Black Hills to shutter some coal-fired plants - Businessweek

Black Hills to shutter some coal-fired plants - Businessweek: "Black Hills Corp. said Monday that its utilities will close some older coal-fired power plants because it would cost too much to bring them in compliance with new federal and state environmental regulations.

The company said its Colorado Electric subsidiary will idle a plant in Canon City, Colo., at the end of this year but keep it available for power-generation during peak demand until retiring the plant at the end of 2013."

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