Analysis
The Round
Form Energy raised $750 million in Series G funding led by T. Rowe Price, with Sequoia Capital, Janus Henderson, Franklin Templeton, TPG Rise Climate, Breakthrough Energy Ventures and GE Vernova also participating, according to TechCrunch. The capital expands manufacturing capacity at the company's West Virginia battery plant.
What Form Energy Builds
Form Energy makes iron-air batteries that can discharge power for up to 100 hours -- dramatically longer than the four-hour duration typical of lithium-ion grid batteries -- by relying on iron instead of pricier minerals like lithium, cobalt and nickel. About 80% of the company's materials are sourced from the US, with the remainder from Europe and Asia, notably excluding China, a supply-chain positioning that has become commercially and politically valuable as AI data centers compete for grid capacity.
The Customer Base
Google is building a new Minnesota data center partially powered by a 30-gigawatt-hour Form battery installation that Pulse covered costing the company roughly $1 billion. Crusoe committed in March to buy 12 gigawatt-hours of Form batteries, and utility Xcel Energy and FuturEnergy Ireland are also customers -- a mix spanning both AI hyperscalers seeking dedicated backup power and traditional utilities looking to firm up renewable generation.
Why Long-Duration Storage Matters Now
The round lands squarely inside the AI data center power crunch: hyperscalers need power that's reliable around the clock, and renewable generation alone can't guarantee that without long-duration storage to smooth out gaps. A 100-hour discharge window lets a battery installation cover multi-day gaps in solar or wind generation in a way four-hour lithium-ion systems can't, positioning Form Energy's technology as infrastructure for AI-driven power demand specifically, not just general grid storage.
Numbers in Context
$750 million is one of the larger climate-tech venture rounds of 2026, and it comes from a mix of public-market asset managers (T. Rowe Price, Janus Henderson, Franklin Templeton) alongside traditional venture and climate funds -- a blend that suggests institutional investors are treating Form Energy's technology as closer to infrastructure than early-stage venture risk at this point in its life. Google's roughly $1 billion single-installation purchase is itself a larger commitment than many venture rounds this year, underscoring how much capital AI data center power needs are pulling into adjacent industries like grid storage.
The Counterweight
Iron-air battery technology, while promising on cost and duration, has a much shorter commercial deployment track record than lithium-ion -- Form Energy is still scaling manufacturing, and a $750 million raise funds expansion of a plant that hasn't yet proven it can hit volume and cost targets at the scale its hyperscaler customers ultimately need. Long-duration storage is also a newer category competing against simply building more natural gas peaker capacity, which remains cheaper and faster to deploy in many US markets even if less aligned with clean-energy commitments.
