Jan. 23 (Bloomberg) -- The U.S. Environmental Protection Agency placed a hold on approval of a coal-fired power plant in South Dakota, a move environmental groups say indicates increased scrutiny under PresidentBarack Obama.

"This is a signal that the Obama administration is taking a much harder look at coal power from the previous administration," said Darrell Gerber, a program coordinator at Washington-based Clean Water Action, which along with the Sierra Club opposed the plant.

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