Papers have been lodged at a Scottish court, which could prevent a new coal-fired power station being built in Ayrshire.
Campaigners are asking for a judicial review of the plans for the power station at Hunterston, following claims the Scottish Government did not consult on the proposals in line with European law, reports the BBC.
The power station was a late addition to the National Planning Framework, which outlines major projects in the country.
The Hunterston facility is planned to be built next to British Energy's nuclear power plant, due to be shut down by 2016.
The proposed 1600MW plant would be able to power the about two million homes.
The plant is also scheduled to be close to deep water port facilities, as it would be dependent mainly on imported coal, which contains lower emissions than coal from Scottish fields.