The windfarm, set to be located at Heckington Fen, Lincolnshire, will be made up of 22 turbines and have a generating capacity of 66MW.
Ecotricity founder Dale Vince called the Heckington Fen site “probably the best we’ve ever seen” for a windfarm.
He added: “We’re grateful to the secretary of state for his decision in the face of considerable political hot air right now on the subject of windmills, and we’d also like to thank the many people in the local community that wrote letters of support for the project.”