GM Partners With Startup on Safer, Cheaper Batteries

General Motors just made a bet on batteries that could make clean energy storage safer and more affordable for everyone.

The automotive giant announced a partnership with Peak Energy, a three-year-old California startup, to develop sodium-ion batteries for energy storage systems. Unlike the lithium-ion batteries that power our phones and electric cars, these batteries use sodium, the same element found in table salt.

"It's an abundant element," explains Cameron Dales, Peak Energy's co-founder and chief commercial officer. The difference matters because lithium-ion batteries rely on rare and expensive materials like lithium and cobalt, which drives up costs and creates supply chain headaches.

The new technology brings two major advantages. First, sodium-ion batteries are far less likely to catch fire, addressing one of the biggest safety concerns with current battery technology. Second, because sodium is so plentiful, these batteries should eventually become much cheaper to produce.

The catch? Sodium-ion batteries store less energy in the same amount of space, so you need bigger batteries to get the same power. But for stationary energy storage, where size matters less than for phones or cars, that's a fair tradeoff.

Peak Energy has already proven the technology works. The startup built a 3.1-megawatt-hour sodium-ion battery near Denver last year, demonstrating that the concept can scale beyond the lab. With about 125 employees split between California and Colorado, the company is now ready to expand.

The GM partnership gives Peak access to the automaker's Michigan battery lab and decades of manufacturing expertise. For GM, it's a chance to build an energy business beyond electric vehicles, especially since many carmakers now have more battery capacity than current EV demand requires.

The Ripple Effect

This collaboration signals a broader shift in how America approaches clean energy storage. While China's CATL, the world's largest battery maker, has already invested heavily in sodium-ion technology, the U.S. has lagged behind. Peak is one of only about a dozen American companies working on the technology.

Kurt Kelty, GM's vice president for battery and sustainability, believes "sodium-ion will be a defining chemistry for grid-scale energy storage systems." That matters because storing renewable energy efficiently is crucial for shifting away from fossil fuels.

Right now, sodium-ion batteries cost more than lithium-ion ones simply because lithium-ion has dominated the market for 30 years. But as production scales up and manufacturing improves, the economics should flip. Abundant raw materials plus decades of cost optimization could make sodium-ion batteries the go-to choice for storing solar and wind power.

The road ahead won't be easy. Natron Energy, one of Peak's competitors with 100 employees, shut down last year when funding ran out. The market share for sodium-ion batteries in North America is currently zero and will barely reach 1 percent by 2030, according to Benchmark Mineral Intelligence.

But every major technology shift starts small, and having GM's resources behind sodium-ion batteries could accelerate the transition.

For a startup founded just three years ago, partnering with one of America's largest automakers represents validation that safer, cheaper energy storage isn't just possible, it's coming.