Cali-Graf in Southern California

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279.5 kWh

Commercial batteryFortress Power

Fortress Power eSpire

279.5 kWh · 139.8 kW · Lithium Iron Phosphate

UL 1973CEC listed · Jul 21, 2023

Nameplate energy279.5 kWh
Continuous power139.8 kW
ChemistryLithium Iron Phosphate

Overview

CEC Battery List

eSpire: 279.5 kWh nameplate energy; 139.8 kW continuous; lithium iron phosphate.

Capacity & power

CEC Battery List

Nameplate energy (CEC)279.5 kWh
Max continuous discharge (CEC)139.8 kW
Full-power discharge timeabout 2 h at full power
ChemistryLithium Iron Phosphate

Inverter & compatible equipment

CEC Battery List

Certified systems using this batteryF587

Safety listings

CEC Battery List

UL 1973 (stationary battery)Certified by TUV SUD America
Certificate date & editionMay 24, 2023 · Ed. 2 : 2018

Documents

Sources

California Energy Commission — Energy Storage System List, data as of Oct 7, 2026. Manufacturer-reported values confirmed by CEC against certificates.
California Energy Commission — Battery List, data as of Oct 7, 2026.