The 470MW plant is located on a 66,000-acre site covering parts of Harper, Barber, Kingman and Sumner counties in southern Kansas.

Flat Ridge 2 – owned 50-50 by BP and Sempra – is the state's biggest wind project, say the two companies.

The owners say the plant was built in Kansas in part because of its business environment but largely because of its wind resources, which have been ranked the second-best in the US.

The