Antora snags $550M for heat batteries to run data centers and factories

A California company called Antora Energy just raised $550 million to build more of its heat-storing batteries, which are used to power data centers and industrial plants rather than homes. The technology works by running electricity through a heater that warms giant blocks of solid carbon to very high temperatures. Those blocks later release the stored heat as light, which can be turned into power or steam for factories.

Antora recently started up its first large system at a biofuels plant in South Dakota, using cheap wind power to make steam for turning corn into ethanol, cutting the plant's reliance on coal boilers. With the new funding, the company plans to build a second U.S. factory and take on more large projects, including deals with data center operators and manufacturers in biofuels, chemicals, and food and beverage production.

This is industrial-scale technology, not something for individual houses. But it points to a broader shift: as data centers and factories strain the power grid, companies are turning to storage systems that soak up cheap or surplus electricity, often from wind or solar, and release it later as heat or power. That kind of demand management can ease pressure on the grid and, over time, may help slow the rise in electricity costs that utilities pass on to households. Antora is also testing special utility rate structures with a South Dakota utility designed to reward this kind of flexible energy use, an idea that could eventually show up in how utilities price power more broadly.