ArcelorMittal led the rechargeable battery developer's series D round with a $25m investment through its XCarb vehicle.

Form Energy, a US-based grid-scale battery developer, secured $200m yesterday in a series D round led by $25m from steel manufacturer ArcelorMittal’s XCarb innovation fund.

Founded in 2017 as Baseload Renewables, Form Energy develops low-cost battery systems that can store wind and solar energy from renewable energy systems for a long duration.

The company has produced a rechargeable iron-air battery capable of delivering electricity for 100 hours at costs competitive with conventional power plants and at less than one-tenth the…