2. Cambridge Energy Storage Project
Heatmap Illustration/Form Energy
Type: Energy storage
Developer: Form Energy and Great River Energy
Location: Cambridge, Minnesota
Size: 150 megawatt hours
Operation date: End of 2025
Cost: Unknown; Goal of less than 1/10th cost of utility-scale lithium-ion batteries per megawatt hour
Why it matters: Form Energy first made waves in 2020 when it announced a contract with Great River Energy, a Minnesota electric utility, to build a battery that could store 100 hours’ worth of electricity, which was simply unheard of. Other energy storage companies were just trying to break the 4-hour limitation of lithium-ion, aiming for 8 hours or, at most, 12. Days-long energy storage would be a game changer for maintaining reliability during extreme weather events, storing renewable energy for stretches of cloudy days or windless nights or kicking in when demand peaks. At first, Form’s project was shrouded in mystery. How, exactly, would it do this? But a year later, the company revealed the secret chemistry behind its breakthrough: iron and oxygen. The batteries are filled with iron pellets that, when exposed to oxygen, rust, releasing electrons to the grid. They “charge” by running in reverse, using the electrical current from the grid to convert the rust back to iron.
Since then, the hype has continued to build. Form has raised nearly $1 billion from venture capital and been awarded tens of millions more ingovernment grants. It has signed contracts with six utilities to deploy projects in California, New York, Virginia, Georgia, and Colorado, in addition to Minnesota. All this, despite not having completed a single project yet.
The Great River Energy Project is set to be the first to come online. Originally, the company said it would be operating by the end of 2023; now it’s expected to start construction later this year and begin operating in early 2025, Vice President of Communications Sarah Bray told Heatmap. First, the company has to complete construction of its first factory in Weirton, West Virginia, where it will be producing all of the batteries. Bray said it expects to start high-volume production later this year.
May 17, 2024