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Wind power in New Hampshire began in 1980, with the installation of the world's first wind farm at Crotched Mountain, consisting of 20 30 kW wind turbines, although it closed decades ago. Two wind power projects are operating in the state of New Hampshire – Lempster Mountain, which opened in 2008, and Granite Wind, which opened in late 2011 – while one is under construction, and three are proposed, as of 2012.
Brookfield's $275 million Granite Reliable Wind Farm has 33 Vestas three-megawatt wind turbines on mountains in the Phillips Brook area.
Groton Wind consists of 24 Gamesa G87 2.0 MW turbines, and are located along two ridges west of Plymouth, in the town of Groton. Although there is a high voltage power line to the west of the wind farm, the power is transmitted to a new substation at the Campton–Holderness town line. Turbines are 286 feet (87 m) tall and the blades are 139 feet (42 m) long. Operation is expected to begin by the end of November 2012, with full operation beginning in January 2013.
Two additional wind farms are proposed nearby, one in the towns of Alexandria, and Danbury, and the second, 60 MW, in the towns of Groton, Alexandria and Hebron.
The Antrim wind farm had been expected to begin construction in 2014, however, on February 7, 2013, New Hampshire's Site Evaluation Committee rejected the proposal by a 6 to 3 vote, the first time ever that the SEC has turned down a wind project. The primary reason for the rejection was stated as the visual and aesthetic impact the proposed turbines would have had on the Audubon Society of New Hampshire's Willard Pond Sanctuary and the region in general.
New Hampshire is a net power producer, generating more than is consumed. The output of Groton Wind is going to NStar, in Boston, and 55% of Granite is going to Vermont. In 2010 New Hampshire produced 22 million MWh, and used 7.7 million MWh.
A 2009 regulation requires state approval of any energy facility of over 30 MW, and transmission lines over 100 kV.