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Response to longship (Reply #29)

Thu Jan 17, 2013, 07:56 PM

61. Solar Two was a start

 

now it's mothballed



Solar Two

One of Solar Two's heliostats is shown in 2003 with the solar power tower in the background

In 1995 Solar One was converted into Solar Two, by adding a second ring of 108 larger 95 m² (1,000 ft²) heliostats around the existing Solar One, totaling 1926 heliostats with a total area of 82,750 m² (891,000 ft²). This gave Solar Two the ability to produce 10 megawatts—enough to power an estimated 7,500 homes.

Solar Two used molten salt, a combination of 60% sodium nitrate and 40% potassium nitrate, as an energy storage medium instead of oil or water as with Solar One. This helped in energy storage during brief interruptions in sunlight due to clouds. The molten salt also allowed the energy to be stored in large tanks for future use such as night time—Solar Two had sufficient capacity to continue running for up to three hours after the sun had set.


Solar Two was decommissioned in 1999, and was converted by the University of California, Davis, into an Air Cherenkov Telescope in 2001, measuring gamma rays hitting the atmosphere. Its name is now C.A.C.T.U.S.. Solar Two's 3 primary participants were Southern California Edison (SCE), the Los Angeles Department of Water and Power (LADWP), and the U.S. Department of Energy (DOE).

"We're proud of Solar Two's success as it marks a significant milestone in the development of large-scale solar energy projects," said then U.S. Energy Secretary Bill Richardson.
"This technology has been successfully demonstrated and is ready for commercialization.
From 1994 to 1999, the Solar Two project demonstrated the ability of solar molten salt technology to provide long-term, cost effective thermal energy storage for electricity generation.", Boeing

On November 25, 2009, after 10 years of not producing any energy, the Solar Two tower was demolished The mothballed site was levelled and returned to vacant land by Southern California Edison. All heliostats and other hardware were removed.

http://en.wikipedia.org/wiki/The_Solar_Project

http://costofwar.com/

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