Form Energy Raises $750 Million to Double Its Weirton Iron-Air Battery Plant

Energy Storage News Storage Markets & Tariffs
Marin Holt
August 12, 2026
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6 minutes read

Round: $750 million Series G
Lead investor: T. Rowe Price
Total equity raised: $2 billion
Contracted backlog: 80 GWh
Discharge duration: 100 hours

Form Energy closed a $750 million Series G round on August 12, 2026, led by T. Rowe Price. Most of the money goes to Form Factory 1, the company’s iron-air battery plant in Weirton, West Virginia. That plant covers about one million square feet today, and Form wants to roughly double it. The round pushes total equity raised past $2 billion. Morgan Stanley acted as sole placement agent.

What the Money Buys

Form builds a battery that discharges for up to 100 hours. It runs on iron, water and air instead of lithium. The chemistry costs far less per kilowatt-hour than lithium-ion and weighs far more per kilowatt, which suits multi-day outages rather than daily peak shaving.

The company reports about 80 GWh of storage under commercial agreement, a backlog it says quadrupled since the start of the year. The largest single contract belongs to Google. It covers a 30 GWh system tied to a Minnesota data center, which TechCrunch valued at roughly $1 billion. Crusoe Energy contracted for 12 GWh earlier this year, and Xcel Energy and FuturEnergy Ireland hold agreements as well.

Form employs about 1,000 people: roughly 450 in Weirton, 250 in Somerville, Massachusetts and 200 in Berkeley, California. The company named Navneet Govil chief financial officer and Wes Sloan chief operating officer alongside the raise. Sloan joins from Panasonic Energy Corporation of North America.

Why It Matters

Data center load changed the arithmetic for long-duration storage. Utilities spent a decade treating 100-hour storage as a decarbonization tool with no near-term buyer. Hyperscalers now shop for firm capacity they control, and they sign faster than any utility procurement cycle runs. Google and Crusoe alone account for 42 GWh of Form’s book.

Scale is the honest measure of that shift. US grid-scale storage installations reached 9.7 GWh in the first quarter of 2026, up 32% year over year. Nearly all of it was lithium-ion sized for two to four hours. The 80 GWh backlog is roughly two years of the entire national install rate, in a chemistry almost nobody has run at grid scale.

The gap worth watching is delivery, not demand. Form began shipping from Weirton in 2025, and most contracted systems land in 2027 or later. A backlog is an order book, not an installed base.

Doubling a one million square foot factory takes years. The quadrupled-backlog figure comes from the company rather than from an independent count. Form further states that United States suppliers provide 80% of its materials, a claim no third party has audited.

Critical Perspective

Form reports about 80 GWh under contract, roughly two years of the entire US grid-storage install rate. That book rests on a handful of buyers, and Google alone holds 30 GWh of it, so a single hyperscaler pausing capex would reprice the whole plan. Northvolt AB raised billions against a comparably crowded order book and entered bankruptcy in 2025 with its flagship plant far below planned output. If the cells reach the field and utilities find the 100-hour duty cycle rarely gets called, who eats the stranded capacity?