The Tennessee Valley Authority’s Bob Deacy shows U.S. Department of Energy secretary Jennifer Granholm the site of a future nuclear reactor in Oak Ridge.  Ben Pounds/Tennessee Lookout

DOE chief: Little nuke plants posited to provide clean energy 

This story was originally published by Tennessee Lookout.

OAK RIDGE — U.S. Department of Energy Secretary Jennifer Granholm visited the site of a possible first-of-its-kind nuclear reactor for the Tennessee Valley Authority this week. 

The utility’s board authorized $200 million to explore building a reactor on the site last year after the Nuclear Regulatory Commission gave TVA an early site permit in 2019. 

This first-of-its-kind small modular reactor would be smaller than standard nuclear reactors and generate less power, but it could have other advantages. While typical nuclear power plants need to provide power at 100 percent of their capacity constantly, a small modular reactor can more easily increase or decrease the amount of power it provides to the overall grid. Melinda Hunter, TVA nuclear communication specialist explained that this flexibility can complement renewable plants elsewhere in the TVA grid.

“When the sun’s not shining, you can bring the power up,” she said, adding that during sunnier periods the small modular reactors can provide less power.

TVA CEO Jeff Lyash said the utility will likely start building its first reactor on the site in 2027 and finish by the early 2030s. TVA is looking to build four of these reactors on the site, but it’s not made a final decision on the first one yet. Each reactor would generate 300 megawatts. 

Harvey Broome hiding in a buckeye tree on the way to Hughes Ridge, July 25, 1931.  Albert “Dutch” Roth

KNOXVILLE — The latest round of Conversation on Tap features members of the local Harvey Broome group of the Sierra Club discussing its efforts to address climate change.

It’s set for 7 p.m. Dec. 13 at Albright Brewing Company, 2924 Sutherland Ave. Proceeds from the event will benefit Discover Life in America, a crucial science partner with Great Smoky Mountains National Park.

Join Harvey Broome group vice-chairman Jerry Thornton and others to learn more about the local chapter of the Sierra Club and its efforts to address climate change.

Named after a Smokies advocate and Wilderness Society founder, the Harvey Broome chapter of the Sierra Club has been fighting to preserve wild places; create clean, safe communities; and encourage recycling and clean energy since 1972. 

Photograph from the Albert “Dutch” Ross Photograph Collection at the University of Tennessee Libraries

Albert Gordon "Dutch" Roth, born September 20, 1890 in Knoxville, Tennessee, is recognized as one of the most prolific early photographers of the Great Smoky Mountains' Greenbrier and Mount Le Conte sections. An early member of the Smoky Mountains Hiking Club, his photographs document club hikes and activities, including the construction of the clubhouse at Greenbrier.

What began in 1913 as a diversion soon developed into a serious avocation as Roth perfected his penchant for photography while avidly hiking the unexplored regions near his home. He worked primarily with a Kodak Autographic 122 camera, and, often carrying a heavy tripod, would climb twenty to thirty feet up a tree or venture hundreds of yards off the trail to capture the landscape images for which he was later noted.

This Caterpillar in-line 6-cylinder marine diesel engine will be the subject of research and development for efficient, more climate-friendly marine propulsion with methanol fuel.  Genevieve Martin, ORNL/U.S. Dept. of Energy

OAK RIDGE — The Department of Energy’s Oak Ridge National Laboratory and Caterpillar Inc. have entered into a cooperative research and development agreement to investigate methanol as an alternative fuel source for four-stroke internal combustion marine engines. The collaboration supports efforts to decarbonize the marine industry, a hard-to-electrify transportation sector.

As the U.S. continues to seek ways to reduce environmentally harmful greenhouse gas emissions, methanol is an attractive fuel alternative to diesel because it reduces carbon emissions. Methanol also reduces emissions of nitrogen oxides and sulfur oxides. In addition, methanol’s relatively high energy density makes it easier to store on marine vessels than gaseous fuels meaning it can be more easily integrated into overall existing engine design and operation.

Bull Run Fossil Plant in Anderson County, Tennessee, is officially offline as of Dec. 1, 2023, according to the Tennessee Valley Authority.  Abigail Baxter/Hellbender Press

TVA retires coal-fired plant; just four more to go

OAK RIDGE — The Tennessee Valley Authority took another step toward its goal to phase out all its coal plants by 2035.

TVA officially announced Bull Run Fossil Plant, at 1265 Edgemoor Road in Anderson County’s Claxton community, closed on Friday, Dec. 1. The TVA board decided to close the plant four years earlier on Feb. 14, 2019. Now the utility says it plans to retire all of its coal plants by 2035. The utility has cited the environment and efficiency as reasons for closing the plants. TVA plans to create solar and natural gas plants to replace the power formerly generated by coal. TVA has not made final plans for the Bull Run site.

“It’s not an easy decision to retire a plant, but it’s one we must make to secure a reliable and cleaner energy future as our generation portfolio and load shapes change,” Jacinda Woodward, senior vice president of power operations, said in a press release. 

ORNL researchers Lu Yu and Yaocai Bai examine vials that contain a chemical solution that causes the cobalt and lithium to separate from a spent battery, followed by a second stage when cobalt precipitates in the bottom.  Carlos Jones/ORNL/DOE

OAK RIDGE — Used lithium-ion batteries from cell phones, laptops and a growing number of electric vehicles are piling up, but options for recycling them remain limited mostly to burning or chemically dissolving shredded batteries. The current state-of-the-art methods can pose environmental challenges and be difficult to make economical at the industrial scale.

The conventional process recovers few of the battery materials and relies on caustic, inorganic acids and hazardous chemicals that may introduce impurities. It also requires complicated separation and precipitation to recover the critical metals. However, recovering metals such as cobalt and lithium could reduce both pollution and reliance on foreign sources and choked supply chains.

This research is funded as a project of the Advanced Battery Recycling Consortium, or ReCell, a program of the Vehicle Technologies Office within DOE’s Office of Energy Efficiency and Renewable Energy. Lu Yu and Yaocai Bai and researchers Rachid Essehli and Anuj Bisht contributed to the study, which utilized the DOE’s Center for Nanophase Materials Science at ORNL.

— Oak Ridge National Laboratory