Main features
- rechargeable battery is most common electricity storage. Usually the capacity of a household battery storage is few hours of normal energy consumpion of a household.
- insulated water tank is most common thermal energy storage. Usually the capacity of a household thermal storage is from hours to days of households normal thermal energy consumpion.
- seasonal thermal energy storage can keep heat or cold up to several months. https://en.wikipedia.org/wiki/Seasonal_thermal_energy_storage
Additional features
- pumped hydroelectric storage is most common large scale electric energy storage. Low-cost energy is used to pump water from lower reservoir to upper reservoir. Energy is stored to gravitational (potential) energy of water. https://en.wikipedia.org/wiki/Pumped-storage_hydroelectricity
- power to gas is a technology that converts electricity to gas fuel. Gas fuel can be stored to pressurised tank. https://en.wikipedia.org/wiki/Power-to-gas
