Community Windpower has announced the cancellation of six onshore wind power schemes, blaming changes in government support.
The schemes had included one 16-turbine wind farm in Cornwall and another of 13 turbines in Lancashire.
Four further projects in Cornwall have also been cancelled, which would have seen up to 20 turbines erected.
The company said four jobs would be lost, two each in Lancashire and Cornwall, and each local economy would also lost £100m.
Community Windpower managing director Rod Wood accused the government of “constantly shifting its position on UK renewables”, according to the BBC.
He also said other generators in the market shared his feelings.
A spokesperson for the Department of Energy and Climate Change said onshore wind continues to have a vital role in the UK and aims to see 13 GW deployed by 2020.
The DECC said it is consulting on a new support mechanism to provide onshore wind generators with guaranteed revenue over a 15-year period.