Energy from Pioneer Prairie Wind Farm to Power Missouri Homes HOUSTON, June 18 /PRNewswire/ -- Horizon Wind Energy, LLC, a leading wind project developer, owner and operator, owned by EDP Renovaveis, has just entered into a 15-year Power Purchase Agreement with AmerenUE to sell renewable wind energy from the 102.3 MW second phase of its Pioneer Prairie Wind Farm, which has a total installed capacity of 300 MW already in operation. "This is Horizon's first Power Purchase Agreement with AmerenUE and we applaud AmerenUE for making a long-term commitment to supply their Missouri customers with pollution-free wind energy," said Gabriel Alonso, Chief Executive Officer of Horizon Wind Energy. "This is the third PPA closing for our 2009 project portfolio; we find this to be encouraging and are proud to partner with AmerenUE." The second phase of the Pioneer Prairie Wind Farm is located in Mitchell County, Iowa. The wind farm spans approximately 10,000 acres and is comprised of 62 Vestas V82 wind turbines that produce 1.65 MW each. The second phase of the Pioneer Prairie Wind Farm began full operations in January 2009. About Horizon Wind Energy Horizon Wind Energy LLC ("Horizon") develops, constructs, owns and operates wind farms throughout North America. Based in Houston, Texas with over 20 offices across the United States, Horizon has developed more than 2,800 megawatts (MW) and operates over 2,000 MW of wind farms. Horizon is owned by EDP Renovaveis S.A. (NYSE Euronext: EDPR), a global leader in the renewable energy sector that designs, develops, manages and operates power plants that generate electricity using renewable energy sources. With a sound development pipeline, first class assets and market-leading operating capacity, EDPR has undergone exceptional development in recent years. Energias de Portugal, S.A. ("EDP"), the parent company of EDPR, is a vertically-integrated utility company, headquartered in Lisbon, Portugal. Through its various constituent businesses, EDP holds significant electricity and gas operations in Europe, Brazil, and the United States. For more information, visit http://www.horizonwind.com/ and http://www.edprenovaveis.com/. About AmerenUE Founded in 1902, AmerenUE -- Missouri's largest electric utility -- provides electric service to approximately 1.2 million customers across central and eastern Missouri, including the greater St. Louis area. UE serves 57 Missouri counties and 500 towns. More than half (55 percent) of UE's electric customers are located in the St. Louis metropolitan area. AmerenUE is a subsidiary of Ameren Corporation (NYSE:AEE) -- Ameren utility companies provide electricity to a total of 2.4 million customers across Missouri and Illinois. For more information, please visit: http://www.ameren.com/. DATASOURCE: Horizon Wind Energy, LLC CONTACT: Sarah Bray, Communications Manager, +1-713-265-0310, cell, +1-832-226-2116, fax, +1-713-265-0365, or Web Site: http://www.horizonwind.com/

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