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Matrix Renewables Announces the Commissioning of Pleasant Valley Solar 1

LCG, April 15, 2025--Matrix Renewables announced today the successful commissioning of the Pleasant Valley Solar 1 power generation facility in Ada County, Idaho. The 200-MWac solar facility includes a Power Purchase Agreement (PPA) that was secured through negotiation with Meta and Idaho Power. Matrix Renewables states the facility is the largest operational solar facility in Idaho Power's system. Sundt Renewables, the Engineering, Procurement, and Construction (EPC) services provider, completed construction of the project on March 2nd.

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Duke Energy Seeks to Extend Operating License for Robinson Nuclear Plant

LCG, April 9, 2025--Duke Energy announced yesterday its submission of a subsequent license renewal (SLR) application to the U.S. Nuclear Regulatory Commission (NRC) for the Robinson Nuclear Plant, a 759-MW nuclear unit located near Hartsville, South Carolina. The application requests extending the plant's operations for an additional 20 years.

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Industry News

Pumped Storage Using Compressed Air Eyed in Ohio

LCG, April 26, 2001Engineers have long sought a means to store electricity, and so far have come up with two that work: batteries and pumped storage. Flywheels and other schemes haven't shown a lot of promise.

Pumped storage, as it is usually practiced, consists of using inexpensive off-peak power to operate pumps that move water back up over a dam so it can run through the turbines again during periods of high demand for electricity.

Now, researchers at the Department of Energy's Sandia National Laboratories, along with Haddington Ventures of Houston, are looking at a 2,200-foot deep limestone mine near Norton, Ohio, for a different kind of pumped storage, the Environment News Service reports.

"The intent is to cycle air pressure into the mine using compressors during off peak electrical power at times like evenings and weekends to increase air pressure in the mine," said Sandia researcher Steve Bauer. "During the daily peak needs for electricity, air pressure will be bled off through modified combustion turbines to generate electricity. The energy is stored as pressure."

The limestone is very dense with few, in any, natural fissure, Sandia researchers say. Working pressures in the mine could range between 800 and 1,600 pounds per square inch.

An ad hoc Haddington subsidiary, Norton Energy Storage, will build and operate the plant, which could enter service in about two years. The facility will be built in units, with an eventual generating capacity of about 2,700 megawatts.

"During electric generation, some natural gas will be burned to super expand the compressed air," Bauer said. "When at its full production stage of 2,700 megawatts, it will produce the same amount of emissions as a 600 megawatt gas powered combustion turbine power plant."

During off-peak hours, when air compressors are rebuilding those high pressures in the mine, they will get their power from conventional power plants, which in Ohio means coal-burners.

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