Atlantic Power Corporation Announces Strong First Quarter 2007 Results

BOSTON, MASSACHUSETTS--(CCNMatthews - May 15, 2007) - Atlantic Power Corporation (TSX: ATP.UN)(TSX:ATP.DB) (the "Company") today announced its results for the three months ended March 31, 2007. All amounts are in US dollars unless otherwise indicated.

Highlights:

- Adjusted Project EBITDA up 24% vs. last year period

- Cash flow available for distribution increased to $20.8 million vs. $10.2 million in the first quarter 2006

- New three-year agreement at Rumford extends project's cash flow profile

"We are very pleased with our strong financial and operating performance in the quarter," commented Barry Welch, President and CEO. "Going forward we will continue to execute our strategy to extend expiring power purchase agreements at our projects to support and grow our future cash flows."

Extending Power Purchase Agreements

The Company continued its strategy to mitigate risk by extending the duration of its projects' contracted cash flows. During 2006 the Rumford project operated under an interim market-based power purchase agreement ("PPA"). In the first quarter of 2007, the project signed a new three-year agreement with Rumford Paper Company, the Project's steam host, which provides fixed payments of approximately $2.7 million per year with no operating, fuel or power price risks.

Cash Flow Available for Distribution

For the three months ended March 31, 2007, Cash Flow Available for Distribution was $20.8 million (Cdn $0.36 per diluted IPS) compared to $10.2 million (Cdn $0.27 per diluted IPS) for the same period last year. Distributions declared in the quarter were $14.0 million (Cdn $0.27 per IPS), resulting in a payout ratio of 67%, versus 97% in the first quarter of 2006. The increase in Cash Flow Available for Distribution was primarily due to higher operating cash flow, a full quarter's contribution from Path 15 acquired on September 15, 2006, and improved results at the Chambers and Pasco projects.

Strong Operating Performance

The Company reported project revenue of $67.3 million in the first quarter of 2007, an increase of over 25% from the first quarter last year. The increase was due to the acquisition of the Path 15 project and improved operational performance at existing projects. The Chambers project had increased generation and lower maintenance costs in the first quarter of 2007 due to the planned outage in the prior year period, and also experienced stronger spot market electricity pricing. Pasco benefited from increased generation and higher fuel efficiency due to the gas turbine upgrades completed in 2006.

Adjusted EBITDA at the Projects, including earnings from equity investments, increased 24% in the first quarter of 2007 compared to the prior year period. The increase was driven by the new contribution from Path 15 and the improved project performance discussed above. These increases were partially offset by the absence of any Selkirk or Gregory Adjusted EBITDA contributions. Because these two projects are accounted for under the cost method of accounting, their Adjusted EBITDA is equal to distributions received. There were no distributions received from these projects during the first quarter of 2007 because Selkirk receives its distributions in the second and fourth quarters of each year, and distributable cash at Gregory is currently restricted under the terms of its project-level debt agreement.

The Company generated a project loss of $34.9 million in the first quarter, which included non-cash mark-to-market losses of $48.4 million related to changes in the fair value of the Chambers PPA and Onondaga's swap and index hedge agreements. The fair value adjustment to the Chambers PPA arises due to adoption by the Company at January 1, 2007 of a new accounting standard for financial instruments, as fully described in the Company's first quarter 2007 MD&A. Excluding this non-cash accounting adjustment, project income was $13.5 million for the first quarter compared to $10.8 million in the prior year period. The net loss for the three months ended March 31, 2007 was $49.7 million or $0.81 per IPS. Not including the mark-to-market losses, the net loss would have been $1.3 million or $0.02 per IPS.

The calculation of Cash Flow Available for Distribution and a summary of Adjusted EBITDA by individual project for the three months ended March 31, 2007 are attached to this news release.

The Company's financial statements for the period and management's discussion and analysis for the three months ended March 31, 2007 are available on the Company's web site at www.atlanticpowercorporation.com or on SEDAR www.sedar.com.

Atlantic Power Corporation owns interests in a diversified portfolio of 15 power generation projects and one transmission line located primarily in major markets in the United States. Atlantic Power's objectives are to sustain and grow its cash distributions over the long term by enhancing the performance of its existing assets and by making accretive acquisitions.

Certain statements in this news release may constitute forward-looking statements, which reflect the expectations of the manager of the Company regarding the Projects and the anticipated financial results and operations of the Projects. Words such as "will", "anticipate", "expect", "project", "believe", "estimate", "forecast" and similar expressions are intended to identify forward-looking statements. Such forward-looking statements reflect current expectations regarding future events and operating performance and speak only as of the date of this news release. Forward-looking statements involve significant risks and uncertainties, should not be read as guarantees of future performance or results, and will not necessarily be accurate indications of whether or not or the times at or by which such performance or results will be achieved. A number of factors could cause actual results to differ materially from the results discussed in the forward-looking statements, including, but not limited to, the factors discussed under ''Risk Factors'' contained in the Company's annual information form dated March 28, 2007. Although the forward-looking statements contained in this news release are based upon what are believed to be reasonable assumptions, investors cannot be assured that actual results will be consistent with these forward-looking statements, and the differences may be material. These forward-looking statements are made as of the date of this news release and the Company assumes no obligation to update or revise them to reflect new events or circumstances.

Cash Flow Available for Distribution is not a measure recognized under Canadian generally accepted accounting principles ("GAAP") and does not have a standardized meaning prescribed by GAAP. Management believes Cash Flow Available for Distributions is a relevant supplemental measure of the Company's ability to earn and distribute cash returns to investors. A reconciliation of Cash Flows from Operating Activities to Cash Flow Available for Distributions is attached to this news release and is also included in the MD&A for the three months ended March 31, 2007. Investors are cautioned that the Company may calculate this measure in a manner that is different from other companies.

Adjusted EBITDA, earnings before interest, taxes, depreciation and amortization is not a measure recognized under GAAP and does not have a standardized meaning prescribed by GAAP. Management uses Adjusted EBITDA at the Projects to provide comparative information about Project performance. Investors are cautioned that the Company may calculate this measure in a manner that is different from other companies.

Atlantic Power Corporation Calculation of Cash Flow Available for Distribution (In thousands of U.S. dollars, except as otherwise stated)

                                              Three months ended March 31,
(unaudited)                                           2007            2006
---------------------------------------------------------------------------
Cash flows from operating activities                18,782           8,027

Project-level debt repayment                        (4,689)         (4,037)
Interest on IPS portion of Subordinated Notes        8,354           6,127
Income tax installments recoverable (net)(1)          (202)            548

Purchase of property, plant and equipment           (1,426)           (422)
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Cash flow available for distribution, US$           20,819          10,243

Cash flow available for distribution, Cdn$          24,150          11,938

Interest on IPS Subordinated Notes                   8,354           6,127
Dividends on IPS Common Shares                       5,610           3,824
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Total IPS distributions, US$                        13,964           9,951
Total IPS distributions, Cdn$                       16,297          11,421

Cash flow available for distribution per basic

 IPS, Cdn$                                           $0.39           $0.27

Cash flow available for distribution per diluted

 IPS, Cdn$                                           $0.36           $0.27

Total distribution declared per IPS, Cdn$            $0.27           $0.26
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1 Income tax installments recoverable represents management's estimate of

U.S. federal income tax installment payments that will be recovered in

future periods. The amount presented is comprised of installment payments

made during the period, offset by the current tax provision recorded in

the consolidated statement of operations and deficit and any income tax

refunds received. These adjustments have the effect of removing changes

in working capital resulting from the timing of tax payments from the

calculation of cash flow available for distribution.


Atlantic Power Corporation
Project Adjusted EBITDA(1)
(in thousands of U.S. dollars)

                                              Three months ended March 31,
(unaudited)                                           2007            2006

---------------------------------------------------------------------------

Adjusted EBITDA from consolidated and

 proportionately consolidated Projects
Badger Creek                                         1,276           1,449
Chambers                                             7,796           5,976
Koma Kulshan                                           172              28
Lake                                                 6,962           7,792
Mid-Georgia                                            442             306
Onondaga                                               161             (43)
Orlando                                              2,252           2,090
Pasco                                                3,317           1,532
Stockton                                               996             866
Topsham                                                415             415
Path 15                                              7,380               -
Other                                                  200             165

---------------------------------------------------------------------------

Total adjusted EBITDA from consolidated and

 proportionately consolidated Projects              31,369          20,576
Amortization                                        12,758          10,477
Interest expense, net                                6,157           3,587

Change in the future value of derivative

 instruments                                        48,403          (1,343)
Other income                                             9          (2,499)

---------------------------------------------------------------------------

Earnings (loss) from consolidated and

 proportionately consolidated Projects             (35,958)         10,354
---------------------------------------------------------------------------
Adjusted EBITDA from equity Projects
Delta-Person                                           598             525
Gregory(2)                                               -             958
Jamaica                                                982           1,008
Rumford                                                596             843
Selkirk(2)                                               -           3,165
Other                                                  (41)            (47)
---------------------------------------------------------------------------
Total adjusted EBITDA from equity Projects           2,135           6,452
Amortization                                           485           2,993
Interest expense, net                                  353           1,404
Income tax                                             212             220
---------------------------------------------------------------------------
Equity earnings, net                                 1,085           1,835

Project income
Total adjusted EBITDA from all Projects             33,504          27,028
Amortization                                        13,243          13,470
Interest expense, net                                6,510           4,991
Other (income) expense                                   9          (2,499)

Change in fair value of derivative instruments 48,403 (1,343) Income tax

                                             212             220

---------------------------------------------------------------------------

Project income (loss) as reported in the

 statement of income                               (34,873)         12,189

---------------------------------------------------------------------------

---------------------------------------------------------------------------

Earnings (loss) from consolidated and

 proportionately consolidated Projects             (35,958)         10,354
Equity earnings, net                                 1,085           1,835

---------------------------------------------------------------------------

Project income (loss) as reported in the

 statement of income                               (34,873)         12,189
---------------------------------------------------------------------------

1 Adjusted EBITDA is not a measure recognized under GAAP and does not have

a standardized meaning prescribed by GAAP. Adjusted EBITDA is defined as

earnings before interest, taxes, depreciation, amortization and changes

in fair value of derivative instruments. Management uses adjusted EBITDA

at the Projects to provide comparative information about Project

performance.

2 Effective January 1, 2007, the Gregory and Selkirk Projects are accounted

for under the cost method of accounting. See "Changes in Accounting

Policies" in the Company's MD&A for the three months ended March 31, 2007

for additional information.

FOR FURTHER INFORMATION PLEASE CONTACT:
        Atlantic Power Corporation
        
        Barry Welch
        (617) 977-2700
        Email: info@atlanticpowercorporation.com

Source: Atlantic Power Corporation
Contact: Atlantic Power Corporation Barry Welch President and CEO (617) 977-2700 Email: info@atlanticpowercorporation.com Website: www.atlanticpowercorporation.com