The government data source for this battery is the U.S. Energy Information Administration (EIA)
https://www.eia.gov/electricity/monthly/
Info from the 2024-02 report (Project first appeared in the 2020-09 report):
Plant Name / State
Gemini Solar / NV
go live / power
2024-02 / 380MW
status / status verbose
construction / (U) Under construction, less than or equal to 50 percent complete