Skip to Content
Climate change and energy

Long-lasting grid battery

Cheap, long-lasting iron-based batteries could help even out renewable energy supplies and expand the use of clean power.

February 23, 2022
Concept illustration of a long-lasting grid battery
Andrea D'aquino

Key players

ESS, Form Energy

 

Availability

Now

For a few seconds on a sunny afternoon last April, renewables broke a record for California’s main electric grid, providing enough power to supply 94.5% of demand. The moment was hailed as a milestone on the path to decarbonization. But what happens when the sun sets and the breeze stops?

Handling the fluctuating power production of renewables will require cheap storage for hours or even days at a time. New types of iron-based batteries might be up to the task.

Oregon-based ESS, whose batteries can store energy for between four and 12 hours, launched its first grid-scale projects in 2021. Massachusetts-based Form Energy, which raised $240 million in 2021, has batteries that store power for up to 100 hours. Its first installation will be a one-megawatt pilot plant in Minnesota, slated to be completed in 2023. 

Both companies rely on batteries that use iron, one of the most abundant materials on the planet. This means that their offerings could eventually be cheaper than other grid storage candidates, like lithium-ion and vanadium flow batteries. Form says its batteries could ultimately cost just $20 per kilowatt-hour, lower than even optimistic projections for lithium-ion batteries in the next several decades. 

There are still challenges to address: iron batteries typically have low efficiency, meaning a good fraction of the energy that’s put into them can’t be recovered. Unwanted side reactions can also degrade them over time. But if iron-based batteries can be deployed widely, at a low enough cost, they could help power more of the world with renewable energy.

As part of our 10 Breakthrough Technologies series, learn about ESS's ambitious plans to install iron batteries for grid storage around the world.

Deep Dive

Climate change and energy

The problem with plug-in hybrids? Their drivers.

Plug-in hybrids are often sold as a transition to EVs, but new data from Europe shows we’re still underestimating the emissions they produce.

Harvard has halted its long-planned atmospheric geoengineering experiment

The decision follows years of controversy and the departure of one of the program’s key researchers.

Why hydrogen is losing the race to power cleaner cars

Batteries are dominating zero-emissions vehicles, and the fuel has better uses elsewhere.

Decarbonizing production of energy is a quick win 

Clean technologies, including carbon management platforms, enable the global energy industry to play a crucial role in the transition to net zero.

Stay connected

Illustration by Rose Wong

Get the latest updates from
MIT Technology Review

Discover special offers, top stories, upcoming events, and more.

Thank you for submitting your email!

Explore more newsletters

It looks like something went wrong.

We’re having trouble saving your preferences. Try refreshing this page and updating them one more time. If you continue to get this message, reach out to us at customer-service@technologyreview.com with a list of newsletters you’d like to receive.