August 6, 2020: Tesla and the Pacific Gas and Electric Company on July 29 broke ground on a 182.5MW/730MWh lithium-ion battery installation at Moss Landing, California that they say will be the largest utility-owned storage system of its kind in the world.
The agreement allows Tesla to increase the size even further, to a total of 1GWh in total, which would mean six hours of power at 182.5MW.
California already has the largest battery in the US connected to its grid, on July 13 saying it had connected a 62.5MW/250MWh battery to its San Diego County power grid.
Tesla won approval from the Monterey Planning Commission in February to install the Elkhorn Battery Storage Facility, which will store wind and solar power and replace the existing power plant.
More than 250 Tesla Megapack units will be installed on 33 concrete slabs, and will be able to dispatch the energy to the grid at periods of high demand.
“The scale, purpose and flexibility of the Moss Landing Megapack system make it a landmark in the development and deployment of utility-scale batteries,” said Fong Wan, senior vice president for energy policy and procurement at PG&E.
The utility predicts the system will save more than $100 million over the 20-year life of the installation.
Tesla is no stranger to massive-scale battery storage projects, but this one will be five and a half times the size of its largest one to date, the 100MW/129MWh Hornsdale Power Reserve in South Australia.