Ameresco Inc. announced late Thursday afternoon that it is postponing the release of its financial results for the fourth quarter and full year 2012 because it is evaluating the designation of an interest rate swap used in its hedging strategy to manage interest rate risk.

Headquartered in Framingham, the company provides energy efficiency and renewable energy services to its customers.

Ameresco said it is now analyzing the accounting treatment it has been using for interest rate swaps.

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In a press release, Ameresco said, “Once the company has completed its analyses, it expects to announce the date that it will release fourth quarter and full year 2012 financial results and host an earnings conference call.”