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From NPR News, this is ALL THINGS CONSIDERED. I'm Melissa Block. And now, we'll check in on two of the big trends in energy production these days: first, the boom in natural gas and later the business of new oil exploration in the Arctic and some problems there. For decades, coal has been the king of electricity generation in the U.S. These days, natural gas is making a play for that title. And as NPR's Elizabeth Shogren reports, it's already scoring big wins in some unexpected places.

ELIZABETH SHOGREN, BYLINE: Just a few years ago, Georgia Power generated nearly three-quarters of its electricity with coal. Spokesman Mark Williams says those days are gone. Official data for 2012 isn't out yet.

MARK WILLIAMS: But we actually are going to see that we had more electricity produced from natural gas than from coal, which is a change for us.

SHOGREN: A big change, he says, brought about, largely, by low natural gas prices. This week, Georgia Power announced it wants to shut down 10 of its coal generators in the next few years. After that, coal plants would make up only a third of its fleet.

WILLIAMS: We do recognize this is a historic event for our company. We've never announced this many closings at one time.

SHOGREN: The company has already built three new natural gas plants. It's expanding a nuclear plant and going bigger into solar and wind. Industry experts say the switch from coal is a nationwide trend.

QUIN SHEA: We're seeing that across the board, regardless of the size of the companies.

SHOGREN: Quin Shea is vice president for environment at the Edison Electric Institute, the industry's trade group. He says in boardrooms across the country, electric companies are deciding that many coal plants, especially small, older ones, just don't make economic sense any more. Low price gas is only one factor. New federal rules require coal plants to clean up the mercury and other toxic chemicals in their exhausts. Installing those pollution controls makes no sense when gas is so cheap.

The shift has come faster than many electricity companies expected. Alan Beamon is an expert at the federal government's Energy Information Agency. He says, every year, utilities tell the government what their plans are for closing plants over the next decade.

ALAN BEAMON: A year ago those plans only included retirements of about 10- or 11,000 megawatts and now it's approaching 30,000 megawatts.

SHOGREN: That's nearly three times more plant closings than the companies predicted just a year earlier. Quin Shea, from the Edison Electric Institute, thinks even more coal plants will actually close over the next five years. He says whether the trend continues after 2018 depends on several factors: how much the economy and demand for electricity pick up, whether natural gas prices stay low, and if the federal government comes up with new regulations to limit greenhouse gases and clean up solid wastes from existing coal power plants.

Shea predicts there will be other losers in what he calls electric companies' dash to gas.

SHEA: We're not seeing any new coal built, we've talked about that. But we're also not seeing much occurring in the nuclear sphere. And importantly, the price of gas right now is really starting to freeze out demand for renewables.

SHOGREN: Still, natural gas is cleaner than coal, so greenhouse gas emissions from electricity generation are already decreasing. The Sierra Club's executive director, Michael Brune, predicts this good news will get even better as more coal plants close in the coming years.

MICHAEL BRUNE: So what that means is that those reductions will actually steepen over the next couple years. And it's happening in the absence of an overarching climate bill.

SHOGREN: But Brune says we can't rely on natural gas to stabilize the climate and stop the catastrophic effects of global warming that we got a taste of last year.

BRUNE: We're not even close to the pace of reductions that we need to see. If we really want to stop these droughts, wildfires and superstorms, we're going to have to accelerate the pace in which we move off of all fossil fuels.

SHOGREN: It's not just environmentalists who say this. Climate scientists agree. Brune says that means the country has to figure out a way to make the shift to natural gas a temporary one. Elizabeth Shogren, NPR News, Washington.

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