The power towers at the Planta Solar 20 (PS 20), right, and the Planta Solar 10 (PS 10) concentrating solar power (CSP) projects. They are surrounded by fields of heliostats that reflect the sun's rays into the tower's capturing technologies. The PS 20 produces 20 megawatts of electrity and its tower, at 160 metres, is the world's tallest. The plant began electricity production in 2009 . Its predecessor, the PS 10, has a 115 metre tall tower and produces, since 2007, 11 megawatts of electricity. Both plants are operated by Abengoa Solar.