By Amanda Eggert, Montana Free Press
The appeal is the latest development in a legal tug-of-war over power plant emissions.
Two energy companies seeking the continued operation of a coal-fired power plant in Colstrip are asking the U.S. Supreme Court to block a federal emissions standard from taking effect.
Talen Montana and NorthWestern Energy this week requested that the Supreme Court halt a rule the U.S. Environmental Protection Agency adopted in April to limit airborne pollutants that are released when coal is burned for electricity.
