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California utility PG&E seeks approval for 423MW of four-hour duration battery storage

Image: NextEra Energy Resources.

Utility PG&E has asked the California Public Utilities Commission (CPUC) for approval of five large-scale battery projects, each with four-hours duration, that will take the investor-owned utility (IOU) past 1,000MW of battery energy storage in its service area.

The projects each include lithium-ion battery storage and comprise three standalone storage, one co-located with large-scale solar PV and one co-located with an existing geothermal power plant. One of the newly awarded projects will be a 100MW / 400MWh addition to the site of Moss Landing, a 300MW / 1,200MWh plant currently under development by project partners Dynegy and Vistra Energy. Vistra Energy said CPUC approval is expected to be forthcoming within 120 days of the utility filing on 16 May. If approved, the newly-announced projects are expected to be completed and online by August 2021.

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Together they add up to 423MW of battery storage and represent the first phase in a procurement by PG&E of “at least” 716.9MW of resources to aid reliability of the electricity system. The next phase of competitive solicitation for the remaining resource adequacy capacity will be held this summer. The procurements are being held in response to a late 2019 CPUC ruling, following which PG&E launched its request for offers (RFO).

California has been the US leader for battery energy storage deployment since PG&E and the other two major investor-owned utilities (IOUs) in the state, Southern California Edison (SCE) and San Diego Gas & Electric (SDG&E) were mandated to procure 1.35GW of energy storage through the passing of Assembly Bill 2514 (AB2514) in the early 2010s.

Since the regional market was kickstarted by that endeavour, the utilities have moved separately to procure large amounts of energy storage on their systems, including in response to natural gas retirement plans. Most recently, SCE awarded contracts to 770MW of energy storage projects, as reported by this site earlier this month.

PG&E too, has awarded multiple hundreds of megawatts of energy storage contracts to provide energy made up from the shortfall in natural gas as fossil fuel resources are replaced. PG&E, which provides energy to around 16 million people through power and gas, said that by 2023, it will have surpassed the 1,000MW mark for battery storage in its its service area.

The award projects up for approval are as follows:

Project name Awarded company Output Length of contract(s) Configuration Location Notes
Diablo Energy Storage Project Diablo Energy Storage LLC 150MW (3 x 50MW) 15 years Standalone Li-ion energy storage Contra Costa County An expansion to an existing 50MW project under development.
Vistra Energy MOSS100 Energy Storage Project Dynegy Marketing & Trade LLC 100MW 10 years Standalone Li-ion energy storage Moss Landing, Monterey County Expansion to the 300MW/1400MWh project at Moss Landing.
Gateway Energy Storage Project Gateway Energy Storage LLC 50MW 15 years Standalone Li-ion energy storage San Diego
Blythe Energy Storage 110 Project NextEra Energy Resources 63MW 15 years Co-located w/ solar PV Blythe, Riverside County Co-located with existing 110MW solar plant (built 2016)
Coso Battery Storage Project Coso Battery Storage LLC 60MW 15 years Co-located with geothermal Little Lake, Inyo County Transmission line-connected, co-located with existing geothermal plant

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