The price offered by the British authorities for electricity generated by wind farms must be increased by up to 70%, according to the head of the country’s top power provider.

Tom Glover, RWE’s UK Country Chair, has cautioned that without the hike, new wind parks will not be economically feasible.

According to Glover, London should pay between £65 ($79) and £75 per megawatt hour (MwH) for the power generated from the farms versus the £44 offered in the most recent government-run auction.

“We need to see a materially higher price,” he said. “Every project is different but £65 to £75 feels about the right range.”