Flatiron Energy
About
Flatiron Energy develops, builds and operates utility-scale battery energy storage projects in the United States.
It concentrates on urban areas of the Northeast and Mid-Atlantic where electricity demand is high, and it sources batteries from established vendors and aims to improve grid reliability, lower costs for ratepayers and provide flexible capacity as demand grows. Its leadership team, with backgrounds at ENGIE, Green Charge Networks and GE, cites more than a decade in standalone storage. Flatiron is a certified B Corporation and a portfolio company of Hull Street Energy, based in Denver.
The 2025 Battery Report covers SK On's September 2025 deal to supply Flatiron with up to 7.2 GWh of LFP batteries for storage.
From the Battery Report
Battery Report 2025 · chapterApplications: Stationary Energy StorageVolta Foundation's annual report on this part of the battery industry.Supply Chain Segments
Location Info
- HQ
- Denver, Colorado, United States
Sources
Where the details on this profile come from.
Headquarters: Denver, Colorado
- flatiron.energy · Company site · checked Oct 2026“info@flatiron.energy 3660 Blake St, Suite 750, Denver, CO 80205”
What they do: Energy Stationary Storage (ESS)
- Battery Report 2025, p.33 (Korean-origin Companies are Diversifying into LFP & BESS: SK On LFP ESS contract (CRU)) · Battery Report · checked Oct 2026
