Singapore Sovereigns, CPP Investments Back Form Energy’s Iron-Air Battery Concept

By Mario Marroquin

Energy storage startup Form Energy raised US$540 million this week as part of a series E financing round led by San Francisco-based private equity firm TPG that included Singapore’s GIC and Temasek, and the Canadian Pension Plan Investment Board.

Form Energy, which aims to leverage reverse rust battery technology for energy storage, also secured financing from previous investors including Temasek, Bill Gates’ Breakthrough Energy Ventures and MIT’s The Engine, to name a few, in the latest round of fundraising.

“We look to invest in ambitious and innovative companies that are on track to make a meaningful impact in achieving net-zero in the real economy,” Choo Yong Cheen, chief investment officer of Private Equity at GIC, said in a statement. “Over the next decade, Form Energy’s low-cost, iron-air battery technology will unlock gigawatts of new renewable energy capacity and open the door to tremendous opportunities.”

Reverse rust batteries use oxygen and iron pellets to charge and discharge batteries. Unlike traditional energy storage assets, reverse rust batteries, otherwise known as iron-air batteries, do not use lithium to store energy.

According to Energy-Storage News, Form Energy has been contracted to supply a 1MW battery system with up to 150-hour duration for Great River Energy in Minnesota.  

The firm last raised funds in 2021 when it secured $240 million in Series D financing.

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