The government data source for this battery is the U.S. Energy Information Administration (EIA)
https://www.eia.gov/electricity/monthly/
Info from the 2022-02 report (Project first appeared in the 2020-09 report):
Plant Name / State
AES ES ALAMITOS, LLC / CA
go live / power
2021-01 / 100MW
status / status verbose
operation / operation
Plant id / generator id
61204 / ALMTS
Entity name / entity id
AES ES Alamitos, LLC / 62160
Changes: 2021-03
status: construction -> operation πΎ π πΈ
status_verbose: (V) Under construction, more than 50 percent complete -> operation