Invenergy Announces Start of Commercial Operations of Gratiot County Wind Project in Michigan

CHICAGO, Illinois (June 6, 2012) – Invenergy Wind LLC (“Invenergy”) today announced the completion of construction and start of full commercial operations for its Gratiot

County Wind project in Central Michigan.

This 110.4 MW project, consisting of sixty-nine 1.6-megawatt GE Energy wind turbines, sells all of its power and renewable energy attributes to DTE Energy under a 20-year

power purchase agreement. Invenergy also completed construction on an adjacent 64-turbine, 102.4 MW project that was transferred to DTE Energy upon completion.

Combined, the two projects produce enough renewable energy to power approximately 50,000 homes, helping the utility meet Michigan’s renewable energy goals.

“Invenergy is delighted that the Gratiot County Wind project is generating clean, homegrown energy in Michigan,” said Michael Polsky, president and chief executive

officer of Chicago-based Invenergy. “We appreciate the strong support for this project and look forward to a long and successful relationship with our host community.”

Located near the town of Breckenridge on private land in the townships of Wheeler, Bethany, Emerson and Lafayette, the wind project:

• Employs eight full-time workers to operate and maintain the facility.

• Contributes to the area’s economic development through property tax payments, which can be used for schools, fire and police protection, road repair and other improvements.

• Supports the local economy through yearly lease payments to landowners.

• Was constructed by Livonia, Mich.-based Aristeo Construction.

About Invenergy

Invenergy and its affiliated companies develop, own and operate large-scale renewable and other clean energy generation facilities in North America and Europe. Invenergy is committed to clean power alternatives and continued innovation in electricity generation.

Invenergy's home office is located in Chicago and it has regional development offices throughout the United States, and in Canada and Europe.

The nation’s largest independent wind power generation company, Invenergy and its affiliated companies currently have 6,600 MW of wind, solar, and thermal projects under contract, in construction, or in operation. For more information, please visit www.invenergyllc.com.

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Contact:

Alissa Krinsky

Director of Communications

312-582-1554

akrinsky@invenergyllc.com