Good times are back at the Skyline coal mine in Helper, Utah. Arch Coal closed the mine and laid off 200 workers two years ago, when coal...

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ST. LOUIS — Good times are back at the Skyline coal mine in Helper, Utah.

Arch Coal closed the mine and laid off 200 workers two years ago, when coal was too cheap to justify extracting. But a mini coal boom is changing all that.

St. Louis-based Arch is investing about $40 million to reopen the mine, and miners are lining up for work.

“We’re in about as good a condition as we’ve been in some time,” said Delynn Fielding, director of economic development for Carbon County, where the mine is located.

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Fielding’s words could apply to the coal industry overall. Companies like Arch have seen surging profits and record-high stock prices. Expansion plans are in the works, from new coal mines to coal-fired power plants.

In Washington, D.C., a new energy bill has lessened the fear of regulatory hurdles for future coal burning.

But while consumers pay close attention to gasoline prices, few follow the market for a rocky fuel that generates about half of the nation’s electricity.

“For whatever reason, [coal is] not in the forefront of people’s minds when they think about energy,” said Fred Freme, a coal industry researcher with the U.S. Energy Information Administration. “But without it, half the lights in the country would go out.”

Coal is in the limelight this fall since increased demand and tight supply pushed up prices, said Mark Reichman, an analyst with A.G. Edwards in St. Louis.

Prices rose thanks to factors ranging from a train wreck last spring to economic growth in China, he said.

The price of a futures contract for a ton of coal in the Western United States rose from about $9 in June to $19.50 in October. That’s no blip, Reichman said.

“I think maybe we are entering a little bit of a new price range for coal,” he said.

The benefit is clear for the nation’s two biggest coal companies. The largest, Peabody Energy, reported a 141 percent increase in profit during the third quarter.

Arch reported a 75 percent increase.

Globally, the coal supply tightened two years ago when China switched from exporting to importing coal to feed its own energy needs, said Rich Bonskowski, a geologist with the federal Energy Information Administration.

Coal consumers in Europe, the United States and India are bidding up prices on supplies from smaller producers like Australia and South Africa, he said.

U.S. supplies tightened further in May when two trains derailed on a track that carried roughly 370 million tons of coal annually, about a third of the nation’s supply. Shipments will remain hindered until December, Bonskowski said.

The derailment had an outsized impact, because utility companies hadn’t built up coal reserves last year, expecting the price to drop, Bonskowski said.

With winter around the corner and electricity demand expected to rise, utilities have little choice but to buy coal on the open market, he said.

But coal remains far cheaper than other energy sources, said Bonskowski.

In July, it cost about $17 to generate a megawatt of electricity for an hour using coal. It cost $59 to generate the same energy with natural gas and $64 with liquid fuels such as kerosene, Bonskowski said.

Coal carries hidden costs, such as the price of complying with air-pollution rules. But as long as the price remains lower than other energy sources, it will be attractive to utilities, Bonskowski said.

Coal companies are ramping up efforts to meet the demand and cash in on higher prices.

Arch has outlined $400 million worth of investment to open and expand mines from West Virginia to Utah.

Peabody’s management has announced expansion plans that could generate 75 million tons of coal in five years.

Peabody’s stock hit a record high Oct. 3 when it closed at $86.12. Arch hit an all-time high Nov. 3, closing at $80.31.

Although they remain at historical highs, both stocks have since declined, Peabody trading Wednesday at $73.53 and Arch trading at $68.67.

New federal law, such as the 2005 Energy Policy Act passed in August, is paving the way for coal’s expanded use, Bonskowski said.

The biggest regulatory changes are geared toward the electric utility plants, which consume about 90 percent of all coal in the United States, he said.

The energy law sets a limit on the plants’ emissions but gives companies wide discretion for meeting the limits, Bonskowski said. If a utility can’t meet the standard it can pay the government for extra emissions.

The new law doesn’t mean it would be a free-for-all when it comes to building coal plants.

Peabody has faced stiff opposition from the Sierra Club and other environmental groups as it presses forward with new power plants in the Midwest.

In Kentucky, the Sierra Club filed a request with state authorities asking them to review Peabody’s plans for a new power plant. The move has stalled a regulatory process Peabody began in 2002.

The Sierra Club plans to resist new coal plants where they are proposed nationwide because emissions from the plants increase cases of asthma and other respiratory diseases, said spokesman Brendan Bell.

“If even a fraction of these [power] plants get built, we will be stuck with these plants for 30 or 40 years,” he said.