A home CAES system operates by converting excess electrical energy into compressed air, storing it, and later releasing it to generate electricity when needed. A pressurized air tank used to start a diesel generator set in Paris Metro Compressed-air-energy storage (CAES) is a way to store energy for later use using compressed air. At a utility scale, energy generated during periods of low demand can be released during peak load periods. While traditionally deployed in industrial settings, this technology is now scaling down to meet. At its core, Compressed Air Energy Storage Technology works on a fairly simple principle: use electricity to compress air, store it under pressure, and then release it later to generate power. Think of it like charging a giant “air battery. Electricity from the public grid.