Paul Brown reports in REneweconomy (5/5/14):
"The engineering challenge has been to design a system in which enough of the Sun’s heat can be stored to produce full power continuously even on cloudy days – and better still, all night. Many different designs have been tried, but finally a commercial plant in Spain seems to have cracked the problem, and as a result has won an award from a panel of independent judges.
"The Gemasolar plant near the Spanish city of Seville, built by Torresol Energy, can store enough heat to operate for 18 hours at full capacity without any additional power from the Sun. For many months of the year it can run for 24 hours a day. The plant is small by power station standards, producing 20 megawatts of electricity – enough for 25,000 homes, reducing carbon dioxide emissions by 30,000 tonnes a year."