The Andasol plant uses tanks of molten salt as thermal energy storage to continue generating electricity, irrespective of whether the sun is shining or not.

The collectors installed have a combined surface area of 51 hectares (equal to 70 soccer fields); it occupies about 200 ha of land.

[7] Andasol has a thermal storage system which absorbs part of the heat produced in the solar field during the day.

This process almost doubles the number of operational hours at the solar thermal power plant per year.

[8] Each unit fully loaded storage system holds 1,010 MW·ht of heat, enough to run the turbine and produce electricity for about 7.5 hours at full-load, in case of overcast skies or after sunset.

[13] Under current government policy in Spain, solar-thermal electricity will receive a feed-in tariff of just under €0.27/kW·h for the next 25 years.