Assumption
City with 240,000 inhabitants, single and multi-family houses, industry and commerce
Dimension regryd
— Diameter / height: 40 m
— Volume: 50,000 m³
— Storage capacity: 25,000 MWh (Charging with electrical energy, e.g. from wind / PV, storage temperature 1,000 °C)
The city can be heated for 43 days with this amount of heat.