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Black Dog - an NSP coal-fixed plant that is making historyA booklet published by Northern States Power tells the history of the Black Dog plant.
NSP Flood of 1965Special issue of NSP News documenting the 1965 flood in NSP districts, including the Burnsville Black Dog Power Plant
Last Coal Train STRIBBy James Eli Shiffer APRIL 13, 2015 — 3:28PM

At 680 feet tall, the concrete smokestack of Xcel Energy’s Black Dog power plant towers over the Minnesota River bottomlands. It’s a Burnsville landmark and a monument to a half-century of electricity generated by burning millions of tons of coal.

What comes out of that stack is nearly invisible, but it’s potent. Black Dog pumped out 1.9 million tons of carbon dioxide last year, making it Minnesota’s fourth-largest carbon polluter among power plants last year, according to state data.
Next week, the big stack will stop exhaling, once the final stockpile of coal is burned. Black Dog will complete its conversion to cleaner-burning natural gas, ahead of a federal order to clean up its operations or shut down.

The muzzling of the Black Dog plant is a small but significant step away from the dirtiest energy source and a key factor in climate change. Coal-burning generators in Hoyt Lakes and Schroeder, Minn., will also shut down within the next month.

On Wednesday, the last coal train screeched into the plant, greeted by news cameras and Xcel Energy executives. Chris Clark, president of Xcel’s Minnesota operations, talked about his company’s plan to get 63 percent of its electricity from carbon-free sources by 2030. “We do see a transition away from coal,” he said.

Some of the Xcel execs admitted feeling a bit sentimental about the change. After all, the Black Dog plant has burned coal since the 1950s. At that time, the coal arrived by barges traveling up the Mississippi and Minnesota rivers.

They were replaced in the 1980s by rail cars. The trains arrived once or twice each week, hopper cars brimming with low-sulfur coal scraped from the prairies of Wyoming’s Powder River Basin.

Black Dog’s coal units provide enough electricity for 200,000 homes. But its enormous smokestack lacks any scrubbers, meaning there’s no filter for the toxic by-products of coal combustion.

Our dependence on coal has environmental implications all along the chain, from mountaintop destruction and deadly mine disasters to mercury contamination of fish, acid rain and greenhouse gases that heat up the planet. Wastewater lagoons where coal ash is dumped can spill into rivers. The fine soot particles from coal combustion can cause heart attacks.

A federal regulation on mercury and air toxics ultimately spelled the end of coal at Black Dog, which produced 73 pounds of mercury pollution in 2011, said Anne Jackson, principal engineer in the air policy unit of the Minnesota Pollution Control Agency. Nationwide, the emission reductions from that rule are expected to have enormous health benefits, including from 4,200 to 11,000 fewer premature deaths, according to the U.S. Environmental Protection Agency.

While two units were converted to natural gas in 2002, Black Dog’s units 3 and 4 will keep running on coal up to the federal deadline, but the mountain of coal behind the plant has dwindled to nothing. The state has already approved a plan to cap the coal ash ponds, said Brian Behm, the plant director. Xcel estimates the coal “decommissioning” will wrap up in 2021.

Black Dog is small enough that the strip mines of Wyoming will barely notice the lost customer. Although natural gas burns much cleaner, it also produces carbon pollution. Still, what happened at Black Dog is one more step toward a more sustainable energy future.

Burnsville Mayor Elizabeth Kautz also showed up Wednesday to watch the last train roll in to the power plant. Headlights flashing, the blue-and-white locomotive crossed a bridge over Black Dog Lake and stopped at the entrance to the dumper building. Its 125 cars would offload 12,500 tons of coal. By next week, the plant will have burned through all of it.

Kautz remembered when the power plant was just about the only business in Burnsville, so it has a special meaning for the city.

“It’s going to be cleaner facility that we can be proud of in the 21st century,” Kautz said. Kautz talked about the recreational trail that will replace Black Dog Road as another part of the area’s environmental renaissance.

Once the big smokestack comes down, though, Kautz has a lingering concern: “How do I find Burnsville when I’m flying in?
Contact James Eli Shiffer at james.shiffer@startribune.com or 612-673-4116. Read his blog at startribune.com/fulldisclosure.
Xcel Energy to make over Black Dog power plant in BurnsvilleThe Minneapolis utility plans to fully convert the power station from coal to natural gas by 2016, meaning the landmark smokestack now on the site would be demolished.
Xcel Energy formally asked Minnesota regulators Tuesday for permission to retire the last two coal-burning units at its 59-year-old Black Dog power plant in Burnsville and replace them with modern natural gas turbines.
The plan would more than double the electrical output of the plant from 253 megawatts to 700 megawatts and cost about $600 million, Xcel officials said.
The utility first signaled its intent in August to convert the aging plant, a move cheered by environmentalists and public health advocates.
People won’t see quite as much coming out of the stack. The reports we get downwind from Black Dog were that people would get ash settling on their vehicles,” said Robert Moffitt, spokesman for the American Lung Association in Minnesota.
The plant, built in 1952 with a single coal-burning unit, evolved over the decades. By 1960, it had four coal units, but in 2002, two of those units were decommissioned, plant director Tom Fallgren said.
Xcel installed the first of its natural gas-burning turbines then and it used the steam exhaust from that turbine to power another turbine kept from one of the decommissioned coal units, Fallgren said.
If approved, Minneapolis-based Xcel next year would tear down the last two coal units and begin construction on a natural gas facility in 2013.
The facility would have two combustion cycle turbines to produce power. A third turbine will be fed by the steam produced by the gas-burning units, Fallgren said.
The facility would employ 300 construction workers over the project period and come online in 2016, Xcel officials said.
The Black Dog plant work is similar to the utility’s recent makeover of its High Bridge and Riverside plants in St. Paul and Minneapolis. Both were aging coal-burning plants that were torn down and replaced with cleaner burning natural gas.
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