Clearway Energy Group’s 147-megawatt Rosamond Central Battery Energy Storage System is the company’s first battery retrofit project, made up of lithium-ion batteries delivering power for four hours nightly to support the reliability of California’s power grid.
The project, located adjacent to Clearway’s 192-megawatt Rosamond Central solar array, brings the company’s battery storage portfolio to more than 850 megawatts.
Energy storage at the site is contracted to Rosemead-based utility Southern California Edison under a long-term power agreement. It and Clearway have partnered on projects accounting for more than 1.5 gigawatts of renewable power, including the Alta Wind Energy Center at the Tehachapi Pass.
Clearway reported Rosamond Central BESS is among the first battery energy storage projects financed under the Inflation Reduction Act of 2022’s energy community bonus incentive. The measure offers a credit of up to 2.75 cents per kilowatt-hour for renewably produced power projects built by workers, including qualified apprentices, are paid prevailing wages.
The company said more than 50 union workers led by San Jose-based electrical contractor Rosendin, built the installation over 115,000 man-hours of injury-free labor. The batteries were supplied Finnish Wärtsilä.
“Battery storage projects like Rosamond Central BESS play an essential role in deliverying on California’s Resource Adequacy program to keep the lights on for homes and businesses acros sthe state during peak hours,” Senior Vice President of Operators Valerie Wooley of Clearway said in a news release.