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Due to an information I received, the world’s biggest ice storage project was realised in Hamburg in Germany in 2012. A Swiss company delivered the most efficient solar tubes collectors to power the whole.

The system is based on the phenomenon of crystallization energy: This energy is released in the form of heat, when the water changes its aggregate state from liquid to solid, i.e. changed when it freezes. 126 liters water if concealing to ice release an energy-amount of one liter of heating oil. The ice in a renewable process can be warmed and re-used for concealing into ice. With heat pump and heat exchanger this energy can be used in the home. (Article 20th of May 2015, Kreisbote Landsberg, page 19)