Antora Energy has secured $550 million in funding to ramp up production of its thermal batteries, a technology designed to meet the surging electricity needs of data centers and heavy industries. The company says the investment will help it build out manufacturing capacity for a storage system that turns renewable electricity into heat and holds it for hours or days.
Why data centers need thermal storage
Data centers require round-the-clock power, and their energy consumption is growing fast as cloud computing and AI workloads expand. Thermal batteries can absorb excess renewable energy when it's cheap and abundant, then discharge it as heat or electricity when demand spikes. That makes them a potential alternative to lithium-ion batteries for long-duration storage, especially at utility scale.
Antora's system uses blocks of carbon material that are heated to over 1,500 degrees Celsius. The stored heat can be converted back to electricity via a heat engine or used directly as industrial heat. The company says this approach avoids the need for critical minerals like lithium and cobalt, which are often tied to supply chain and environmental concerns.
Heavy industry's heat problem
Industrial processes such as cement, steel, and chemical manufacturing require high-temperature heat that is typically generated by burning fossil fuels. Thermal batteries can supply that heat directly, cutting emissions without requiring factories to overhaul their equipment. Antora's technology targets this sector as a key market alongside data centers.
The funding round, one of the largest ever for a thermal battery startup, signals growing investor appetite for alternatives to conventional batteries in applications where duration and heat matter more than portability. The company did not name specific investors but described the round as oversubscribed.
What the $550 million will buy
Antora plans to use the capital to expand its manufacturing facility and accelerate deployment of its thermal battery units. The company has already demonstrated a pilot system and is now moving to commercial-scale production. It expects the expanded capacity to help it lock in contracts with data center operators and industrial customers.
The expansion comes as grid operators in several regions warn that data center growth could strain electricity supply. Thermal storage offers a way to add flexible capacity without building new gas plants or waiting years for transmission upgrades. Antora's system can be sited at or near the point of use, reducing the need for grid reinforcement.
The company has not disclosed a specific timeline for when the expanded production will come online, but it said the funding will allow it to begin fulfilling customer orders in the near term.
