World's first round-the-clock solar power plant (Gemasolar - a 15 megawatt solar power tower plant in Spain)

Eventually the plant will be able to supply 24hrs of uninterrupted production per day on most summer days, providing a higher annual capacity factor than most baseload plants such as nuclear power plants.

http://www.guardian.co.uk/environment/picture/2011/aug/19/gemasolar-parabolic-power-plant-spain

http://www.torresolenergy.com/TORRESOL/NewsTS/gemasolar-solar-power-plant-reaches-24-hours-of-uninterrupted-production