Conservative groups this week pushed Congress to end tax credits that are subsidizing wind energy, and said taking this step could be a way to stop new carbon regulations proposed by President Obama, since doing so would expose wind energy’s true costs.

In a letter addressed to Rep. Paul Ryan, R-Wis., and other House leaders, the American Energy Alliance, Heritage Action for America, Club for Growth and Americans for Prosperity said the wind production tax credit hides the true cost of the new regulations announced last month by the Environmental Protection Agency. They also argued that the industry is mature and shouldn’t need subsidies at this point, and said the subisdies are just hiding the huge costs of this power source.