Compare power plants

Registry, engineering, and operating metrics shown on a consistent EIA basis.

Metric	Sanborn BESS 3 Kern County	Tumbleweed Energy Storage Kern County
Capacity	169 MW	125 MW
Technology	Batteries	Batteries
Operator	Terra-Gen Operating Co-BESS	Tumbleweed Energy Storage, LLC
Operating units	1	2
Latest 12-month generation	221.7 GWh	147.2 GWh
Latest complete-year capacity factor	—	—
National technology rank	#79 of 962	#122 of 962
Latest EIA report	2026-06	2026-06

Generation comes from EIA-923. Capacity, unit counts, technology, and reporting relationships come from EIA-860. Incomplete reporting years are excluded from capacity-factor comparisons.