The Environmental Protection Agency announced Monday it has stopped all work on its model climate rules meant to guide states as they implement regulations for cutting greenhouse gas emissions from existing power plants.

EPA air chief Janet McCabe said it was ending the final-stage review process for the model rules effective immediately, and said the agency will make the unfinished rules available to the 14 states interested in applying them. Most of the remaining states are fighting the Clean Power Plan, the central regulation that the model rules would apply, in federal appeals court.