FundraiseSep 21, 2026, 16:15 UTC

Form Energy secures $270M credit facility to scale iron-air batteries

What's the deal? Form Energy, an American developer of multi-day energy storage systems, has closed US$174.7M credit facility to fund its manufacturing scale-up in Weirton, West Virginia. Barclays led as sole structuring bank and initial coordinating lead arranger, with Citi, Jefferies, JPMorgan Chase, RBC Capital Markets, Societe Generale, Stifel, and Wells Fargo joining the syndicate.

How it's structured: The facility combines a revolving credit line and a tax credit advance facility that draws against credits generated under the Section 45X Advanced Manufacturing Production Credit. An accordion feature allows the debt to expand to up to $1 billion.

What's the endgame? Proceeds will support manufacturing scale-up and working capital as Form builds out its iron-air battery systems at Form Factory 1. The batteries are made from iron, water, and air, and are designed for 100-hour duration to help stabilise the electric grid.

Why now? The financing follows Form'US$550M Series G round, which closed in August and lifted total equity raised past $2 billion. The debt facility lets the company fund production without further diluting shareholders.

The signal: The deal ranks among the largest debt rounds ever for a US deep tech company, sitting in the 97th percentile by size across nearly 2,000 comparable rounds. Tapping bank syndicates and manufacturing tax credits shows how capital-intensive energy startups are moving beyond equity to finance factory buildouts at scale.