UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-K/A

(Amendment No. 1)

For the fiscal year ended December 31, 2011

OR

For the transition period from          to          

Commission file number 001-34691

ATLANTIC POWER CORPORATION

(Exact Name of Registrant as Specified in its Charter)

(617) 977-2400

(Registrant’s Telephone Number, Including Area Code)

Securities registered pursuant to Section 12(b) of the Act:

Securities registered pursuant to Section 12(g) of the Act: None

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.  Yes o No x

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.  Yes o No x

Indicate by check mark whether the registrant: (1) has 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 registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.  Yes x No o

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Website, 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 registrant was required to submit and post such files).  x Yes o 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 the registrant’s 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. o

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).  Yes o No x

As of June 30, 2011, the aggregate market value of the voting and nonvoting common equity held by non-affiliates of the registrant was $1.0 billion based upon the last reported sale price on the New York Stock Exchange. For purposes of the foregoing calculation only, all directors and executive officers of the registrant have been deemed affiliates.

As of February 24, 2012, 113,526,182 of the registrant’s Common Shares were outstanding.

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the registrant’s definitive Proxy Statement for its 2012 Annual Meeting of Shareholders, to be filed not later than 120 days after the end of the registrant’s fiscal year, are incorporated by reference into Items 10 through 14 of Part III of this Annual Report on Form 10-K.

Explanatory Note

This Amendment No. 1 to the Annual Report on Form 10-K of Atlantic Power Corporation (the “Company”) for the year ended December 31, 2011, is being filed for the purpose of providing separate financial statements of Chambers Cogeneration Limited Partnership (“Chambers”) in accordance with Rule 3-09 of Regulation S-X.  As indicated in the Company’s original Form 10-K for the year ended December 31, 2011, as filed with the Securities and Exchange Commission (the “SEC”) on February 29, 2012, Chambers is an equity method investee in which the Company owns a 40% interest.  As a non-accelerated filer, Chambers’ financial statements were not available until after the date the Company’s original Form 10-K was filed and, accordingly, the Company is filing the required Chambers’ financial statements with this Amendment No. 1.  Chambers is solely responsible for the form and content of the Chambers financial statements provided herewith.

As required by the rules of the SEC, this Amendment No. 1 sets forth an amended “Item 15. Exhibits and Financial Statement Schedules” in its entirety and includes the new certifications from the Company’s chief executive officer and chief financial officer.

Except as otherwise expressly noted herein, this Amendment No. 1 does not modify or update in any way the financial position, results of operations, cash flows, or other disclosures in, or exhibits to, the Company’s original Form 10-K as filed on February 29, 2012, nor does it reflect events occurring after the filing of the Company’s original Form 10-K.  Accordingly, this Amendment No. 1 should be read in conjunction with the Company’s original Form 10-K.

1

PART IV

ITEM 15.  EXHIBITS AND FINANCIAL STATEMENT SCHEDULES

(a)(1) Financial Statements:

The Company’s financial statements and supplementary information are listed in the “Index to Consolidated Financial Statements” appearing on page F-1 of the original Form 10-K, as filed with the SEC on February 29, 2012.

(a)(2) Financial Statement Schedules:

See “Index to Consolidated Financial Statements” appearing on page F-1 of the original Form 10-K, as filed with the SEC on February 29, 2012.

The following financial statement schedules are included in this Amendment No. 1 pursuant to Rule 3-09 of Regulation S-K:

Chambers Cogeneration Limited Partnership Financial Statements as of December 31, 2011 and 2010, and for each of the three years in the period ended December 31, 2011.

Schedules other than that listed have been omitted because of the absence of the conditions under which they are required or because the information required is shown in the consolidated financial statements or the notes thereto.

(a)(3)     Exhibits:

2

*                                         Filed herewith.

**                                  Furnished herewith.

(b) Exhibits:

See Item 15(a)(3) above.

(c) Financial Statement Schedules:

See Item 15(a)(2) above.

3

SIGNATURE

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

4

Chambers Cogeneration Limited Partnership Index

Index to Financial Statements

F-1

The consolidated financial statements of Chambers Cogeneration Limited Partnership and Subsidiary for the years ended December 31, 2011 and 2009, are presented herein without the related report of independent accountants.

F-2

CHAMBERS COGENERATION LIMITED PARTNERSHIP

Consolidated Financial Statements

December 31, 2011 and 2010

F-3

CHAMBERS COGENERATION LIMITED PARTNERSHIP

Consolidated Balance Sheets

December 31, 2011 and 2010

(Dollars in thousands)

See accompanying notes to consolidated financial statements.

F-4

CHAMBERS COGENERATION LIMITED PARTNERSHIP

Consolidated Statements of Operations

Years ended December 31, 2011 and 2010

(Dollars in thousands)

See accompanying notes to consolidated financial statements.

F-5

CHAMBERS COGENERATION LIMITED PARTNERSHIP

Consolidated Statements of Changes in Partners’ Capital and Comprehensive Income

Years ended December 31, 2011 and 2010

(Dollars in thousands)

See accompanying notes to consolidated financial statements.

F-6

CHAMBERS COGENERATION LIMITED PARTNERSHIP

Consolidated Statements of Cash Flows

Years ended December 31, 2011 and 2010

(Dollars in thousands)

See accompanying notes to consolidated financial statements.

F-7

CHAMBERS COGENERATION LIMITED PARTNERSHIP

Notes to Consolidated Financial Statements

December 31, 2011 and 2010

(1)                     Organization and Business

Chambers Cogeneration Limited Partnership (the Partnership) is a Delaware limited partnership formed on August 17, 1988. The general partners are Peregrine Power, LLC (Peregrine), a California limited liability company, and EIF/Carneys Point, LLC (EIF/Carneys), a Delaware limited liability company, who own 60% of the partnership collectively. As of December 31, 2011, EIF/Carneys and Peregrine were each wholly owned indirect subsidiaries of Calypso Energy Holdings, LLC (Calypso). The following entities, managed by EIF Management, LLC, collectively hold 100% of the partnership interests of Calypso:

Prior to May 2011, the 20% interest in Calypso was owned by Cogentrix Energy, LLC (CELLC). Epsilon Power (Epsilon), a wholly owned indirect subsidiary of Atlantic Power Corporation holds a 40% interest in the Partnership. In May 2010, Epsilon converted 39% of their 40% limited partnership interest to a general partnership interest.

The Partnership was formed to construct, own and operate a 262-megawatt (MW) coal-fired cogeneration station (the Facility) at DuPont’s Chambers Works chemical complex in Carneys Point, New Jersey. The Facility produces energy for sale to Atlantic City Electric Company (AE), and energy and process steam to E.I. DuPont de Nemours & Company (DuPont) for use in its industrial operations. The Facility achieved final completion and commercial operations in 1994.

The net income and losses of the Partnership are allocated to Peregrine, EIF/Carneys and Epsilon (collectively, the Partners) based on the following ownership percentages:

All distributions other than liquidating distributions are made based on the Partners’ percentage interests, as shown above, in accordance with the Partnership documents and at such times and in such amounts as the Board of Control of the Partnership determines.

Carneys Point Generating Company, L.P.

The Partnership has a lease agreement with Carneys Point Generating Company, L.P. (CPGC), which is equally owned by Topaz Power, LLC (Topaz) and by Garnet Power, LLC (Garnet), both of which are wholly owned direct subsidiaries of Calypso. CPGC leases the facility and subleases the site from the Partnership. In addition, certain contracts and agreements related to the Partnership have been assigned to CPGC by the Partnership. The lease commenced on September 20, 1994 and has a 24-year term. CPGC’s operations have been established to effectively break-even under the lease agreement.

(Continued)

F-8

CHAMBERS COGENERATION LIMITED PARTNERSHIP

Notes to Consolidated Financial Statements

December 31, 2011 and 2010

(2)                     Summary of Significant Accounting Policies

(a)                      Basis of Presentation

On January 1, 2010, the Partnership adopted an accounting standards update that changes when and how to determine, or re-determine, whether an entity is a variable interest entity (VIE), which could require consolidation. In addition, the accounting standards update replaces the quantitative approach for determining who has a controlling financial interest in a VIE with a qualitative approach and requires ongoing assessments of whether an entity is the primary beneficiary of a VIE.

The Partnership is required to consolidate any entities that they control. In most cases, control can be determined based on majority ownership or voting interests. However, for certain entities, control is difficult to discern based on ownership or voting interests alone. These entities are referred to as VIE’s. A VIE is an entity that does not have sufficient equity at risk to finance its activities without additional subordinated financial support from other parties, or whose equity investors lack any characteristics of a controlling financial interest. An enterprise has a controlling financial interest if it has the obligation to absorb expected losses or receive expected gains that could potentially be significant to a VIE and the power to direct activities that are most significant to a VIE’s economic performance. An enterprise that has a controlling financial interest is known as the VIE’s primary beneficiary and is required to consolidate the VIE. The Partnership reassesses its determination of whether the Partnership is the primary beneficiary of a VIE at each reporting date or if there are changes in facts and circumstances that could potentially alter the Partnership’s assessment.

The Partnership has determined that CPGC is a VIE of the Partnership primarily due to its lease arrangements with CPGC. The Partnership has determined that it is the primary beneficiary of the VIE and therefore the Partnership consolidates CPGC in its financial statements. All material intercompany transactions have been eliminated.

(b)                      Use of Estimates

The preparation of consolidated financial statements in conformity with accounting principles generally accepted in the United States of America (GAAP) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent liabilities as of the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

(c)                       Cash and Cash Equivalents

Cash and cash equivalents consist of short-term, highly liquid investments with original maturities of three months or less.

(d)                      Restricted Cash

Restricted cash includes both cash and cash equivalents that are held in accounts restricted for debt service, major maintenance and other specifically designated accounts under a disbursement agreement. Restricted cash associated with transactions expected to occur beyond one-year are classified as long-term. All restricted accounts are classified as current assets.

(Continued)

F-9

CHAMBERS COGENERATION LIMITED PARTNERSHIP

Notes to Consolidated Financial Statements

December 31, 2011 and 2010

(e)                       Inventory

Fuel is valued using the average cost method and includes the fuel contract purchase price as well as the transportation and related costs incurred to deliver the fuel to the Facility (note 3).

Spare parts are recorded at the lower of average cost or market and consist of Facility equipment components and supplies required to facilitate maintenance activities. Spare parts are classified as current in the accompanying consolidated balance sheets (note 3).

The Partnership performs periodic assessments to determine the existence of obsolete, slow-moving and unusable inventory and records necessary provisions to reduce such inventories to market.

(f)                         Emission Allowances

Emission allowances are valued under the weighted average costing method subject to the lower of cost or market principle. In applying the lower of cost or market principle, a reduction in the carrying value is not recognized so long as the Partnership will recover/pass-through the cost in its operating margin.

The historical cost of emission allowances is calculated as follows:

·                              Granted from regulatory body-emission allowances obtained via grants are not assigned any value by the Partnership as their cost is zero.

·                              Acquired as part of an acquisition-emission allowances are recorded at fair value as of the acquisition date, subject to pro rata reduction if overall purchase price is less than the entity’s fair value.

·                              Purchased from third parties-emission allowances that are transferable and can be purchased or sold in the normal course of business are recorded at cost.

As of December 31, 2011 the partnership has accrued approximately $91,000 in emission allowances which are classified as current and included in accrued liabilities in the accompanying consolidated balance sheets.

(g)                      Derivative Contracts

In accordance with guidance on accounting for derivative instruments and hedging activities all derivatives should be recognized at fair value. Derivatives or any portion thereof, that are not designated as, and effective as, hedges must be adjusted to fair value through earnings. Derivative contracts are classified as either assets or liabilities on the consolidated balance sheets. Certain contracts that require physical delivery may qualify for and be designated as normal purchases/normal sales. Such contracts are accounted for on an accrual basis. The Partnership’s interest rate swap agreement (note 8), power purchase agreement (PPA) (note 10) and power sales agreement (PSA) (note 10) meet the definition of a derivative. The Partnership’s PPA qualifies for, and the Partnership has elected, the normal purchases and normal sales exception and accordingly accounts for the PPA on an accrual basis. The Partnership’s PSA is marked to market through earnings.

(Continued)

F-10

CHAMBERS COGENERATION LIMITED PARTNERSHIP

Notes to Consolidated Financial Statements

December 31, 2011 and 2010

The Partnership engages in activities to manage risks associated with changes in interest rates. The Partnership has entered into swap agreements to reduce exposure to interest rate fluctuations on certain debt commitments (note 5). These agreements were designated and qualified as cash flow hedging instruments through December 31, 2004. The Partnership discontinued applying cash flow hedge accounting on January 1, 2005. The balance of accumulated other comprehensive loss, as of December 31, 2004, is amortized as interest expense in the accompanying consolidated statements of operations in accordance with the originally forecasted interest payments schedule through the expiration of the interest rate swaps on March 31, 2014.

(h)                      Fair Value Measurements

The Partnership uses a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (level 1 measurements) and the lowest priority to unobservable inputs (level 3 measurements). The three levels of the fair value hierarchy are described below:

·                              Level 1: Observable inputs such as quoted prices (unadjusted) in active markets for identical assets or liabilities.

·                              Level 2: Inputs other than quoted prices that are observable for the asset or liability, either directly or indirectly. These include quoted prices for similar assets or liabilities in active markets and quoted prices for identical or similar assets or liabilities in markets that are not active.

·                              Level 3: Unobservable inputs that reflect the reporting entity’s own assumptions.

A financial instrument’s level within the fair value hierarchy is based on the lowest level of any input that is significant to the fair value measurement (note 8). As of December 31, 2011 and 2010, the Partnership does not have any nonfinancial assets or liabilities remeasured at fair value on a recurring basis.

(i)                         Property and Equipment

Property and equipment are recorded at cost, net of accumulated depreciation. Expenditures for major additions and improvements are capitalized and minor replacements, maintenance, and repairs are charged to expense as incurred. When property and equipment are retired or otherwise disposed of, the cost and accumulated depreciation are removed from the accounts and any resulting gain or loss is included in the results of operations for the respective period. Depreciation is provided over the lease term of the land using the straight-line method (note 4).

The Partnership’s depreciation is based on the Facility being considered a single property unit. Certain components within the Facility will require replacement or overhaul several times over its estimated life. Costs associated with overhauls are recorded as an expense in the period incurred. However, in instances where a replacement of a Facility component is significant and the Partnership can reasonably estimate the original cost of the component being replaced, the Partnership will write-off the replaced component and capitalize the cost of the replacement. The component will be

(Continued)

F-11

CHAMBERS COGENERATION LIMITED PARTNERSHIP

Notes to Consolidated Financial Statements

December 31, 2011 and 2010

depreciated over the lesser of the EUL of the component or the remaining useful life of the Facility and also the lease term, when the component is a capitalized modification to leased property.

The Partnership reviews the carrying value of property and equipment for impairment whenever events and circumstances indicate that the carrying value of an asset may not be recoverable from the estimated future cash flows expected to result from its use and eventual disposition. In cases where undiscounted expected future cash flows are less than the carrying value, an impairment loss is recognized equal to an amount by which the carrying value exceeds the fair value of assets. The factors considered by management in performing this assessment include current operating results, trends and prospects, the manner in which the property is used, and the effects of obsolescence, demand, competition, and other economic factors.

(j)                         Deferred Financing Costs

Deferred financing costs, which consist of the costs incurred to obtain financing, are deferred and amortized into interest expense in the accompanying consolidated statements of operations using the effective interest method over the term of the related financing (note 5).

(k)                      Asset Retirement Obligations

Asset retirement obligations, including those conditioned on future events, are recorded at fair value in the period in which they are incurred, if a reasonable estimate of fair value can be made. The associated asset retirement costs are capitalized as part of the carrying amount of the related long-lived asset in the same period. In each subsequent period, the liability is accreted to its present value and the capitalized cost is depreciated over the EUL of the long-lived asset. If the asset retirement obligation is settled for other than the carrying amount of the liability, the Partnership recognizes a gain or loss on settlement. The Partnership recognized an asset retirement obligation at December 31, 2011 and 2010 of approximately $10,943,000 and $10,357,000, respectively. This obligation represents the weighted average probability of costs the Partnership would incur to perform environmental clean-up and remove or sell the facility.

(l)                         Income Taxes

As partnerships, the income tax effects attributable to Chambers Cogeneration Partnership Limited accrue directly to the partners. Each partner is individually responsible for its share of the respective Partnerships’ and CPCG taxable income or loss.

In addition, during 2010 and 2011, there were no unrecognized tax benefits, current income taxes or penalties and interest related to income taxes recognized in the consolidated statements of operations or the consolidated statements of financial position.  If interest or penalties were incurred, they would be recognized in income tax expense in the accompanying consolidated statements of operations.

The tax years that remain subject to examination are December 31, 2008 through December 31, 2011.

(Continued)

F-12

CHAMBERS COGENERATION LIMITED PARTNERSHIP

Notes to Consolidated Financial Statements

December 31, 2011 and 2010

(m)                   Revenue Recognition

Revenues from the sale of energy and steam are recorded based on monthly output delivered as specified under contractual terms or current market conditions and are recorded on a gross basis on the accompanying consolidated statements of operations as energy and steam revenues, respectively, with the associated costs recorded in operating expenses.

(n)                      Reclassifications

Certain reclassifications have been made to the prior year’s consolidated financial statements to conform to the current year presentation. These reclassifications had no effect on the previously reported results of operations or partners’ capital.

(o)                      Subsequent Events

The Partnership evaluated subsequent events through March 30, 2012.

(3)                     Inventory

Inventory consisted of the following as of December 31:

(4)                     Property and Equipment

Property and equipment consisted of the following components as of December 31:

(Continued)

F-13

CHAMBERS COGENERATION LIMITED PARTNERSHIP

Notes to Consolidated Financial Statements

December 31, 2011 and 2010

The EUL for significant property and equipment categories are as follows:

(5)                     Long-Term Debt

Long-term debt consisted of the following as of December 31(In thousands of dollars):

(Continued)

F-14

CHAMBERS COGENERATION LIMITED PARTNERSHIP

Notes to Consolidated Financial Statements

December 31, 2011 and 2010

(1)                      The bonds are collateralized by an irrevocable letter of credit and provide for interest at variable rates. The weighted average interest rates on the bonds were 1.58% and 0.36% for the years ended December 31, 2011 and 2010, respectively. Remarketing fees paid to the remarketing agent were approximately $100,000 in both 2011 and 2010. These fees are included in interest expense in the accompanying consolidated statements of operations.

(2)                      Loan payable is collateralized by equipment. The term is 60-months commencing July 2011 with interest fixed at 5.69%.

(3)                      The term loans accrue interest at the applicable London Interbank Offered Rate (L1BOR), plus an applicable margin (1.25% at December 31, 2011 and December 31, 2010). The weighted average interest rates on the term loan were 1.58% and 1.62% for 2011 and 2010, respectively.

(4)                      The letter of credit fee for 2011 and 2010 was 1.25%. In addition, the facility provides for a fronting fee of 0.30% effective August 12, 2011 (previously 0.175%) on the stated amount which is included in interest expense in the accompanying consolidated statements of operations.

(5)                      The letter of credit fee for 2011 through December 19 and 2010 was 1.50%. In addition, the facility provided for a fronting fee of 0.175% on the stated amount which is included in interest expense in the accompanying consolidated statements of operations.

(6)                      All bonds, loans and credit facilities are collateralized by the assets of the Facility and the real estate covered by the ground lease (note 1) and are nonrecourse to the Partners.

(7)                      As of December 31, 2011 and 2010, there were no amounts drawn under the letter of credit commitments.

(8)                     On December 15, 2011, EIF Calypso, LLC, EIF United States Power Fund IV, LP, and Atlantic Power Corporation posted acceptable replacement security letters of credit totaling $22,750,000 replacing the previous debt service reserve letter of credit. The replacement letters of credit each expire on December 15, 2012 with an automatic one (1) year extension unless the issuing bank(s) give 90 days written notification.

(9)                      As of December 31, 2011, there were no amounts drawn on the DSR letter of credit.

Accrued interest payable of $17,000 and $3,000 is included in accrued liabilities in the consolidated balance sheets as of December 31, 2011 and 2010, respectively.

(Continued)

F-15

CHAMBERS COGENERATION LIMITED PARTNERSHIP

Notes to Consolidated Financial Statements

December 31, 2011 and 2010

Future minimum principal payments as of December 31, 2011 are as follows (dollars in thousands):

In connection with the various agreements discussed above, certain financial covenants must be met and reported on an annual basis.  The Partnership was in compliance with all debt covenants at December 31, 2011 with the exception of two, for which the Partnership has obtained a waiver for one violation and is expected to cure the second violation within the designated cure period.

Interest Rate Swap Agreements

The Partnership is a party to one amortizing interest rate swap agreement with an outstanding notional amount of $59,376,000 at December 31, 2011 and expiring on various dates through March 31, 2014. Swap payments related to the agreements covering the variable rate bank debt are made based on the spread between 6.18% (weighted average of the outstanding agreement as of December 31, 2011) and LIBOR multiplied by the notional amounts outstanding. Net amounts paid to the counterparties were approximately $4,569,000 and $6,170,000 in 2011 and 2010, respectively. These amounts were recorded as interest expense in the accompanying consolidated statements of operations.

(6)                     Operating Leases

The Partnership leases certain equipment, land and buildings under noncancelable operating leases expiring at various dates through 2024. For the years ended December 31, 2011 and 2010, the Partnership incurred lease expense of approximately $205,000 and $208,000, respectively, which is included in operations and maintenance expense and general and administrative expense in the accompanying consolidated statements of operations.

Future minimum lease payments, as of December 31, 2011, are as follows (dollars in thousands):

(Continued)

F-16

CHAMBERS COGENERATION LIMITED PARTNERSHIP

Notes to Consolidated Financial Statements

December 31, 2011 and 2010

(7)                     Payment in Lieu of Taxes

In January 1991, the Partnership entered into a Payment in Lieu of Taxes (PILOT) agreement with the Township of Carneys Point, a municipal corporation of the state of New Jersey, which exempts the Partnership from certain property taxes. The agreement commenced on January 1, 1994, and will terminate on December 31, 2033. PILOT payments are paid annually and are expensed on a straight-line basis as incurred over the term of the agreement. Property taxes are due and paid quarterly and are deducted from the annual PILOT payments made. The Partnership expensed approximately $2,800,000 and $2,700,000 related to the PILOT which is included in general and administrative in the accompanying consolidated statements of operations for the years ended December 31, 2011 and 2010, respectively.

As of December 31, 2011, future payments remaining under the PILOT are as follows (dollars in thousands):

(8)                     Fair Value of Financial Instruments

The Partnership’s swap agreements and PSA are accounted for as derivative contracts (note 2). The Partnership uses a valuation model to derive the fair value of its derivative contracts based upon the present value of known or estimated cash flows taking into consideration multiple inputs including contractual terms of the swap agreements and PSA, observable market based inputs when available, interest rate curves, and counterparty credit risk. The models used reflect the contractual terms of, and specific risks inherent in, the contracts as well as the availability of pricing information in the market. Where possible, the Partnership verifies the values produced by its pricing model to market transactions. Due to the fact that the Partnership’s PSA contract trades in less liquid markets, model selection requires significant judgment because such contracts tend to be more complex and pricing information is less available in these markets. Price transparency is inherently more limited for more complex structures because of the nature, location and tenor of the arrangement, which requires additional inputs such as correlations and volatilities. In addition to model selection, management makes significant judgments based upon the Partnership’s proprietary views of market factors and conditions regarding price and correlation inputs in unobservable periods and adjustments to reflect various factors such as liquidity, bid/offer spreads and credit considerations. If available, these adjustments are based on market evidence.

The Partnership adjusts the inputs to its valuation models only to the extent that changes in these inputs can be verified by similar market transactions, third-party pricing services and/or broker quotes, or can be derived from other substantive evidence such as empirical market data. In circumstances where the Partnership cannot verify the models to market transactions, it is possible that a different valuation model could produce a materially different estimate of fair value.

(Continued)

F-17

CHAMBERS COGENERATION LIMITED PARTNERSHIP

Notes to Consolidated Financial Statements

December 31, 2011 and 2010

The following table sets forth the Partnership’s financial assets and liabilities and other fair value measurements made on a recurring basis by fair value hierarchy level at December 31, 2011:

The following table sets forth a reconciliation of changes in the fair value of derivatives that are based on significant unobservable inputs for the year ended December 31, 2011 (dollars in thousands).

(Continued)

F-18

CHAMBERS COGENERATION LIMITED PARTNERSHIP

Notes to Consolidated Financial Statements

December 31, 2011 and 2010

The following table sets forth the Partnership’s financial assets and liabilities and other fair value measurements made on a recurring basis by fair value hierarchy level at December 31, 2010:

The following table sets forth a reconciliation of changes in the fair value of derivatives that are based on significant unobservable inputs for the year ended December 31, 2010 (dollars in thousands).

(1)                     Unrealized gain on the interest swap is recognized in operating expenses in the consolidated statements of operations for the years ended December 31, 2010 and 2011. Unrealized loss on the PSA is recognized in revenue in the consolidated statement of operations for the year ended December 31, 2011. Each of the contracts contributing to the unrealized gain, net was still held by the Partnership at December 31, 2011.

The Partnership’s additional financial instruments consist of cash and cash equivalents, restricted cash, accounts receivable, other assets, accounts payable, due to affiliates, and accrued liabilities. These instruments approximate their fair values as of December 31, 2011 and 2010 due to their short-term nature.

The fair value of the Partnership’s bonds and long term loans payable approximates their carrying value due to the variable nature of the interest obligations thereon.

(Continued)

F-19

CHAMBERS COGENERATION LIMITED PARTNERSHIP

Notes to Consolidated Financial Statements

December 31, 2011 and 2010

(9)                     Concentrations of Credit Risk

Credit risk is the risk of loss the Partnership would incur if counterparties fail to perform their contractual obligations. The Partnership primarily conducts business with counterparties in the energy industry. This concentration of counterparties may impact the Partnership’s overall exposure to credit risk in that its counterparties may be similarly affected by changes in economic, regulatory or other conditions. The Partnership mitigates potential credit losses by dealing, where practical, with counterparties that are rated investment grade by a major credit rating agency or have a history of reliable performance within the energy industry.

The Partnership’s credit risk is primarily concentrated with AE and DuPont. AE and DuPont provided 76% and 24%, respectively, of the Partnership’s revenues for the year ended December 31, 2011 and accounted for approximately 72% and 28%, respectively, of the Partnership’s trade accounts receivable balance at December 31, 2011. The Partnership has a coal supply contract with Consolidated Coal Company, Consolidated Pennsylvania Coal Company, Consolidated Coal Sales Company and Nineveh Coal Company (together Consol) who are responsible for providing 100% of the Partnership’s coal requirements through 2014. The Partnership’s credit risk is also impacted by the credit risk associated with its issuing bank of the bond letter of credit, BNP Paribas (previously Dexia Credit Locale).

The Partnership is exposed to credit-related losses in the event of nonperformance by counterparties to the Partnership’s interest rate swap agreements (notes 2 and 5). The Partnership does not obtain collateral or other security to support such agreements, but continually monitors its positions with, and the credit quality of, the counterparties to such agreements.

(10)              Commitments and Contingencies

(a)                      Power Purchase Agreement

The Partnership has a power purchase agreement (PPA) with AE for sales of the Facility’s power output during a 30-year period commencing in 1994. The PPA provides AE with dispatch rights over the Facility, with a contractual minimum of the equivalent of 3,500 hours of full load operation. The pricing structure provides for both capacity and energy payments. Capacity payments are fixed over the life of the contract. Energy payments are based on a contractual formula which is adjusted annually, as defined in the PPA, based on a utility coal index.

(b)                      Power Sales Agreement

The Partnership has entered into a supplemental power sales agreement (PSA) with AE which provides the Partnership self-dispatch rights for both undispatched PPA and excess energy as well as the right to market excess capacity. The pricing structure provides for both capacity and energy payments. The Partnership shares margins on the self-dispatched energy with AE based on hourly wholesale prices. Excess capacity is sold in PJM’s periodic auctions and the resulting revenue is shared between the Partnership and AE. The PSA expired on December 31, 2011. The Partnership has entered into a new PSA with AE in December 2011 that commences January 1, 2012 and expires on December 31, 2012.

(Continued)

F-20

CHAMBERS COGENERATION LIMITED PARTNERSHIP

Notes to Consolidated Financial Statements

December 31, 2011 and 2010

(c)                       Steam and Electricity Sales Agreement

The Partnership has a steam and electricity sales agreement with DuPont (the DuPont Agreement) for a 30-year period commencing in 1994. Thereafter, the agreement will remain in effect unless terminated by either party upon at least 36-months’ notice. DuPont is required to purchase a minimum of 525,600,000 pounds of process steam per year and no minimum amount of electricity. The steam price is adjusted quarterly based on coal price index formulas defined in the agreement. The electricity price is also adjusted quarterly based on coal price index formulas and the AE average retail rate, as defined in the agreement. The Partnership has ongoing litigation with DuPont over the electric energy payment calculation. Amounts under dispute have not been reflected in revenues in the accompanying consolidated statements of operations.

(d)                      Fly Ash Disposal Agreement

As of November 1, 2011, the Partnership entered into an Ash Management Services Agreement (Ash Agreement) with HEI of PA, Inc. (HEI) for disposal of a minimum of 50,000 tons per calendar year (prorated for any partial year) of bottom ash and fly ash, including pugged ash and dry ash generated or produced at the facility. The contract has an initial term of ten (10) years commencing November 1, 2011 with three (3) additional five (5) year period automatic extensions unless either party gives written notice of nonextension to the other party twelve (12) months prior to the expiration of the then current term. Disposal pricing is adjusted annually, as defined in the Ash Agreement, beginning on the third anniversary date.

(e)                       Reverse Osmosis Boiler Feed Water System

In 2011, the Partnership entered into a capital lease agreement with Wells Fargo Equipment Finance, Inc (Wells Fargo) to lease a Reverse Osmosis Boiler Feed Water System (RO) that was designed, fabricated, and installed by Western Reserve Water Systems. The capital lease is for a term of 60 months commencing in July 2011. At the end of the lease term, the Partnership will have the option to purchase the RO for $1.

(f)                         Other

The Partnership experiences routine litigation in the normal course of business. Management is of the opinion that none of this routine litigation will have a material adverse effect on the Partnership’s consolidated financial position or results of operations.

(11)             Related Parties

(a)                      Operations and Maintenance Agreement

The Partnership is party to an Operations and Maintenance Agreement (O&M Agreement) with US Operating Services Company, LLC (USOSC), a wholly owned subsidiary of Calypso, for the operation and maintenance (O&M) of the Carneys Point Project. During the third quarter 2010, ownership of USOSC was acquired by Calypso from CELLC. The O&M Agreement expires on April 1, 2014. Thereafter, the O&M agreement will be automatically renewed for periods of five-years, until terminated by either party with 12-months prior notice. Compensation to OSC under the agreement includes (i) an annual base fee, of which a portion is subordinate to debt service and certain other costs, (ii) certain earned fees and bonuses based on the Facility’s performance and (iii)

(Continued)

F-21

CHAMBERS COGENERATION LIMITED PARTNERSHIP

Notes to Consolidated Financial Statements

December 31, 2011 and 2010

reimbursement for certain costs, including payroll, supplies, spare parts, equipment, certain taxes, licensing fees, insurance and indirect costs expressed as a percentage of payroll and personnel costs. The fees are adjusted annually by a measure of inflation as defined in the agreement. If targeted Facility performance is not reached on a monthly basis, OSC may be required to pay liquidated damages to the Partnership. The Partnership incurred related expense of approximately $10,479,000 and $9,771,000 which is recorded in operations and maintenance in the consolidated statements of operations during the years ended December 31, 2011 and 2010, respectively. As of December 31, 2011 and 2010, the Partnership owed OSC $1,712,000 and $1,844,000, respectively, under the O&M Agreement, which is included in due to affiliates in the accompanying consolidated balance sheets. Under the terms of the agreement, approximately $560,000 and $350,000 of the amounts owed at December 31, 2011 and 2010, respectively, is subordinate to the debt service for the Partnership’s bonds payable and term loans.

USOSC is party to a Technical Services Agreement (TSA) with Power Services Company, LLC (PSC), a wholly owned subsidiary of Calypso, for services to assist in the day-to-day O&M of the Carneys Point Project. During the third quarter 2010, ownership of PSC was acquired by Calypso from CELLC.

PSC and NAES Corporation (NAES), an independent third-party O&M provider, are parties to a subcontract (NAES Agreement) for NAES to perform all tasks commercially and reasonably necessary to operate, maintain and manage the Company, including administering, managing, monitoring, and performing all of USOSC’s obligations and responsibilities of the O&M agreement between USOSC and the Partnership. The NAES agreement expires on August 23, 2015.

(b)                      Management Services Agreement

The Partnership has a Management Services Agreement (MSA) with PSC to provide day-to-day management and administration services to the Carneys Point Project through September 20, 2018. PSC and Power Plant Management Services, LLC (PPMS), an independent third party management services provider, are parties to a subcontract formalized under a Project Management and Administrative Services Agreement (PMAS) for the Carneys Point Project. The initial term of the PMAS agreement expires on August 23, 2015. The initial term automatically extends for successive two year periods or, if the Facility MSA is scheduled to terminate or expire pursuant to its own terms prior to the expiration of any two year period, a shorter period equal to the time remaining under the Facility MSA unless either party notifies the other party at least three months prior to expiration of the then existing term. Under the PMAS, PPMS provides overall project management, administrative, and related support services as may be necessary to the Partnership and oversees the execution of the NAES agreement on behalf of the Partnership. Compensation to PSC under the agreement includes a monthly fee of $50,000, and PMAS pass-through costs. Payments to PSC of $1,292,000 and $1,731,000 are included in operations and maintenance in the consolidated statements of operations in 2011 and 2010, respectively. As of December 31, 2011 and 2010, the Partnership owed PSC approximately $50,000 for each of 2011 and 2010, which is included in due to affiliates in the accompanying consolidated balance sheets and is subordinate to debt service for the Partnership’s bonds payable and term loans.

(Continued)

F-22

CHAMBERS COGENERATION LIMITED PARTNERSHIP

Notes to Consolidated Financial Statements

December 31, 2011 and 2010

(12)              Restatement of Previously Issued Financial Statements

Following a review of its accounting policies, the Partnership determined that it had incorrectly calculated depreciation expense of the Facility. The Partnership has a ground lease for the Facility with a term of 30 years from the start of the lease with no renewal options. The lease term began with the commencement of commercial operations of the Facility in 1994. The Partnership had been depreciating the Facility over an EUL of 60 years. The Partnership should have been depreciating the Facility over the lesser of its EUL or the term of the ground lease. Therefore, the Partnership understated previously reported depreciation expense and overstated the carrying value of its property and equipment. Additionally, the Partnership determined that it had incorrectly calculated its estimate of the fair value of asset retirement obligations and related accretion and depreciation expense. As a result, the Partnership restated its financial statements for the years ended December 31, 2010 and 2009. These non-cash adjustments had no material impact on the Partnership’s previously reported cash flows, cash position or revenues in any period, or on the Partnership’s compliance with any of its debt covenants.

(Continued)

F-23

CHAMBERS COGENERATION LIMITED PARTNERSHIP

Notes to Consolidated Financial Statements

December 31, 2011 and 2010

The impact of the corrections to 2010 previously issued financial statements is as follows: