Torus Nova Spin uses spinning steel to power AI data centers without lithium

AI data centers burn through power in unpredictable bursts, and lithium battery arrays struggle to keep up — then wear out within a decade. Torus, a Salt Lake City energy startup, thinks a decades-old physics concept has the answer. Its new Nova Spin system stores energy in a spinning steel rotor rather than in chemical cells, and the company has already deployed it across 230+ US sites with 99.9% uptime.

The spin

Nova Spin works by accelerating a heavy steel rotor inside a sealed vacuum chamber on magnetic bearings. Surplus electricity spins the rotor up; when demand spikes, the rotor slows and a built-in generator pushes power back to the grid in milliseconds. A full charge-discharge cycle takes around 12 minutes, making it well suited to the short, sharp load swings that GPU clusters produce when AI workloads kick in.

The key claim: Nova Spin delivers 20 times the instantaneous power of a chemically equivalent battery pack. That headroom matters when a rack of NVIDIA GPUs goes from idle to full inference in seconds, drawing dozens of megawatts almost instantly.

Why this beats lithium for data centers

Traditional lithium arrays need replacement or major servicing after 7–10 years of heavy cycling. Torus says Nova Spin is rated for 25,000 cycles — roughly a 25-year lifespan — with no measurable capacity fade. There are no rare-earth metals and no toxic electrolytes; 95% of materials are recyclable.

The system runs at 800V DC natively, which aligns directly with modern AI server racks from NVIDIA and others. Skipping voltage conversion stages cuts energy losses that would otherwise quietly erode efficiency. Torus pairs Nova Spin with a lithium iron phosphate (LFP) battery module called Pulse; the flywheel absorbs rapid load swings so the chemical cells cycle less and last longer. Microsoft reported 40% lower total cost of ownership switching to a flywheel-based UPS — a figure that carries weight as data center electricity bills balloon.

The bigger picture

Torus raised $200 million from Magnetar Capital earlier this year and is scaling its GigaOne factory to 1 GW of production per quarter. A binding agreement with PacifiCorp covers 500 MW of demand-response capacity, signaling that utilities are taking the technology seriously beyond the data center fence.

For now, manufacturing and deployments are concentrated in North America. No UK or EU rollout has been announced, and pricing has not been disclosed publicly. If the lifecycle cost argument holds up at scale, flywheel storage could become a serious alternative to lithium for any operator planning infrastructure that needs to last well into the 2040s.