Bill Gates’ TerraPower aims to build its first advanced nuclear reactor in a coal town in Wyoming


Kemmerer, Wyoming, is a frontier coal town. It was organized in 1897 by coal miners and still employs people in the coal and natural gas industries today.

Photo courtesy TerraPower

TerraPower, a start-up co-founded by Bill Gates to revolutionize designs for nuclear reactors, has chosen Kemmerer, Wyoming, as the preferred location for its first demonstration reactor. It aims to build the plant in the frontier-era coal town by 2028.

Construction of the plant will be a job bonanza for Kemmerer, with 2,000 workers at its peak, said TerraPower CEO Chris Levesque in a video call with reporters Tuesday.

It will also provide new clean-energy jobs to a region dominated by the coal and gas industry. Today, a local power plant, a coal mine and a natural gas processing plant combined provide more than 400 jobs — a sizeable number for a region that has only around 3,000 residents.

“New industry coming to any community is generally good news,” Kemmerer Mayor William Thek told CNBC. “You have to understand, most of our nearby towns are 50 miles or more from Kemmerer. Despite that, workers travel those distances every day for work in our area.”

The town of Kemmerer, Wyoming. The statue is of J.C. Penney, as Kemmerer is home of the first Penney store, William Thek, the mayor of Kemmerer told CNBC.

Photo courtesy William Thek

For TerraPower, picking a location was a matter of geological and technical factors, such as seismic and soil conditions, and community support, said Levesque.

Once built, the plant will provide a baseload of 345 megawatts, with the potential to expand its capacity to 500 megawatts.

For reference, 1 gigawatt, or 1,000 megawatts, of energy will power a midsize city, and a small town can operate on about 1 megawatt, according to a rule of thumb Microsoft co-founder Gates provided in his recent book, “How to Avoid a Climate Disaster.” The United States uses 1,000 gigawatts and the world needs 5,000 gigawatts, he wrote.

It will cost about $4 billion to build the plant, with half of that money coming from TerraPower and the other half from the U.S. Department of Energy’s Advanced Reactor Demonstration Program.

“It’s a very serious government grant. This was necessary, I should mention, because the U.S. government and the U.S. nuclear industry was falling behind,” said Levesque.

“China and Russia are continuing to build new plants with advanced technologies like ours, and they seek to export those plants to many other countries around the world,” Levesque said. “So the U.S. government was concerned that the U.S. hasn’t been moving forward in this way.”

Once built, the plant should provide power for 60 years, Levesque said.

How TerraPower’s reactors are different

The Kemmerer plant will be the first to use an advanced nuclear design called Natrium, developed by TerraPower with GE-Hitachi.

Natrium plants use liquid sodium as a cooling agent instead of water. Sodium has a higher boiling point and can absorb more heat than water, which means high pressure does not build up inside the reactor, reducing the risk of an explosion.

Also, Natrium plants do not require an outside energy source to operate their cooling systems, which can be a vulnerability in the case of an emergency shutdown. This contributed to the 2011 disaster at the Fukushima Daiichi nuclear plant in Japan, when a tsunami shut down the diesel generators running its backup cooling system, contributing to a meltdown and release of radioactive material.

An artists rendering of a Natrium power plant from TerraPower.

Photo courtesy TerraPower

Natrium plants can also store heat in tanks of molten salt, conserving the energy for later use like a battery and enabling the plant to bump its capacity up from 345 to 500 megawatts for five hours.

The plants are also smaller than conventional nuclear power plants, which should make them faster and cheaper to build than conventional power plants. TerraPower aims to get the cost of its plants down to $1 billion, a quarter of the budget for the first one in Kemmerer.

“One important thing to realize is the first plant always costs more,” said Levesque.

Finally, Natrium plants produce less waste, a problematic and dangerous byproduct of nuclear fission.

‘Times are changing’

The Kemmerer plant still faces a couple of hurdles, including federal permitting.

“There’s a comprehensive licensing process overseen by the Nuclear Regulatory Commission that, frankly, is expensive,” Levesque said. “There are many, many reviews.”

Also, the fuel that the Natrium plant uses is called high-assay low-enriched uranium, or HALEU, which is not yet available at commercial scale.

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The existing fleet of nuclear reactors in the United States runs uranium-235 fuel enriched up to 5%, the Department of Energy says, while HALEU is enriched between 5% and 20%.

“Sadly, we don’t have this enrichment capability in the U.S. today,” Levesque said. “And this is an area of great concern of the U.S. government and specifically the Department of Energy.”

But it’s coming, he said. “I’m really certain that we’re going to establish that capability” in another public-private partnership, similar to the way the Natrium power plant demonstration is being built.

Once built, the plant will be turned over to Rocky Mountain Power, a division of Berkshire Hathaway Energy’s PacifiCorp, to operate.

There, it will become part of Rocky Mountain Power’s decarbonization plan.

Coal-fired plants like the Naughton facility in Kemmerer “have benefited our customers for decades with very low-cost power,” Gary Hoogeveen, president and CEO of Rocky Mountain Power, said Tuesday. “And we appreciate that. But times are changing.”

“External requirements from the federal government, state governments, regulatory agencies are going to require that we change, and we’re going to need to decarbonize,” he said. “As we go down that path, we see the Natrium project as being incredibly valuable to our customers.”

Wind power is also a part of that effort. So far, Rocky Mountain Power has built 2,000 megawatts of wind-power capacity in Wyoming, and that’s going to grow.

“Wyoming is a tremendous wind-resource state,” Hoogeveen said. “We expect to build many more thousands of megawatts of wind capacity in the state.”

But the nuclear power plant in Kemmerer will be a key bridge for the state, Hoogeveen said.

“It is a great spot for absorbing the intermittency of the renewable resources and using the storage that’s built in that is so incredibly valuable to us,” he said.


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