New Iron Battery Could Replace Diesel Backup at Data Centers

Data centers power everything from your streaming shows to cloud storage, but there's a dirty secret keeping them running. Most rely on diesel generators for backup power, creating noise pollution and carbon emissions that frustrate nearby communities.

California startup Inlyte Energy thinks it has the answer. The company is rolling out iron-sodium batteries designed specifically for data centers, offering a clean alternative that matches diesel's reliability without the environmental headaches.

The technology addresses three big problems at once. Traditional lithium batteries can't provide backup power for long enough during extended outages. Diesel generators pollute and upset neighbors. And data centers need systems that can handle sudden power spikes without catching fire.

Inlyte's batteries check all those boxes. The company estimates they'll last 7,000 cycles, good for 20 years of daily use. Even better, the iron-sodium chemistry won't spark thermal runaway or explosions like lithium batteries can.

"Our technology actually has an intrinsic safety where cells themselves when they break or internally short, it doesn't lead to a thermal runaway situation," said Chief Commercial Officer Ben Kaun. That safety profile lets them pack the batteries tighter, fitting a gigawatt-hour of storage in just one acre.

The company has two major pilots launching in 2026. Swiss data center operator NTS Colocation will test a 600 kWh system at a facility in Bern. If successful, they'll scale up to 2 MW across multiple sites by 2028.

Southern Company, a southeastern utility, will run a separate yearlong evaluation at a test site in Wilsonville, Alabama. The utility's executives were impressed enough after seeing a UK demonstration last year to bring the technology stateside.

Timing couldn't be better. Microsoft has pledged to eliminate diesel generators by 2030, but data center operators have struggled to find practical replacements. CEO Antonio Baclig noted the industry wants alternatives but hasn't found options that match diesel's economics and duration.

The Ripple Effect

The push goes beyond just one company's innovation. Inlyte is partnering with Horien Salt Battery Solutions to open U.S. manufacturing with 2 GWh initial capacity. The batteries will contain 70% domestic content, with iron powder specially engineered by Ervin Industries.

Commercial shipments from the American facility should start in 2027. That domestic production could help accelerate adoption while creating manufacturing jobs.

As artificial intelligence and cloud computing drive data center expansion, finding clean backup power becomes more urgent. These iron-sodium batteries might finally give the industry a way to grow without leaving a trail of diesel exhaust.