with approval and installation of any required pollution controls.

Air Quality

Air quality regulations promulgated by the Environmental Protection Agency (EPA) and Wisconsin Department of Natural Resources (WDNR) in accordance with the Federal Clean Air Act and the Clean Air Act Amendments of 1990 impose restrictions on emission of particulates, sulfur dioxide (SO₂), nitrogen oxides (NO_x), hazardous air pollutants and other pollutants, and require permits for operation of emission sources. These permits must be renewed periodically. Various newly enacted and/or proposed federal and state initiatives are expected to result in additional operating and capital expenditure costs for fossil-fueled electric generating units.

Vacation of EPA's Cross State Air Pollution Rule (CSAPR) and Reinstatement of the Clean Air Interstate Rule (CAIR)

EPA has promulgated three interstate air pollution rules consisting of the NO_x SIP Call, the Clean Air Interstate Rule (CAIR), and the Cross-State Air Pollution Rule (CSAPR). These rules were each designed to reduce nitrogen oxide (NO_x) and/or sulfur dioxide (SO₂) air emissions from electric generating units (EGUs) located in Wisconsin and other states. NO_x and SO₂ interact in the atmosphere to form ambient ozone and fine particulate matter pollution. As explained below, only the CAIR currently affects MGE's generation assets.

In 2000, the U.S. Court of Appeals for the D.C. Circuit held that Wisconsin had been illegally included in a portion of the NO_x SIP Call, but stayed the remaining legal challenges to the rule pending EPA's development of additional interstate transport rules. At this time, the requirements of the NO_x SIP Call and the costs of compliance remain uncertain in view of the developments affecting the interstate transport rules.

In 2005, EPA promulgated the CAIR imposing additional controls on NO_x and SO₂ emissions from EGUs located in Wisconsin and other states. However, in December 2008, the U.S. Court of Appeals for the D.C. Circuit remanded the CAIR to the EPA with directions to revise or replace the rule. The Court's remand order directed that the CAIR remain in effect until the EPA promulgated a replacement rule. The Court's order did not include a deadline for the EPA to act.

In August 2011, the EPA responded to the remand of the CAIR by promulgating the CSAPR. However, in August, 2012, the U.S. Court of Appeals for the D.C. Circuit vacated CSAPR and instructed the EPA to continue administering the CAIR pending finalizing a valid alternative program to control interstate pollution. In January 2013, the U.S. Court of Appeals for the D.C. Circuit denied EPA's petition for reconsideration decision en banc. At this time, the CAIR remains currently effective.

The CAIR generally requires NO_x and SO₂ emission reductions from fossil fuel-fired EGUs (25 MW or greater) in the eastern half of the United States in two phases and includes a regional cap-and-trade system. The first phase (currently in place) requires annual regional emission reductions from 2003 levels of 55% for NO_x and 40% for SO₂. The second phase, scheduled to begin in 2015, reduces regional NO_x and SO₂ emissions further from 2003 levels to 65% and 70%, respectively. MGE owns or has partial ownership in several generation units currently subject to the CAIR: Blount, Columbia, Elm Road Units, and its combustion turbines located in West Marinette and Fitchburg.

Our evaluation of the CAIR demonstrates that MGE is in compliance with the CAIR's Phase I requirements without capital expenditures or modifications to our operations. We have also evaluated our potential expenditures if the CAIR remains in place for the Phase II reductions. Based on our Phase II evaluation, MGE will be able to meet Phase II NO_x emissions reductions through using our NO_x allowances provided through the rule, and we will meet Phase II SO₂ emissions reductions through installation of pollution controls. New SO₂ controls at Columbia are already underway and are planned to be completed by early 2014 (see the discussion regarding the Columbia Environmental Project below). Once the new environmental control project is completed at Columbia, it is expected that the plant will emit SO₂ below anticipated Phase II CAIR allocation levels. MGE expects that any costs incurred to meet Phase II of the CAIR will be fully recoverable through rates. MGE will continue monitoring the EPA's actions in response to the August 2012 CSAPR vacature, and the stayed NO_x SIP Call litigation.

Clean Air Visibility Rule (CAVR)

Air modeling indicates that SO₂ and NO_x emissions (and to a lesser extent particulate matter, or PM) from Columbia may impair visibility at certain Class I Scenic Areas and may therefore be subject to the best available retrofit technology (BART) regulations, a subsection of the EPA's Clean Air Visibility Rule (CAVR), which may require pollution retrofits to be installed at Columbia. The EPA had proposed that Columbia's compliance with emissions limitations in the CAIR and the CSAPR could also serve as compliance with the BART regulations for SO₂ and NO_x emissions. However, this proposal is now uncertain because of the D.C. Court of Appeals remanding the CAIR to EPA and vacating the CSAPR. At this time, the BART regulatory obligations, compliance strategies and costs remain uncertain.

Columbia

Columbia is a coal-fired generating station operated by WPL in which WPL, WPSC, and MGE have ownership interests. In December 2009, the EPA sent a Notice of Violation (NOV) to MGE as one of the co-owners of Columbia. The NOV alleges that WPL and the Columbia co-owners failed to comply with appropriate pre-construction review and permitting requirements and, as a result, violated the Prevention of Significant Deterioration program requirements, Title V Operating Permit requirements of the CAA, and the Wisconsin SIP. In September 2010, the Sierra Club filed a civil lawsuit against WPL alleging violations of the CAA at Columbia and other Wisconsin facilities operated by WPL. See Footnote 18.e for additional information regarding these matters. MGE believes that the parties have reached a tentative agreement on the general terms of a settlement with the EPA and Sierra Club regarding various facilities, including Columbia. The parties are currently negotiating a consent decree based upon those general terms, which may change during the negotiations.

Solid Waste

Proposed Regulation of Coal Combustion Byproducts

The EPA published a proposed rule on May 4, 2010, to regulate coal combustion byproducts from the electric generating sector. If adopted, the final regulations may require new or additional monitoring of storage sites, may re-classify ash and other coal combustion byproducts, and may regulate ash storage site structural design. MGE is evaluating the impact of these proposed regulations on our operations. The EPA has indicated that the final rules will likely not be issued until late 2013 or early 2014. It is not possible for MGE to project the potential costs associated with the implementation of any of these initiatives until the rule is finalized.

Global climate change

MGE is a producer of GHG emissions, primarily from the fossil fuel generating facilities it utilizes to meet customers' energy needs, as well as from its natural gas pipeline system and fleet vehicles. Climate change and the regulatory response to it could significantly affect our operations in a number of ways, including increased operating costs and capital expenditures, restrictions on energy supply options, permitting difficulties, and emission limits. MGE management would expect to seek and receive rate recovery of such compliance costs, if and when required. MGE will continue to monitor proposed climate change legislation and regulation.

MGE is already addressing GHG emissions through voluntary actions. In 2005, MGE announced its Energy 2015 Plan, which commits to ensuring a balanced, economic energy supply with reduced environmental emissions. The Plan emphasizes increased renewable energy, energy efficiency, and new cleaner generation – three strategies that reduce GHG emissions. Under MGE's Energy 2015 Plan and other actions, our CO₂ emissions are currently projected to decline from 2005 to 2015 even though total system energy is estimated to increase.

Climate Change Legislation

Federal Actions on Climate Change

Currently, there is no specific federal proposal for climate change legislation in 2013. Several bills related to GHG regulation including bills to limit, prevent or delay the EPA's regulation of GHGs under the current Clean Air Act have been proposed previously but none have become law to date.

State and Regional Actions on Climate Change

It is not expected that the Wisconsin Legislature will enact broad GHG regulation in 2013.

DNR's Green Tier Environmental Leadership Program

MGE is the first utility in Wisconsin to be designated to participate in the highest level (Tier 2) of the DNR's Green Tier environmental leadership program. MGE is only the fifth state company to achieve Tier 2 status. Green Tier encourages a collaborative approach to environmental performance between the DNR and Wisconsin businesses, local governments, and other organizations. As part of Green Tier, participants voluntarily commit to reducing their environmental footprint by developing proactive management strategies. These plans act as a roadmap, helping organizations see opportunities to adopt new technologies and practices to continually improve their environmental performance.

MGE is participating in the Green Tier program to continue its voluntary commitment to superior environmental performance. In cooperation with DNR, MGE will set goals to make significant environmental improvements.

Employees

As of December 31, 2012, MGE had 688 employees. MGE employs 210 employees who are covered by a collective bargaining agreement with Local Union 2304 of the International Brotherhood of Electrical Workers and 96 employees who are covered by a collective bargaining agreement with Local Union No. 39 of the Office and Professional Employees International Union. Both of these collective bargaining agreements expire on April 30, 2015. There are also 5 employees covered by a collective bargaining agreement with Local Union No. 2006, Unit 6 of the United Steel, Paper and Forestry, Rubber, Manufacturing, Energy, Allied Industrial, and Service Workers International Union. This collective bargaining agreement expires on October 31, 2015.

Financial Information About Segments

See Footnote 23 of the Notes to Consolidated Financial Statements for financial information relating to MGE Energy's and MGE's business segments.

Executive Officers of the Registrants

Note: Ages, years of service, and positions as of December 31, 2012.

(a) Executive officer of MGE Energy and MGE.

(b) Executive officer of MGE.

Item 1A. Risk Factors.

MGE Energy and its subsidiaries, including MGE, operate in a market environment that involves significant risks, many of which are beyond their control. The following risk factors may adversely affect their results of operations, cash flows and market price for their publicly traded securities. While MGE Energy and MGE believe they have identified and discussed below the key risk factors affecting their business, there may be additional risks and uncertainties that are not presently known or that are not currently believed to be significant that may adversely affect their performance or financial condition in the future.

Regulatory Risk

We are subject to extensive government regulation in our business, which affects our costs and responsiveness to changing events and circumstances.

Our business is subject to regulation at the State and Federal levels. We are subject to regulation as a holding company by the PSCW. MGE is regulated by the PSCW as to its rates, terms and conditions of service; various business practices and transactions; financing; and transactions between it and its affiliates, including MGE Energy. MGE is also subject to regulation by the FERC, which regulates certain aspects of its business. The regulations adopted by the State and Federal agencies affect the manner in which we do business, our ability to undertake specified actions since pre-approval or authorization may be required, the costs of operations, and the level of rates charged to recover such costs. Our ability to attract capital is also dependent in part, upon our ability to obtain a fair return from the PSCW.

We face risk for the recovery of fuel and purchased power costs.

MGE burns natural gas in several of its peak electric generation facilities, and in many cases, the cost of purchased power is tied to the cost of natural gas. Under the electric fuel rules, MGE would defer electric fuel-related costs that fall outside a symmetrical cost tolerance band that is currently plus or minus 2%. Any over/under recovery of the actual costs is determined on an annual basis and will be adjusted in future billings to its electric retail customers. Under the electric fuel rules, MGE is required to defer the benefit of lower costs if its actual fuel costs fall outside the lower end of the range and would defer costs, less any excess revenues, if its actual fuel costs exceeded the upper end of the range. Excess revenues are defined as revenues in the year in question that provide MGE with a greater return on common equity than authorized by the PSCW in MGE's latest rate order. MGE assumes the risks and benefits of variances that are within the cost tolerance band.

We are subject to changing environmental laws and regulations that may affect our costs and business plans.

Our subsidiaries are subject to environmental laws and regulations that affect the manner in which they conduct business, including capital expenditures, operating costs and potential liabilities. Changes and developments in these laws and regulations may alter or limit our business plans, make them more costly, or expose us to liabilities for past or current operations.

Numerous environmental laws and regulations govern many aspects of our present and future operations, including air emissions, water quality, wastewater discharges, solid waste, threatened and endangered species and hazardous waste. These evolving regulations can introduce uncertainty with respect to capital expenditures and operational planning, and can introduce costly delays if previous decisions need to be revisited as a result of judicial mandate or regulatory change. These regulations generally require us to obtain and comply with a wide variety of environmental permits and approvals, and can result in increased capital, operating, and other costs and operating restrictions, particularly with regard to enforcement efforts focused on obligations under existing regulations with respect to power plant emissions and compliance costs associated with regulatory requirements. These effects can be seen not only with respect to new construction but could also require the installation of additional control equipment or other compliance measures such as altered operating conditions at existing facilities.

In addition, we may be a responsible party for environmental clean-up at current or future sites identified as containing hazardous materials or to which waste was sent that is subsequently determined to be hazardous. It is difficult to predict the costs potentially associated with a site clean-up due to the potential joint and several liability for all potentially responsible parties, the nature of the clean-up required and the availability of recovery from other potentially responsible parties.

Additionally, depending on their form and phase-in provisions, GHG emission restrictions could have the potential for a significant financial impact on MGE, including the cost to install new emission control equipment, purchase allowances, or do fuel switching.

Operating Risk

We are affected by weather, which affects customer demand and can affect the operation of our facilities.

The demand for electricity and gas is affected by weather. Very warm and very cold temperatures, especially for prolonged periods, can dramatically increase the demand for electricity and gas for cooling and heating, respectively, as opposed to the softening effect of more moderate temperatures. Our electric revenues are sensitive to the summer cooling season and, to a lesser extent, the winter heating season. Similarly, very cold temperatures can dramatically increase the demand for gas for heating. A significant portion of our gas system demand is driven by heating. Extreme summer conditions or storms may stress electric transmission and distribution systems, resulting in increased maintenance costs and limiting the ability to meet peak customer demand.

We are affected by economic activity within our service area.

Higher levels of development and business activity generally increase the numbers of customers and their use of electricity and gas. Likewise, periods of recessionary economic conditions generally adversely affect our results of operations.

Our ability to manage our purchased power costs is influenced by a number of uncontrollable factors.

We are exposed to additional purchased power costs to the extent that our power needs cannot be fully covered by the supplies available from our existing facilities and contractual arrangements. Those needs, and our costs, could be affected by:

·

Increased demand due to, for example, weather, customer growth, or customer obligations,

·

The inability to transmit our contracted power from its generation source to our customers due to transmission line constraints, outages, or equipment failures,

·

Reductions in the availability of power from our owned or contracted generation sources due to equipment failures, shortages of fuel or environmental limitations on operations, and

·

Failure to perform on the part of any party from which we purchase capacity or energy, whether due to equipment failures or other causes.

An unexpected change in demand or the availability of generation or transmission facilities can expose us to increased costs of sourcing electricity in the short-term market where pricing may be more volatile.

The equipment and facilities in our operational system are subject to risks which may adversely affect our financial performance.

Weather conditions, accidents, and catastrophic events, including terrorism, cyber terrorism, and acts of sabotage or war, can result in damage or failures of equipment or facilities and disrupt or limit our ability to generate, transmit, transport, purchase, or distribute electricity and gas. Efforts to repair or replace equipment and facilities may take prolonged periods or may be unsuccessful, or we may be unable to make the necessary improvements to our operational system, causing service interruptions. The resulting interruption of services would result in lost revenues and additional costs. We are also exposed to the risk of accidents or other incidents that could result in damage to or destruction of our facilities or damage to persons or property. Such issues could adversely affect revenues or increase costs to repair and maintain our systems.

Failure to attract and retain an appropriately qualified workforce could affect our operations.

Events such as an aging workforce and retirement of key employees without appropriate replacements may lead to operating challenges and increased costs. Some of the challenges include lack of resources, loss of knowledge, and length of time period associated with skill development. Failure to identify qualified replacement employees could result in decreased productivity and increased safety costs. If we are unable to attract and retain an appropriately qualified workforce, our operations could be negatively affected.

We face construction risk in connection with the completion of the Columbia environmental project.

The large-scale environmental project at the Columbia generating facility, which is being managed by WPL as plant operator, is subject to various risks that could cause costs to increase or delays in completion. These risks include shortages of, the inability to obtain, the cost of, and the consistency of, labor, materials and equipment; the inability of the general contractor or subcontractors to perform under their contracts; the inability to agree to terms of contracts or disputes in contract terms; work stoppages; adverse weather conditions; the inability to obtain necessary permits in a timely manner; changes in applicable laws or regulations; adverse interpretation or enforcement of permit conditions; governmental actions; legal action; and unforeseen engineering or technology issues. If the construction project is over budget, we may not be able to recover those excess costs. Inability to recover excess costs, or inability to complete the project in a timely manner, could adversely impact our financial condition and results of operations.

Financial Risk

We are exposed to commodity price risk relating to our purchases of natural gas, electricity, coal and oil.

We face commodity price risk exposure with respect to our purchases of natural gas, electricity, coal and oil, SO₂ allowances and risk through our use of derivatives, such as futures, forwards and swaps, to manage that commodity price risk. We could experience increased costs as a result of volatility in the market values of those commodities. We could also experience losses on our derivative contracts as a result of that market value volatility or if a counterparty fails to perform under a contract. In the absence of actively quoted market prices and pricing information from external sources, the valuation of these derivative contracts involves our exercise of judgment and use of estimates. As a result, changes in the underlying assumptions or use of alternative valuation methods could affect the reported fair value of these contracts.

We are exposed to interest rate risk.

We are exposed to interest rate risk on our variable rate financing. Borrowing levels under commercial paper arrangements vary from period to period depending upon capital investments and other factors. Such interest rate risk means that we are exposed to increased financing costs and associated cash payments as a result of changes in the short-term interest rates.

Interest rate movements and market performance affects our employee benefit plan costs.

Prevailing interest rates affect our assessment and determination of discount rates that are a key assumption in the determination of the costs and funding of our defined benefit pension plans and may impact the amount of expense and timing of contributions to those plans. The performance of the capital markets affects the values of the assets that are held in trust to satisfy the future obligations under our pension and postretirement benefit plans. We have significant obligations in these areas and hold significant assets in these trusts. A decline in the market value of those assets may increase our current and longer-term funding requirements for these obligations. Changes in the value of trust fund assets may affect the level of required contributions to these trusts to meet benefit obligations. Reduced benefit plan assets could result in increased benefit costs in future years and may increase the amount and accelerate the timing of required future funding contributions.

We are exposed to credit risk primarily through our regulated energy business.

Credit risk is the loss that may result from counterparty nonperformance. We face credit risk primarily through MGE's regulated energy business. Failure of contractual counterparties to perform their obligations under purchase power agreements, commodity supply arrangements or other agreements may result in increased expenses for MGE as a result of being forced to cover the shortfall in the spot or short-term market, where prices may be more volatile.

As a holding company, we are dependent on upstream cash flows from our subsidiaries for the payment of dividends on our common stock.

As a holding company, we have no operations of our own, and our ability to pay dividends on our common stock is dependent on the earnings and cash flows of our operating subsidiaries and their ability to pay upstream dividends or to repay funds to us. Prior to funding us, our subsidiaries have financial obligations that must be satisfied, including among others, debt service and obligations to trade creditors, and are subject to contractual and regulatory restrictions on the payment of dividends.

Disruptions in the financial markets or changes to our credit ratings may affect our ability to finance at a reasonable cost and in accordance with our planned schedule.

The credit markets have experienced disruption and uncertainty in recent years. To the extent that such issues affect the ability or willingness of credit providers or investors to participate in the credit markets or particular types of investments, or affect their perception of the risk associated with particular types of investments, our cost of borrowing could be affected. We also rely on our strong credit ratings to access the credit markets. If our credit ratings are downgraded for any reason, borrowing costs could increase, potential investors could decrease, or we could be required to provide additional credit assurance, including cash collateral, to contract counterparties.

General economic conditions may affect our operating revenues, our capital costs and our counterparty risks.

Operational

MGE Energy's and MGE's operations are affected by local, national and worldwide economic conditions. The consequences of a prolonged period of reduced economic activity may include lower demand for energy, uncertainty regarding energy prices and the capital and commodity markets, and increased credit risk. A decline in energy consumption may adversely affect our revenues and future growth. Increased credit risk reflects the risk that our retail customers will not pay their bills in a timely manner or at all, which may lead to a reduction in liquidity and an eventual increase in bad debt expense.

Liquidity

Long-term instability in the financial markets, as a result of recession or otherwise, also may affect the cost of capital and our ability to raise capital. Although MGE Energy and MGE believe they have sufficient liquidity despite the disruption of capital and credit markets, the costs of such funds may increase.

Counterparty creditworthiness

Credit risk also includes the risk that trading counterparties that owe us money or product will breach their obligations. MGE's risk management policy is to limit transactions to a group of high quality counterparties. Should the counterparties to these arrangements fail to perform, we may be forced to enter into alternative arrangements. In that event, our financial results could be adversely affected and we could incur losses.

Item 1B. Unresolved Staff Comments.

MGE Energy and MGE

None.

Item 2. Properties.

Electric Generation

Net summer rated capacity in service at December 31, 2012, was as follows:

(1)

Net summer rated capacity is determined by annual testing and may vary from year to year due to, among other things, the operating and physical conditions of the units.

(2)

Baseload generation.

(3)

MGE's 22% share of two 512-MW units. The other owners are WPL (a subsidiary of Alliant), which operates Columbia, and WPSC.

(4)

Facility is jointly owned. MGE Power West Campus owns a controlling interest in the electric generation plant and the UW owns a controlling interest in the chilled-water and steam plants. MGE leases the electric generating assets owned by MGE Power West Campus and is responsible for operating the facility. Amounts shown represent MGE's share of the net summer rated capacity. Based on the terms of the joint plant agreement between MGE and the UW, the UW has the ability to reduce net capability of these units by approximately 17 MW in the summer. The net summer rated capacity shown reflects this decrease.

(5)

MGE's 8.33% share in each of two 615 MW coal-fired generating units. The other owners are Wisconsin Energy Corporation, which operates the units, and WPPI Energy, Inc. MGE leases the electric generating assets owned by MGE Power Elm Road. Unit 1 and Unit 2 entered commercial operation in February 2010 and January 2011, respectively. Amounts shown represent MGE's share of the net summer rated capacity of the Units.

(6)

Three facilities are owned by MGE and three facilities are leased.

(7)

These facilities are owned by MGE.

(8)

Nameplate capacity rating is 11 MW.

(9)

Nameplate capacity rating is 30 MW.

Electric and Gas Distribution Facilities

Major electric distribution lines and substations in service at December 31, 2012, which are owned by MGE, are as follows:

Gas facilities include 2,466 miles of distribution mains, which are owned by MGE.

A significant portion of MGE's electric and gas distribution facilities are located above or underneath highways, streets, other public places or property that others own. MGE believes that it has satisfactory rights to use those places or property in the form of permits, grants, easements and licenses; however, it has not necessarily undertaken to examine the underlying title to the land upon which the rights rest.

Encumbrances

The principal plants and properties of MGE are subject to the lien of its Indenture of Mortgage and Deed of Trust dated as of January 1, 1946, as amended and supplemented, under which MGE's first mortgage bonds are issued. As of December 31, 2012, there were $1.2 million of first mortgage bonds outstanding. See Footnote 9 for additional information regarding MGE's first mortgage bonds.

MGE Power Elm Road has collaterally assigned its right to lease payments from MGE for the Elm Road Units in order to secure the repayment of $73.3 million of senior secured notes issued by MGE Power Elm Road. See Footnote 9 for additional information regarding these senior notes.

MGE Power West Campus has collaterally assigned its right to lease payments from MGE for the WCCF in order to secure the repayment of $50.0 million of senior secured notes issued by MGE Power West Campus. See Footnote 9 for additional information regarding these senior notes.

Item 3. Legal Proceedings.

MGE Energy and MGE

MGE Energy and its subsidiaries, including MGE, from time to time are involved in various legal proceedings that are handled and defended in the ordinary course of business.

See "Environmental" under Item 1, Business, and Footnote 18.e for a description of several environmental proceedings involving MGE. See Footnote 18.f for a description of other legal matters.

Item 4. Mine Safety Disclosures.

MGE Energy and MGE

Not applicable.

PART II.

Item 5. Market for Registrants' Common Equity, Related Stockholder Matters, and Issuer Purchases of Equity Securities.

Market for Common Equity

MGE Energy

MGE Energy common stock is traded on Nasdaq under the symbol MGEE. On February 1, 2013, there were approximately 36,421 shareholders of record. The following table shows high and low sale prices for the common stock on Nasdaq for each quarter over the past two years.

MGE

As of February 1, 2013, there were 17,347,894 outstanding shares of common stock, all of which were held by MGE Energy. There is no market for shares of common stock of MGE.

Dividends

MGE Energy

The following table sets forth MGE Energy's quarterly cash dividends per share declared during 2012 and 2011:

MGE

The following table sets forth MGE's quarterly cash dividends declared during 2012 and 2011:

See discussion below as well as the "Liquidity and Capital Resources - Financing Activities" under Item 7, Management's Discussion and Analysis of Financial Condition and Results of Operations, for a description of restrictions applicable to dividend payments by MGE.

Dividend Restrictions

Dividend payments by MGE to MGE Energy are subject to restrictions arising under a PSCW rate order and, to a lesser degree, MGE's first mortgage bonds. The PSCW order limits the amount of dividends that MGE may pay MGE Energy when its common equity ratio, calculated in the manner used in the rate proceeding, is less than 55%. Under those circumstances, MGE may not pay annual dividends in excess of $39.8 million plus dividends on MGE Energy shares issued in excess of the issued share number used in the rate proceeding forecast if the proceeds are invested in MGE. MGE's thirteen month rolling average common equity ratio at December 31, 2012, is 58.3%, as determined under the

calculation used in the rate proceeding. MGE paid cash dividends of $20.4 million to MGE Energy in 2012. The rate proceeding calculation includes as indebtedness imputed amounts for MGE's outstanding purchase power capacity payments and other PSCW adjustments, but does not include the indebtedness associated with MGE Power Elm Road and MGE Power West Campus, which are consolidated into MGE's financial statements but are not direct obligations of MGE.

MGE has covenanted with the holders of its first mortgage bonds not to declare or pay any dividend or make any other distribution on or purchase any shares of its common stock unless, after giving effect thereto, the aggregate amount of all such dividends and distributions and all amounts applied to such purchases, after December 31, 1945, shall not exceed the earned surplus (retained earnings) accumulated subsequent to December 31, 1945. As of December 31, 2012, approximately $281.6 million was available for the payment of dividends under this covenant.

Issuer Purchases of Equity Securities

MGE Energy

* Under the Stock Plan, common stock shares deliverable to plan participants may be either newly issued shares or shares purchased on the open market, as determined from time to time by MGE Energy. In June 2009, MGE Energy switched to using open market purchases to provide shares to meet obligations to participants in the Stock Plan. The shares are purchased on the open market through a securities broker-dealer and then are reissued under the Stock Plan as needed to meet share delivery requirements. The volume and timing of share repurchases in the open market depends upon the level of dividend reinvestment and optional share purchases being made from time to time by plan participants. As a result, there is no specified maximum number of shares to be repurchased and no specified termination date for the repurchases. All shares issued through the Stock Plan, whether newly issued or reissued following open market purchases, are issued and sold pursuant to a registration statement that was filed with the SEC and is currently effective.

MGE

None.

Stock Performance Graph

The performance graph below illustrates a five-year comparison of cumulative total returns based on an initial investment of $1,000 in MGE Energy common stock, as compared with the Russell 2000 and the EEI Index for the period 2008 through 2012. The EEI Index reflects the consolidated performance of Edison Electric Institute investor-owned electric utilities.

Value of Investment at December 31,

Item 6. Selected Financial Data.

MGE Energy

(In thousands, except per share amounts)

Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations.

General

MGE Energy is an investor-owned public utility holding company operating through subsidiaries in five business segments:

·

Regulated electric utility operations, conducted through MGE,

·

Regulated gas utility operations, conducted through MGE,

·

Nonregulated energy operations, conducted through MGE Power and its subsidiaries,

·

Transmission investments, representing our equity investment in ATC, and

·

All other, which includes corporate operations and services.

Our principal subsidiary is MGE, which generates and distributes electric energy, distributes natural gas, and represents a majority portion of our assets, liabilities, revenues, and expenses. MGE generates and distributes electricity to approximately 140,000 customers in Dane County, Wisconsin, including the city of Madison, and purchases and distributes natural gas to approximately 145,000 customers in the Wisconsin counties of Columbia, Crawford, Dane, Iowa, Juneau, Monroe, and Vernon.

Our nonregulated energy operations own interests in electric generating capacity that is leased to MGE. The ownership/leasing structure was adopted under applicable state regulatory guidelines for MGE's participation in these generation facilities, consisting principally of a stable return on the equity investment in the new generation facilities over the term of the related leases. The nonregulated energy operations include an ownership interest in two coal-fired generating units in Oak Creek, Wisconsin and a partial ownership of a cogeneration project on the UW-Madison campus. A third party operates the units in Oak Creek, and MGE operates the cogeneration project. Due to the nature of MGE's participation in these facilities, the results of our nonregulated operations are also consolidated into MGE's consolidated financial position and results of operations under applicable accounting standards.

Executive Overview

Our primary focus today and for the foreseeable future is our core utility customers at MGE as well as creating long-term value for our shareholders. MGE continues to face the challenge of providing its customers with reliable power at competitive prices. MGE meets this challenge by investing in more efficient generation projects, including renewable energy sources. In the future, MGE will continue to focus on growing earnings while controlling operating and fuel costs. MGE will continue to maintain safe and efficient operations in addition to providing customer value. We believe it is critical to maintain a strong credit standing consistent with financial strength in MGE as well as the parent company in order to accomplish these goals.

We earn our revenue and generate cash from operations by providing electric and natural gas utility services, including electric power generation and electric power and gas distribution. The earnings and cash flows from the utility business are sensitive to various external factors, including:

·

Weather, and its impact on customer sales of electricity and gas,

·

Economic conditions, including current business activity and employment and their impact on customer demand,

·

Regulation and regulatory issues, and their impact on the timing and recovery of costs,

·

Energy commodity prices,

·

Equity price risk pertaining to pension related assets,

·

Credit market conditions, including interest rates and our debt credit rating,

·

Environmental laws and regulations, including adopted and pending environmental rule changes,

·

Construction risk in connection with the Columbia environmental project,

and other factors listed in Item 1A. Risk Factors.

For the year ended December 31, 2012, MGE Energy's earnings were $64.4 million or $2.79 per share compared to $60.9 million or $2.64 per share for the same period in the prior year. MGE's earnings for the year ended December 31, 2012, were $40.8 million compared to $37.3 million for the same period in the prior year.

MGE Energy's income was derived from our business segments as follows:

Our net income during 2012 compared to 2011 primarily reflects the effects of the following factors:

·

A 4.7% increase in retail electric revenues, driven by increased residential customer demand primarily as a result of warmer-than-normal weather. Cooling degree days (a measure for determining the impact of weather during the cooling season) increased by 31% compared to the prior period.

·

A 5.5% decrease in gas sales reflecting lower customer demand due to a milder winter. Heating degree days (a measure for determining the impact of weather during the heating season) decreased by 15% compared to the prior period.

·

MGE has recognized $1.4 million (after tax) in AFUDC equity related to the Columbia environmental project for the year ended December 31, 2012.

Our net income during 2011 compared to 2010 primarily reflects the effects of the following factors:

·

A 3.0% increase in retail electric revenues due to increased customer demand.

·

A 3.0% increase in gas sales reflecting higher customer demand due to a colder winter. Heating degree days increased by 3% compared to the prior period.

·

The electric and gas utilities received a one-time $2.6 million (pretax) gain on a sale of property to ATC in March 2010.

·

Higher nonregulated energy revenues are attributable to both Elm Road Units being in commercial operation. Elm Road Unit 1 was placed in-service in February 2010, and Elm Road Unit 2 was placed in-service in January 2011.

During 2012, the following events occurred:

Columbia Environmental Project: In early 2011, the PSCW authorized the construction of air emission reduction systems and associated equipment on Columbia Units 1 and 2. MGE's estimated share of the capital expenditures required to complete this project is approximately $140 million. MGE expects to incur capital expenditures as follows: $68 million in 2013 and $12 million in 2014. As of December 31, 2012, MGE has accumulated $59.9 million (excluding carrying costs) related to its share of the project, which is reflected in the Construction Work in Progress balance on MGE Energy's and MGE's consolidated balance sheets. Of this amount, MGE has accumulated $55.6 million in 2012.

ATC: MGE Transco contributed $2.1 million for voluntary capital contributions to ATC for the year ended December 31, 2012.

Smart Grid Investment Grant: MGE was approved in 2010 by the U.S. Department of Energy (DOE) under the federal stimulus program for a $5.5 million grant for smart grid projects. The DOE grant requires MGE to match the grant funding, bringing the total cost of the projects to more than $11 million. The projects involve the installation of technologies to boost efficiency, enhance service and improve reliability for customers. The stimulus grant is being used to fund the following projects: advanced metering infrastructure, plug-in hybrid electric vehicles support, and distribution management. As of December 31, 2012, MGE has spent $8.4 million related to these projects and has outstanding agreements to purchase $1.3 million in smart grid related products for 2013.

During 2013, several items may affect us, including:

2013 Rate Filing: In December 2012, the PSCW authorized MGE to increase 2013 rates for retail electric customers by 3.8% and to increase rates for gas customers by 1.0%. The change in retail electric rates was driven by costs for new environmental equipment at Columbia, final construction costs for the Elm Road Units, transmission reliability enhancements, and purchased power costs.

In December 2012, as part of WEPCO's (the operator and primary owner of the Elm Road Units) 2013 Wisconsin rate case, the PSCW determined that 100% of the construction costs for the Elm Road Units were prudently incurred, and approved the recovery in rates of more than 99.5% of these costs. In addition, the PSCW deferred the final decision regarding the $1.8 million fuel flexibility project (MGE Power Elm Road's share) until a future rate proceeding.

Environmental Initiatives: There are proposed legislation, rules and initiatives involving matters related to air emissions, water effluent, hazardous materials and greenhouse gases, all of which affect generation plant capital expenditures and operating costs as well as future operational planning. Such legislation and rulemaking could significantly affect in particular the costs of owning and operating fossil-fueled generating plants, such as Columbia and the Elm Road Units, from which we derive approximately 43% of our electric generating capacity. We would expect to seek and receive recovery of any such costs in rates; however, it is difficult to estimate the amount of such costs due to the uncertainty as to the timing and form of the legislation and rules, and the scope and time of the recovery of costs in rates. In addition, MGE is involved in claims surrounding the alleged failure, among other things, to obtain necessary air permits and implement necessary emission controls associated with past activities at Columbia. MGE and the other co-owners are defending against these claims. See Columbia discussion in Footnote 18.e in Notes to Consolidated Financial Statements.

Columbia Environmental Project: During 2013, our share of the capital expenditures associated with the Columbia environmental project will be approximately $68 million. We intend to fund any remaining capital commitments with funds generated from normal operations, and the issuance of long-term and short-term debt.

General economic conditions: Economic conditions both inside and outside our service area are expected to continue to affect the level of demand for our utility services and may affect the collection of our accounts receivable and the creditworthiness of counterparties with whom we do business. We have in place lines of credit aggregating $115.0 million for MGE Energy (including MGE) and $75.0 million for MGE to address our liquidity needs.

The following discussion is based on the business segments as discussed in Footnote 23.

Results of Operations

Year Ended December 31, 2012, Versus the Year Ended December 31, 2011

Electric Utility Operations - MGE Energy and MGE

Electric sales and revenues

The following table compares MGE's electric revenues and electric kWh sales by customer class for each of the periods indicated:

Electric operating revenues increased $16.5 million or 4.4% for the year ended December 31, 2012, due to the following:

·

Rates changes. Rate changes have resulted in $19.0 million of additional revenue in 2012 compared to the same period in the prior year. The change is primarily a result of an electric retail rate increase which was authorized by the PSCW. Effective January 1, 2012, the retail rate increased 4.3% or $15.7 million for electric retail customers. The increase in electric rates was driven by MGE's electric fuel and purchased power costs, increased transmission costs, an update to the Elm Road Units' costs, and an increase for energy efficiency programs. Other factors also contributed to the revenue increase over the prior year, including customer mix (sales to various customer classes), demand charges, and customer fixed charges.

·

Volume. During the year ended December 31, 2012, there was a 0.3% decrease in total retail sales volumes compared to the same period in the prior year, reflecting decreased industrial customer demand, offset in part by an increase in residential demand.

·

Adjustments to revenues. The adjustments to revenues amount includes the elimination of carrying costs for Elm Road Units and WCCF that were collected in electric rates, which are recognized as nonregulated energy operating revenues in our Nonregulated Energy Operations segment.

·

Sales to the market. Sales to the market represent wholesale sales made to third parties who are not ultimate users of the electricity. These sales may include spot market transactions on the markets operated by MISO and PJM. These sales may also include bilateral sales to other utilities or power marketers.

Electric fuel and purchased power

The expense for fuel for electric generation decreased $4.3 million or 8.5% during the year ended December 31, 2012, compared to the same period in the prior year. Internal electric generation costs decreased $3.2 million as a result of a 6.3% decrease in the per-unit cost (largely due to lower natural gas prices), and lower generation volumes of 1.1% or $1.1 million.

Excluding the fuel rules adjustments discussed below, purchased power expense increased $3.6 million during the year ended December 31, 2012, compared to the same period in the prior year. This increase in expense reflects a $3.0 million or 4.7% increase in per-unit cost of purchased power and a $0.6 million or 0.9% increase in the volume of power purchased from third parties.

The PSCW adopted new fuel rules effective January 1, 2011, that require MGE to defer electric fuel-related costs that fall outside a 2% cost tolerance band around the amount used in the most recent rate proceeding. Any fuel rules adjustments are reflected in purchased power expense. During the year ended December 31, 2012, MGE's actual fuel costs fell below the lower end of this tolerance band, which resulted in MGE deferring $6.2 million in fuel-related cost savings to be returned to customers and increased purchased power costs. Any over/under recovery of the deferred costs is determined on an annual basis and adjusted in future billings to customers. After combining the fuel rules adjustments with the actual savings discussed above, purchased power expense increased $9.8 million ($6.2 million fuel rules difference plus the $3.6 million purchased power expense increase discussed above) during the year ended December 31, 2012, compared to the prior year.

Electric operating and maintenance expenses

Electric operating and maintenance expenses increased $4.7 million during the year ended December 31, 2012, compared to the same period in 2011. The following changes contributed to the net change:

For the year ended December 31, 2012, increased administrative and general costs are primarily due to increased pension costs, reflecting changes in the discount rate and assumptions regarding investment returns used in calculating such costs. Increased customer service costs are due to higher energy conservation spending. Increased transmission costs are due to higher transmission network costs. Production costs decreased primarily due to decreased costs at Columbia and Blount.

Electric depreciation expense

Electric depreciation expense decreased $2.3 million for the year ended December 31, 2012, compared to the same period in the prior year. This decrease is related to the retirement of Blount assets at the end of 2011 due to the switch from operating with coal to natural gas.

Gas Utility Operations - MGE Energy and MGE

Gas deliveries and revenues

The following table compares MGE's gas revenues and gas therms delivered by customer class during each of the periods indicated:

Gas revenues decreased $25.5 million or 15.5% for the year ended December 31, 2012. These changes are related to the following factors:

·

Gas costs/rates. The average retail rate per therm for the year ended December 31, 2012, decreased 11.4% compared to the same period in 2011, reflecting lower natural gas commodity costs.

·

Retail gas deliveries. For the year ended December 31, 2012, retail gas deliveries decreased 4.8% compared to the same period in 2011, as a result of milder weather during the winter months.

Cost of gas sold

For the year ended December 31, 2012, cost of gas sold decreased by $21.3 million, compared to the same period in the prior year. The cost per therm of natural gas decreased 17.2%, which resulted in $16.2 million of reduced expense. In addition, the volume of purchased gas decreased 5.1%, which resulted in $5.1 million of reduced expense.

Gas operating and maintenance expenses

Gas operating and maintenance expenses increased $2.4 million for the year ended December 31, 2012, compared to the same period in 2011. The following changes contributed to the net change.

For the year ended December 31, 2012, increased administrative and general costs were primarily due to increased pension costs, reflecting changes in the discount rate and assumptions regarding investment returns used in calculating such costs. Increased customer service costs are due to higher energy conservation spending.

Other Income (Deductions), Net - MGE Energy and MGE

For the year ended December 31, 2012, other income, net for the electric and gas segments increase by $1.4 million, compared to the same period in the prior year related to AFUDC equity recognized on the Columbia environmental project.

Nonregulated Energy Operations - MGE Energy and MGE

For the years ended December 31, 2012 and 2011, net income at the nonregulated energy operations segment was $18.1 million and $17.9 million, respectively. The nonregulated energy operations are conducted through MGE Energy's subsidiaries: MGE Power Elm Road and MGE Power West Campus. These subsidiaries have been formed to construct, own and lease electric generating capacity to assist MGE.

Transmission Investment Operations - MGE Energy and MGE

Transmission investment other income

For the years ended December 31, 2012 and 2011, other income at the transmission investment segment was $9.1 million and $8.6 million, respectively. The transmission investment segment holds our interest in ATC, and its income reflects our equity in the earnings of ATC. See Footnote 4.b for additional information concerning ATC and summarized financial information regarding ATC.

Consolidated Other General Taxes - MGE Energy and MGE

MGE Energy's and MGE's other general taxes increased $1.0 million or 5.9% for the year ended December 31, 2012, when compared to the same period in 2011, partially due to increased Wisconsin license fee tax. The annual license fee tax expense is based on the prior year's adjusted operating revenues. Tax rates have not changed.

Consolidated Income Taxes - MGE Energy and MGE

MGE Energy's effective income tax rate for the year ended December 31, 2012, was 37.7% compared to 37.1% for the same period in 2011, and MGE's effective income tax rate for the year ended December 31, 2012, was 37.7% compared to 37.0% for the same period in 2011. The effective income tax rate differences for both MGE Energy and MGE are primarily due to a lower estimated domestic manufacturing deduction.

For 2011 tax return purposes, MGE Energy and MGE changed their income tax method of accounting for electric transmission and distribution repairs and accounting for depreciation. The 2012 financial statement impact pertaining to finalization of the electric transmission and distribution repairs is an increase to deferred tax expense and a corresponding decrease in the current tax provision in the amount of $4.8 million. The 2012 financial statement impact pertaining to finalization of the depreciation adjustment is an increase to deferred tax expense and a corresponding decrease in the current tax provision in the amount of $38.6 million.

Noncontrolling Interest, Net of Tax - MGE

The noncontrolling interest, net of tax, reflects the accounting required for MGE Energy's interest in MGE Power Elm Road (the Elm Road Units) and MGE Power West Campus (WCCF). MGE Energy owns 100% of MGE Power Elm Road and MGE Power West Campus; however, due to the contractual agreements for these projects with MGE, the entities are considered VIEs and their results are consolidated with those of MGE, the primary beneficiary of the VIEs. Also included in noncontrolling interest, net of tax, is MGE Energy's interest in MGE Transco. The following table shows MGE Energy's noncontrolling interest, net of tax, reflected on MGE's consolidated statement of income:

Results of Operations

Year Ended December 31, 2011, Versus the Year Ended December 31, 2010

Electric Utility Operations - MGE Energy and MGE

Electric sales and revenues

The following table compares MGE's electric revenues and electric kWh sales by customer class for each of the periods indicated:

Electric operating revenues increased $15.1 million or 4.2% for the year ended December 31, 2011, due to the following:

·

Rates changes. Rates charged to retail customers for the year ended December 31, 2011, were 2.2% or $8.2 million higher than those charged during the same period in the prior year.

In January 2011, the PSCW authorized MGE to increase 2011 rates for retail electric customers by 2.3% or $8.0 million. The increase in retail electric rates is driven by costs for MGE's share of the Elm Road Units.

·

Adjustments to revenues. The adjustments to revenues amount includes the elimination of carrying costs for Elm Road Units and WCCF that were collected in electric rates, which are recognized as nonregulated energy operating revenues in our Nonregulated Energy Operations segment. The amount eliminated was $6.0 million and $7.0 million for the years ended December 31, 2011 and 2010, respectively.

During the year ended December 31, 2010, MGE recovered in electric rates the costs associated with the estimated commencement of lease payments for Elm Road Unit 2, which did not commence until the commercial operation of the Unit in 2011. These amounts were deferred on MGE's balance sheet. At December 31, 2010, $3.6 million was included in adjustments to revenues to defer these revenues and will be returned to customers in MGE's next base rate case.

·

Volume. During the year ended December 31, 2011, there was a 0.8% increase in total retail sales volumes compared to the same period in the prior year, reflecting increased commercial customer demand.

·

Sales to the market. Sales to the market represent wholesale sales made to third parties who are not ultimate users of the electricity. These sales may include spot market transactions on the markets operated by MISO or PJM. These sales may also include bilateral sales to other utilities or power marketers. Generating units are dispatched by MISO based on cost considerations as well as reliability of the system. Sales to the market typically occur when MGE has more generation and purchases online than is needed for its own system demand. The excess electricity is then sold to others in the market. For the year ended December 31, 2011, market volumes increased compared to the prior year, reflecting increased opportunities for sales, however, market settlement resulted in lower revenue per kWh for the year ended December 31, 2011, reflecting lower market prices. Also included in the sales to the market is a decrease in revenues pertaining to the ancillary services and capacity markets, which have no corresponding market volumes.

·

Other Revenues. Other revenues decreased a total of $0.3 million compared to the same period in the prior year.

Electric fuel and purchased power

The expense for fuel for electric generation increased $8.9 million or 21.2% during the year ended December 31, 2011, compared to the same period in the prior year, reflecting higher generation at the Elm Road Units. Elm Road Unit 1 and Unit 2 entered commercial operation in February 2010 and January 2011, respectively.

Purchased power expense decreased by $7.2 million or 10.0% during the year ended December 31, 2011, compared to the same period in the prior year. This decrease in expense reflects a $7.8 million or 10.9% decrease in the volume of power purchased from third parties, driven by Elm Road Unit 2 becoming operational in January 2011.

Electric operating and maintenance expenses

Electric operating and maintenance expenses increased $0.6 million during the year ended December 31, 2011, compared to the same period in 2010. The following changes contributed to the net change:

For the year ended December 31, 2011, increased production costs largely reflect increased maintenance at the Blount plant and increased production at the Elm Road Units. Increased distribution costs are primarily due to increased tree trimming expenses. These increases were partially offset by decreased transmission costs, primarily due to a decrease in network service fees pertaining to ATC.

Electric depreciation expense

Electric depreciation expense increased $0.8 million for the year ended December 31, 2011, compared to the same period in the prior year. This increase is related to higher levels of electric assets.

Gas Utility Operations - MGE Energy and MGE

Gas deliveries and revenues

The following table compares MGE's gas revenues and gas therms delivered by customer class during each of the periods indicated:

Gas revenues decreased $0.6 million or 0.4% for the year ended December 31, 2011. These changes are related to the following factors:

·

Gas costs/rates. The average retail rate per therm for the year ended December 31, 2011, decreased 4.2% compared to the same period in 2010. The primary contributor to this decrease is significantly lower natural gas commodity costs.

·

Retail gas deliveries. For the year ended December 31, 2011, retail gas deliveries increased 3.8% compared to the same period in 2010, reflecting colder weather during the winter months.

Cost of gas sold

For the year ended December 31, 2011, cost of gas sold decreased by $4.3 million, compared to the same period in the prior year. The cost per therm of natural gas decreased 7.4%, which resulted in $8.0 million of reduced expense. This decrease was partially offset by a 3.5% increase in the volume of gas purchased, which resulted in $3.7 million of increased expense.

Gas operating and maintenance expenses

Gas operating and maintenance expenses increased $1.1 million for the year ended December 31, 2011, compared to the same period a year ago. The following changes contributed to the net change.

For the year ended December 31, 2011, increased administrative and general costs were primarily due to increased use of outside services.

Gas depreciation expense

Gas depreciation expense increased $0.4 million for the year ended December 31, 2011, compared to the same period in the prior year. This increase is related to higher levels of gas assets.

Other Income (Deductions), Net - MGE Energy and MGE

For the year ended December 31, 2011, other income, net for the electric and gas segments decreased by $2.9 million, compared to the same period in the prior year. This decrease is primarily due to a one-time $2.6 million pretax gain on a sale of property to ATC during March 2010.

Nonregulated Energy Operations - MGE Energy and MGE