Thermo-solar power stations are gaining increasing interest as potential sources of renewable ("green") energy. These stations convert solar energy to heat, which can be used for the production of electricity. The new generation of thermo-solar power plants includes heat-storage units, enabling flexibility in electricity supply over time. Thermo solar stations with heat-storage capacity can provide electricity upon demand, even at night or on cloudy days. Heat storage in these stations makes use of molten salts- potassium and sodium nitrate. See Haifa K-Solar™ technical data