A power tower system (see lead image) uses a large field of mirrors to concentrate sunlight onto the top of a tower, where a receiver sits. Then, the salt's heat is used to generate electricity through a conventional steam. In power tower concentrating solar power systems, a large number of flat, sun-tracking mirrors, known as heliostats, focus sunlight onto a receiver at the top of a tall tower. Concentrated solar power (CSP), also called concentrating solar power or concentrated solar thermal, involves systems that collect solar. Concentrating solar power (CSP) is naturally incorporated with thermal energy storage, providing readily dispatchable electricity and the potential to contribute significantly to grid penetration of high-percentage renewable energy sources.