Slashing CO2

Founded: 2018

HQ: Berkeley, CA

Long-duration energy storage as cheap as natural gas.

Big Picture

Cheap, long-lasting storage is the key to carbon-free energy. Even as electricity from wind and solar power falls below the cost of existing fossil fuel plants, 100% renewable power will stay out of reach until we can smooth out energy supply when the wind dies down or cloudy skies block out the sun. Today, grid-scale storage relies on lithium-ion batteries, which are too expensive and short-lived to do the job.

How it Works

Antora is building an energy storage system with a cost of storage below $10/kWh. The system stores heat in extremely cheap raw materials and converts it back to electricity with a high-efficiency thermophotovoltaic heat engine. In its first application, Antora’s system will absorb excess electricity from wind and solar plants and store it for 10-100+ hours, feeding it back to the grid when demand rises.

Unfair Advantage

Antora has demonstrated the highest efficiency solid state heat engine in history. This superpower enables the deployment of energy storage so cheap that it competes with natural gas — a price point more than 10x lower than lithium-ion batteries. This will bring down the price of renewable energy with storage below the all-in cost of fossil fuel energy, thus enabling 100% carbon-free energy. 


Percent cheaper

than lithium-ion for >100 hours of storage


Andrew previously founded Dragonfly Systems, a power electronics startup acquired by Sunpower.


Before co-founding Antora, Justin completed a PhD in applied physics at Stanford University.


Before co-founding Antora, David completed a PhD in mechanical engineering at MIT.

Antora Energy recently demonstrated the world’s most efficient solid state heat engine

Stanford Tomkat Center for Sustainable Energy

How a new class of startups are working to solve the grid storage puzzle

MIT Technology Review

Inexpensive energy storage for a cheaper grid

Cyclotron Road