Metal-air batteries: Economics

A USD 2 billion bet on rare multi-day blackouts

What this tab covers Economics and financial structure: capital versus operating cost, levelised cost of storage, and how the asset earns money.

The iron-air investment case is a bet on very low cost per kWh for rare multi-day events. Form has raised more than USD 2 billion and reports an 80 GWh backlog, but publishes no current cost or LCOS; its first utility system was still being completed in late 2026, and its Aug 2026 round was reportedly at a lower valuation.

Capex versus opex

Mixed

Form does not disclose current costs; its target is USD 20 per kWh, which it says would compete with natural gas. That is about one-eighteenth of the PNNL 2021 estimate for a 10-hour lithium iron phosphate system (USD 356/kWh, ratio calculated). Operating costs will depend on charging power, because low efficiency multiplies the cost of each MWh bought. Form raised a USD 750 million Series G led by T. Rowe Price in Aug 2026, taking total equity above USD 2 billion; Axios reported a pre-money valuation of USD 1.75 billion, down from about USD 3 billion in Oct 2024 (not confirmed by Form).¹¹⁴¹⁶

Form cost target USD 20/kWh¹ LFP 100 MW / 10 h installed cost, 2021 USD 356/kWh¹⁴ Form Series G (Aug 2026) USD 750 million; total equity over USD 2 billion¹¹⁶ Reported pre-money valuation USD 1.75 billion (about USD 3 billion in Oct 2024)¹⁶

Levelised cost of storage

Mixed

No independent LCOS for iron-air was found. Classic LCOS per MWh flatters frequently cycled batteries and penalises multi-day stores expected to discharge only 25 to 43 times a year, so iron-air is better compared on cost per MW of firm capacity against a new gas peaker, which Lazard puts at USD 144 to 276/MWh of output in the US in 2026. For 4-hour lithium-ion Lazard gives USD 210 to 292/MWh (2026).²¹²

Gas peaker LCOE, US 2026 USD 144-276/MWh¹² Lithium-ion LCOS, 100 MW / 4 h, 2026 USD 210-292/MWh¹² Iron-air cycles per year (expert estimate) 25-43²

Revenue stack and market participation

Mixed

Revenue is mainly capacity or resource adequacy: covering several days of low wind or solar. Arbitrage revenue is limited by low efficiency and few cycles. Large buyers want firm clean supply: in Feb 2026 Xcel Energy and Google announced 300 MW / 30 GWh of Form batteries for a Minnesota data centre, alongside 1.6 GW of new wind and solar, subject to Minnesota regulatory approval, with first modules due to ship by end 2028 and phased operation to 2031. Aluminium-air targets a different market: backup power and range extension for vehicles, plus telecom towers.¹⁶⁷¹⁶¹⁷

Xcel-Google plan 300 MW / 30 GWh; first modules by end 2028, phased to 2031¹¹⁷ Form commercial backlog (company figure) About 80 GWh (up from about 20 GWh earlier in 2026)¹¹⁶

Sources

15 Climate Tech Companies to Watch 2026: Form Energy (6 Oct 2026) MIT Technology Review, 2026
100-hour LDES battery technologies from Form, Noon and Ore: how do they compare? (cites Form presentations and a LinkedIn commentator) Energy-Storage.news, 2025
Indian Oil's aluminium-air battery manufacturing JV readies itself for manufacturing rollout Autocar Professional, 2023
Hindalco, Phinergy and IOP partner on revolutionary aluminium-air batteries for EVs and energy storage (press release, 18 Jul 2022) Hindalco Industries, 2022
Lazard's Levelized Cost of Energy+ (LCOE+), July 2026 (LCOS v11.0 key assumptions p. 38; LCOE v19.0 assumptions p. 28) Lazard, 2026
2022 Grid Energy Storage Technology Cost and Performance Assessment (PNNL-33283), Executive Summary p. vii Pacific Northwest National Laboratory for US Department of Energy, 2022
Iron-air US LDES startup Form Energy secures US$750 million Series G financing (Aug 2026) Energy-Storage.news, 2026
World's largest grid battery part of Google, Xcel Energy agreement (4 Mar 2026) Utility Dive, 2026