What Happened

Google completed a $1 billion investment in Form Energy, a Massachusetts-based startup that has developed battery technology capable of storing energy for 100 hours—far longer than conventional grid batteries. The investment represents one of the largest single funding rounds in the energy storage sector and will enable Form Energy to scale production of its iron-air battery systems.

Form Energy’s technology stands apart from traditional lithium-ion batteries used in most grid storage applications. While conventional grid batteries typically provide 4-6 hours of energy storage, Form Energy’s iron-air systems can discharge power continuously for over four days. This extended duration addresses a critical gap in renewable energy infrastructure: what happens when the sun doesn’t shine and wind doesn’t blow for extended periods.

The startup plans to use the Google funding to accelerate manufacturing and deployment of its battery systems ahead of a potential public offering next year. Form Energy has already secured contracts for several grid-scale projects and is working with utilities across the United States to integrate long-duration storage into their renewable energy portfolios.

Why It Matters

Long-duration energy storage represents the “holy grail” for renewable energy adoption. Solar panels and wind turbines can generate abundant clean electricity, but their intermittent nature has limited their ability to replace fossil fuel power plants that provide reliable baseload power around the clock.

Current lithium-ion battery systems, while effective for short-term grid balancing, cannot economically store energy for the multi-day periods when renewable generation falls short of demand. This limitation has forced utilities to maintain natural gas “peaker” plants as backup power sources, undermining the environmental benefits of renewable energy investments.

Form Energy’s 100-hour storage capability could eliminate the need for these fossil fuel backup systems. By storing excess renewable energy during peak generation periods and releasing it during extended low-generation periods, these batteries could make renewable energy truly viable for baseload power generation.

Google’s massive investment signals growing corporate confidence in long-duration storage technologies and reflects the tech giant’s commitment to achieving carbon neutrality across its operations. The company has been investing heavily in renewable energy to power its data centers and cloud computing infrastructure.

Background

Form Energy emerged from MIT research and was founded in 2017 to commercialize iron-air battery technology. Unlike lithium-ion batteries that use expensive materials like cobalt and nickel, iron-air batteries rely on abundant, low-cost iron and oxygen from the air to store and release energy.

The technology works by oxidizing iron pellets during charging (storing energy) and reducing iron oxide back to iron during discharge (releasing energy). While this process is slower and less energy-dense than lithium-ion systems, it can maintain charge for much longer periods at a fraction of the cost.

Form Energy has raised over $350 million in previous funding rounds from investors including Breakthrough Energy Ventures (Bill Gates’ climate fund), ArcelorMittal, and others. The company has built a demonstration facility in Minnesota and is developing its first commercial-scale manufacturing plant.

The renewable energy storage market has experienced explosive growth as solar and wind costs have plummeted over the past decade. However, the lack of affordable long-duration storage has remained the primary barrier to widespread renewable energy adoption for baseload power generation.

What’s Next

Form Energy plans to use Google’s investment to scale production and accelerate deployment of its iron-air battery systems. The company is targeting initial commercial deployments within the next two years, with plans to build multiple gigawatt-scale manufacturing facilities.

The startup is preparing for a potential IPO in 2027, which could value the company at several billion dollars and provide additional capital for global expansion. Success in scaling iron-air battery technology could position Form Energy as a major player in the rapidly growing energy storage market.

Utilities and renewable energy developers are closely watching Form Energy’s progress, as successful deployment of 100-hour storage systems could fundamentally change how electrical grids are designed and operated. If the technology proves viable at scale, it could accelerate the retirement of fossil fuel power plants and enable much higher levels of renewable energy penetration.

Competing long-duration storage technologies, including compressed air, pumped hydro, and other battery chemistries, are also vying for market share in this emerging sector. The success of Form Energy’s approach could influence billions of dollars in future energy infrastructure investments.