Crescent Dunes project, Nevada
Around 17,500 mirrors focusing the sun's rays onto a receiver sat atop a 200 metre high tower filled with molten salt - thought to be the world's highest.
The salt is pumped up the tower at 260°C (500°F) where it is then heated by the sun to more than 565°C (1,050°F), before being stored in a tank. When needed, the thermal energy is released through a heat exchanger to create steam and power a turbine - meaning the site can continue to produce power in the evening when demand peaks.
But there is more to come. SolarReserve now holds the exclusive worldwide license to commercialise the technology, originally developed by Pratt & Whitney Rocketdyne, the company that lends NASA a helping hand with its rockets.
And, in November 2012, SolarReserve received final Approval for the larger 150MW Crossroads project, set to use the same technology along with 65MW of solar PV panels, which should be up and running at Gila Bend, Arizona, in 2016.