There’s often enough heat available, but not always at the right time or place. With high-temperature storage in sand aquifers or porous stone layers, you can store heat on a large scale, seasonally or for shorter durations. We call this technique HT-ATES. HT-ATES is commonly used in district heating networks with heat sources that can provide heat year-round, such as a geothermal system. However, it’s also possible to combine it with CHP (Combined Heat and Power), solar collectors, industrial waste heat, and conversion of electricity into heat. Typical temperatures range from 45 to 90°C, but there are also initiatives for storage up to 120°C.