This is what they invested in. Interesting concept fraught with uncertainty. Good for diversifying power generation, but not for replacing current generation.
Crescent Dunes Solar Thermal Tower: Leaks and Safety Hazards, Yet SolarReserve Wants to Build Ten More
September 29, 2017 - Tonopah NV - On September 5, we attended a meeting of the Nye County Commissioners in Tonoaph, which was also videocast in Pahrump. The CEO of SolarReserve, Kevin Smith, gave a talk in person about his ideas to construct and operate a larger series of solar power towers near the original power plant at Crescent Dunes. The new project is just in the idea stages and does not have a Power Purchase Agreement, or financing, and no environmental review has publically begun.
The Sandstone Solar Energy Project would entail building up to 10 more solar power towers, each with molten salt storage, and up to 2,000 megawatts of energy generation.
Yet problems have plagued the Crescent Dunes solar power tower, with apparent weld problems in the pipes, and a leaking molten salt tanks that caused skin irritation and breathing issues with employees recently (see the article by Daria Sokolova in the Pahrump Valley Times). Nitrous oxide gas is a hazardous byproduct of molten salt, which is made of sodium nitrate and potassium nitrate, and releases need ventilation or hazards to workers may result.
Crescent Dunes Solar Power Tower Back Online After 8 Month Repairs
July 30, 2017 - Tonopah NV - We noticed that the glowing sun-like light was brilliantly glowing again atop the 700-foot power tower out in the remote desert of central Nevada. Solar Reserve finally flipped the switch back on to their utlity-scale solar thermal power plant, which has molten salt tanks to store excess electricity generated after dark. Sources tell us the intense heat of this solar power plant–at a scale never attempted before–presented problems for pipes and welds. Vibrations of molten salt flowing through the pipes caused problems.
We have concerns with this type of technology due to the intense heat-energy created by sunlight bouncing off mirrors and concentrating at the tower receiver (where the molten salt is heated): the solar flux incinerates or injures birds which fly through it. Right now, swallows are flying about the desert in post-breeding movements. Other birds may also be active, such as lesser nighthawks. We will be monitoring the mortality reports since this power plant is on public land.
Also see the article in the Las Vegas Review-Journal.
Crescent Dunes Solar Power Tower Still Offline
February 4, 2017 - Ramping up is taking a lot longer than expected for the Crescent Dunes Solar Energy Project near Tonopah NV, as a small leak in the hot salt tank was found in December 2016. The power plant is still off a few months later. The molten salt tanks are used for thermal storage. The unprecedented size of the plant might account for the difficulties in the construction of the pipes, welds, and other parts with the extreme heat of the molten salt as it is heated by the sun in the receiver tower, and flows down into the storage tanks.
See http://pvtimes.com/tonopah/salt-leak-shuts-down-crescent-dunes-solar-plant-outside-tonopah