Firebricks – or bricks made with clay able to endure temperatures of 1,600 degrees Celsius – have been around for at least 3,000 years. Now Massachusetts Institute of Technology (MIT) researchers are revisiting this ancient technology to potentially help us transition from fossil fuels to renewable energy. The researchers worked out a scheme where excess electricity, generated when the wind is blowing or sun is shining, could be converted into heat and stored in the firebricks for later use.
The firebricks technology has existed since the time of the Hittites, according to MIT researchers, who want to draw on this old technology to help make carbon-free power sources competitive with fossil fuels. Right now, with solar and wind power, electricity prices can collapse to near zero when there’s high wind or solar output, making those clean energy installations unprofitable unless companies can store power.
Their system, called Firebrick Resistance-heated Energy Storage, or FIRES, costs between one-tenth and one-fortieth as much as pumped hydroelectric systems or batteries. It works like this: electric resistance heaters convert that excess electricity to heat, which would be stored in a large mass of firebricks. If the firebricks are inside an insulated casing, they can store that heat for long periods of time. The heat could either be utilized for industrial processes or converted back to electricity later