Tesla Megapack Battery Energy Storage System Goes Live at Moss Landing


MOSS LANDING – The Tesla Megapack battery energy storage system at Moss Landing became fully powered and certified for market participation, recently bringing 182.5 megawatts of stored energy capacity to the California power grid.

Pacific Gas and Electric Co. announced Monday that the Elkhorn Battery, named for its location at its Moss Landing electrical substation in Monterey County near Elkhorn Slough, has been commissioned after final testing. . The battery energy storage system was powered up and certified by the California Independent System Operator on April 7.

“We are ushering in a new era of electrical system reliability and providing a vision of the future for our customers with the commissioning of the Tesla Megapack system at Moss Landing,” said Patti Poppe, CEO of PG&E Corporation, in a statement. hurry. “We are committed to safely delivering reliable, clean energy in a way that brings the greatest value to our customers, but we cannot go it alone in this clean energy future. Projects like this require innovative partners, like Tesla, and PG&E will continue to seek out and work with the best and the brightest to deliver game-changing clean energy solutions to our customers.

Battery energy storage enables the integration of renewable energy sources such as solar and wind, while improving the reliability of California’s energy supply. The batteries are charged when power demand is low or when solar production is high, then provide additional capacity by sending this reserved power to the grid when demand increases.

The Elkhorn Battery System was designed, built and serviced by PG&E and Tesla, and is owned and operated by PG&E. It represents one of the largest utility-owned lithium-ion battery energy storage systems in the world.

The California Public Utilities Commission approved the battery energy storage system in November 2018 and the Monterey County Planning Commission approved it in February 2020. Construction on the site began in July 2020. It includes 256 Tesla Megapack battery units on 33 concrete slabs with each unit. house batteries and power conversion equipment in a single cabinet. Transformers and switchgear were also installed with the megapacks to connect the energy stored in the batteries to the 115 kilovolt electrical transmission system.

The battery energy storage system has the capacity to store and send up to 730 megawatt hours of energy to the electrical grid at a maximum rate of 182.5 MW for up to four hours during periods of high demand. The Tesla Megapack Elkhorn Battery system participates in the California Independent System Operator’s wholesale electricity markets, supplying power and ancillary services to the electric grid.

PG&E now has contracts for battery energy storage systems totaling more than 3,330 MW of capacity deployed across California through 2024.

The systems are part of PG&E’s efforts to procure energy resources prompted by the California Public Utilities Commission’s 2021 ruling ordering all state load utility entities, including investor-owned utilities such than PG&E, to collectively procure 11.5 gigawatts of new electrical resources.

The power would come online between 2023 and 2026 to support California’s greenhouse gas reduction policy and to replace power generation from scheduled withdrawals from Southern California natural gas power plants and of PG&E’s Diablo Canyon Nuclear Power Plant.

To date, 955.5 MW of the contracted 3,330 MW of new battery storage capacity has been connected to the California power grid, including:

• 182.5 MW PG&E Elkhorn battery in Monterey County, commissioning in 2022.

• 200 MW Diablo storage system in Contra Costa County, commissioned in 2022.

• 60 MW Coso Battery Storage located in Inyo County, commissioned in 2022.

• 400 MW Vistra Moss Landing battery energy storage facility in Monterey County, commissioning in 2021.

• 63 MW NextEra Blythe system in Riverside County, commissioned in 2021.

• 50 MW Gateway system in San Diego County, commissioned in 2021.

PG&E expects more than 1,400 MW of additional storage capacity, of the 3,330 MW under contract, to come online in 2022 and 2023.

The Vista Moss Landing battery energy storage facility uses LG Energy Solution batteries and is located adjacent to the Tesla Megapack Elkhorn battery storage system.

Phases I and II of the Vistra Storage System at Moss Landing have been closed since September 2021 and February 2022 respectively. The cause of both incidents was believed to be the overheating of the batteries which activated the sprinkler systems. The company is continuing to research and take steps to mitigate the possibility of similar future events. There were no injuries or deaths in either incident.

Vistra Energy is preparing to further expand its Moss Landing battery energy storage facility with the 350MW Phase III, as agreement contracts with PG&E have been met and pending approval of the agreements by the California Public Utilities Commission.


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