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 2021-10 report):
Plant Name / State
Agua Fria / AZ
go live / power
2021-09 / 25MW
status / status verbose
operation / operation
Plant id / generator id
141 / AFSB1
Entity name / entity id
Salt River Project / 16572
Changes: 2021-12
status: construction -> operation 🍾 🎉 🍸
status_verbose: (U) Under construction, less than or equal to 50 percent complete -> operation
date: 2021-10 -> 2021-09 accelerated by 1 month 2021-11
date: 2021-09 -> 2021-10 delayed by 1 month