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Marty Snell of Black Hills Power monitors track operations of the Wygen III power plant in Wyodak, Wyo. Black Hills has spent $80 million on pollution controls for Wygen, but other coal plant efforts to curb greenhouse gases have lagged. (Associated Press)

Marty Snell of Black Hills Power monitors track operations of the Wygen III power plant in Wyodak, Wyo. Black Hills has spent $80 million on pollution controls for Wygen, but other coal plant efforts to curb greenhouse gases have lagged. (Associated Press)

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