Where Rust Never Sleeps: $750M Series G Strengthens Iron-Air Battery Startup for U.S. Manufacturing Charge

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  "detected_at": "2026-08-14T18:33:52+00:00",
  "company": {
    "name": "Form Energy",
    "domain": "formenergy.com"
  },
  "data": {
    "url": "https://www.energytech.com/battery-innovations/news/55398215/where-rust-never-sleeps-750m-series-g-strengthens-iron-air-battery-startup-for-us-manufacturing-charge",
    "title": "Where Rust Never Sleeps: $750M Series G Strengthens Iron-Air Battery Startup for U.S. Manufacturing Charge - energytech.com",
    "excerpt": "The Massachusetts-based manufacturer operates multiple U.S. facilities, including a 550,000-square-foot iron-air battery manufacturing plant in Weirton, West Virginia and a research and development office in Berkeley, California. Form Energy is accelerating its commercial development of next-gen iron-air energy storage systems (ESS) to drive electricity for up to 100 hours. Form Energy notes that proceeds from the current round will be utilized to accelerate manufacturing at its Weirton Form Factory 1 site to scale deployment of its multi-day iron-air battery systems. Iron-air battery technology , which operates under the principles of reversible rusting, is gaining momentum as an LDES alternative to lithium-ion battery storage. Iron-air batteries utilize only iron, water and air - free of heavy metals and risks of thermal runaway - via a nonflammable, aqueous electrolyte solution. During discharge, the battery absorbs oxygen and converts iron metal to rust. During charging, an electrical current is applied to convert the rust back to iron, causing the battery to emit oxygen. Form Energy says these batteries cost one-tenth of the price of traditional lithium-ion technologies. Each battery module is grouped in a protected enclosure to form megawatt-scale power blocks that can connect directly to the electricity grid. This year, the company reportedly increased its backlog from...",
    "summary": "Form Energy entered into a strategic capacity agreement with Crusoe in March to deliver 12 GWh of iron-air batteries starting in 2027 to support AI power needs.",
    "planning": true,
    "image_url": "https://img.energytech.com/files/base/ebm/energytech/image/2026/08/6a7f5aa4ae42e1b4fe6265f5-ironairbatterymodulesontestinformenergysfacilityin.png?auto=format,compress&fit=fill&fill=blur&w=1200&h=630",
    "confidence": 0.9,
    "published_at": "2026-08-14T18:33:52Z",
    "effective_date": "2027-01-01",
    "article_sentence": "Crusoe entered into a strategic capacity agreement with Form Energy in March to deliver 12 GWh of iron-air to support rapidly growing AI power needs starting in 2027.",
    "related_company_name": "Crusoe",
    "related_company_domain": "crusoe.ai"
  }
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