Form Energy raises US$450 million for 100-hour iron-air ‘rust’ battery technology

https://www.energy-storage.news/form-energy-raises-us450-million-for-100-hour-iron-air-rust-battery-technology/

"100 hours energy storage... reversible oxidation aka rusting, of iron as battery discharges applying electrical current... converts the rust back to iron, emitting oxygen... pilot project was announced in 2020, with Form set to supply a 1MW battery system with up to 150 hours duration to Great River Energy"

Related:

Could Iron Be the Solution for Renewable Energy Storage?

https://eepower.com/market-insights/could-iron-be-the-solution-for-renewable-energy-storage/#

Form Energy selects West Virginia for its first iron-air battery plant

https://www.renewableenergyworld.com/storage/form-energy-selects-west-virginia-for-its-first-iron-air-battery-plant/

Form Energy's ultra-cheap iron-air batteries to get $760M factory

https://newatlas.com/energy/form-energy-iron-battery-plant/

Xcel gets $20 million for batteries to store solar, wind power

https://www.mprnews.org/story/2023/05/01/xcel-gets-20-million-for-batteries-to-store-solar-wind-power

Iron-Air grid battery is going to make real impact. First gigasite under construction

https://innovationorigins.com/en/iron-air-grid-battery-is-going-to-make-real-impact-first-gigasite-under-construction/

Modeling multi-day energy storage in New York