Some links on the Concentrating Solar Power (CSP):
1. Gemasolar, the first commercial-scale plant in the world to apply central tower receiver and molten salt heat storage technology: http://www.torresolenergy.com/TORRESOL/gemasolar-plant/en
2. What is Concentrated Solar Power? http://www.torresolenergy.com/TORRESOL/concentrated_solar_power/en
3. Concentrating Solar Power at Sandia National Lab: http://energy.sandia.gov/index.php?page_id=2445
4. Power Tower Projects listed by NREL: http://www.nrel.gov/csp/solarpaces/power_tower.cfm