Form Energy raises over $2B to scale iron-air batteries for multi-day energy storage

Form Energy, a US-based climate technology company, is scaling its iron-air battery technology to store renewable energy for multiple days. With over $2 billion in funding and commercial deals in place, including a project to power a Google data center, the company aims to address intermittency challenges in wind and solar energy. However, scaling production to meet commitments remains a hurdle.

Tarun Mottlia

Editor, Lazyfounder

Published Oct 6, 20264 min read

Form Energy raises over $2B to scale iron-air batteries for multi-day energy storage — Image: MIT Technology Review via source

30 SEC SUMMARY

Form Energy, a US-based climate tech company, is developing iron-air batteries capable of storing energy for 100 hours to address renewable energy intermittency.
The company has secured over $2 billion in funding and signed commercial deals with utilities, including a project to power a Google data center in Minnesota.
Form Energy’s batteries use a reversible rusting process and aim to cost $20 per kilowatt-hour, making them competitive with natural gas.
Production capacity currently lags behind commercial commitments, with only 2 gigawatt-hours per year compared to 80 gigawatt-hours promised.
The technology requires significant physical space, with large-scale installations needing dozens of acres.

Form Energy’s iron-air battery technology
Funding and scaling challenges
Broader context: AI and energy demand
What this means
Key takeaways
FAQ
Sources

KEY HIGHLIGHTS

Form Energy is developing iron-air batteries capable of storing energy for 100 hours.
The company has secured more than $2 billion in funding, including state and federal grants.
First commercial project: a 150 megawatt-hour system for Great River Energy in Minnesota, launching in 2027.
Signed a deal with Xcel Energy to power a Google data center using 30 gigawatt-hours of its batteries.
Batteries require significant space—its Google installation may span at least 75 football fields.

Form Energy’s iron-air battery technology

According to MIT Technology Review, Form Energy is developing iron-air batteries designed to store energy for multiple days. The technology uses a process called "reversible rusting," where oxygen converts iron to rust during discharge and reverses the process during charging. This approach aims to address intermittency issues in renewable energy sources like wind and solar.

The company’s first commercial deployment is a 150 megawatt-hour system for Minnesota-based electricity provider Great River Energy, scheduled to come online in 2027. Form Energy has also signed a deal with Xcel Energy to supply 30 gigawatt-hours of its batteries to power a new Google data center, using wind and solar energy.

Form Energy aims to achieve a cost of $20 per kilowatt-hour for its battery systems, positioning them as a cost-competitive alternative to natural gas-based solutions.

Funding and scaling challenges

Form Energy has raised more than $2 billion in financing, including state and federal grants, to support its expansion. However, its current production capacity is just 2 gigawatt-hours per year, a fraction of the 80 gigawatt-hours it has committed to through commercial agreements.

The physical footprint of the batteries is substantial. According to MIT Technology Review, the company’s installation for Google’s data center could require at least 75 football fields of space, as the system needs an acre for every two to three megawatts.

Broader context: AI and energy demand

The rise of AI has increased demand for electricity, delaying coal plant closures and leading to new natural gas projects, according to MIT Technology Review. Form Energy’s technology could help mitigate this trend by enabling renewables to meet more of the electricity demand from data centers and other high-consumption facilities.

What this means

Lazyfounder analysis — our interpretation, not reported fact.

Form Energy’s iron-air battery technology could be a game-changer for renewable energy storage, particularly as demand for grid stability grows with the expansion of AI and data centers. The promise of multi-day storage at a competitive cost addresses a critical gap in decarbonizing energy systems. However, scaling production to meet commercial commitments will be a significant challenge. If successful, this could reduce reliance on fossil fuel-based backup power and accelerate the transition to renewables.

Key takeaways

Form Energy’s iron-air batteries store energy for 100 hours, targeting intermittency issues in renewable energy.
The company has raised over $2 billion and secured deals with utilities like Great River Energy and Xcel Energy.
Its first commercial project, a 150 megawatt-hour system, is set to launch in 2027 in Minnesota.
The batteries aim to cost $20 per kilowatt-hour, competing with natural gas alternatives.
Production capacity is currently far below commercial commitments, posing a scaling challenge.
Large-scale installations require significant land, with the Google project needing at least 75 football fields.

FAQ

What is Form Energy’s battery technology?

Form Energy is developing iron-air batteries that use a reversible rusting process to store energy for up to 100 hours. This technology is designed to provide long-duration energy storage for renewable sources like wind and solar.

Who are Form Energy’s customers?

Form Energy has signed commercial deals with utilities including Great River Energy and Xcel Energy. Its batteries will be used to power a Google data center in Minnesota.

How much has Form Energy raised?

Form Energy has raised over $2 billion in financing, including grants from state and federal sources.

What are the challenges Form Energy faces?

The company’s production capacity is currently far below its commercial commitments, and its battery systems require significant physical space for large-scale installations.

How could Form Energy’s technology impact AI energy demand?

Form Energy’s batteries could help reduce emissions from AI data centers by enabling renewables to meet more of their electricity demand, potentially reducing reliance on fossil fuel-based backup power.

Related on Lazyfounder

Sources

MIT Technology Review · 2026-10-06
Form Energy and its iron batteries

This story is an original summary drafted with AI by Lazyfounder from the reporting listed above and checked by automated validation. Facts are attributed to their original publishers; sections marked as analysis are Lazyfounder's. Where a source is in another language, facts were machine-translated and quotations are reported, not reproduced. Read the original coverage via the links, and see our AI policy and corrections policy.

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