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Las Vegas to light up with solar

By | November 19, 2010, 4:00 AM PST

The Department of Interior gave the okay for another huge solar project on federal land earlier this week. The first such approvals for renewable energy on public land came earlier this fall and are destined for the deserts of southern California. This one is headed for Nevada.

Solar Millennium’s 500-megawatt Amargosa Farm project consists of two concentrated solar thermal plants. Their parabolic troughs direct sunlight to heat a fluid medium within a tube to more than 700 degrees Fahrenheit in order to generate steam and power large turbines. Some of the electricity generated via the sun reflecting off thousands of acres of mirrors would help power the many A/Cs, slot machines, casino facades, and fountains of “Sin City.” It all sounds so shiny.

But not all bets have cleared for the German company. They still need:

  • Pending DOE loan guarantees (set to expire December 31)
  • A power purchase agreement with Nevada utility NV Energy
  • EPA approval under the Clean Water Act (pertaining to the Armagosa River)

Solar Millennium’s CEO Josef Eichhammer addresses some of these concerns in a statement:

Our decision to plan a power plant with dry cooling also helps to accelerate the approval process, as we need 90% less water to cool the steam cycle. We will now intensify our negotiations with utilities regarding the power purchase agreements as well as our engagement with the permitting authorities for the two plants, so we will be able to commence construction for both projects by the end of 2011.

The company’s original plan, the NY Times reported last year, was to use a cooling method that would consume 1.3 billion gallons of water annually. After some public outcry over the region’s limited water supply, the BLM, Fish and Wildlife Service, and National Park Service began working with Solar Millennium on strategies to shrink its footprint, ecologically and physically. The solar farm’s water use now, according to the BLM, should not affect the wetlands within nearby Ash Meadows National Wildlife Refuge. The two plants will also cover about 1,300 acres less than previously planned (from 7,630 to 6,320 acres). Nye County’s property taxes on the plants will come to $13.9 million each year.

While Nevada’s Amargosa Valley, about 80 northwest of Las Vegas, is typically a sunny place, each plant’s solar thermal technology can store the sun-generated energy for 4.5 hours in the case of cloudy days or at night. To improve the Nevada’s grid for incoming renewable energy projects, the state broke ground just last month on a new 235-mile transmission line running south-north between Las Vegas and Ely.

Nevada hopes to achieve a 25 percent Renewable Portfolio Standard by 2025.

Related on SmartPlanet:

Images: Solar Millennium

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Melissa Mahony

About Melissa Mahony

Melissa Mahony was a contributing editor for SmartPlanet from 2010 to 2011.

Melissa Mahony

Melissa Mahony

Contributing Editor, Energy

Melissa Mahony has written for Scientific American Mind, Audubon Magazine, Plenty Magazine and LiveScience. Formerly, she was an editor at Wildlife Conservation magazine. She holds degrees from Boston College and New York University's Science, Health, and Environmental Reporting Program. She is based in New York.

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Melissa Mahony

Melissa Mahony

Melissa does not have financial holdings that would influence how or what she covers. She currently works for the Wildlife Conservation Society as an editor. Should Melissa cover a topic in which the WCS is involved, she will disclose this fact in her writing.

She writes for SmartPlanet and is not an employee of CBS.

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+1 Vote
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RE: Las Vegas to light up with solar
Excellent! Meanwhile thousands of rooftops remain open, waiting for solar PV to be treated equally under tax code and state/utility incentive programs for both commercial (think George Soros investments) and residential systems. Currently the deck is grossly tilted towards large utility-scale projects with huge tax incentives, outrageously business friendly (vote for me incentives) depreciation schedules, and permitting.

Further, these mega-watt utility-scale plants place a massive burden on an already strained transmission and distribution infrastructure. Point-of-load distributed PV systems are significantly better for the environment.
Posted by jpouchet
19th Nov 2010
+1 Vote
+ -
Why cool with water?
Cooling to water is inefficient and wastes solar power in projects like this.

You would think an efficient solar water heating system would want the water in the return from the generator to be as hot as possible. Sending hot water, condensed after running the steam turbine, back to the collectors would minimize the amount of solar reheating needed.

You could either increase the pressure of the system to pass more water because of the shortened heating time required or you could keep lower pressures and have temperature controlled outlets that would dump the water back to the generator when it hit the needed temperature rather than run it through the entire collector system unnecessarily.

Lower operating pressures would also improve the longevity of the system and simplify maintenance so you would think they would go with a variation of the latter plan to lower operating costs.

The bottom line of an efficient solar hot water system is to heat as much water as possible to the required temperature during daylight hours. The more water you heat per acre the more turbines you can run.

I saw MIT demo a compact system in Boston that was a self-contained solar hot water heating dish that ran a small steam turbine. The concept was that you could link hundreds of them to make a power farm or put one in your backyard or on your rooftop.

They even put small solar cells around the dish to automatically power up the fluid pump as soon as the sun came up. During the day the cells recharged the system batteries and ran the pump. Again, because of the low pressure and reduced piping they were able to reduce the pump size and lower its power needs.

Being self contained it could also be deployed solo or in clusters for power at disaster sites.

Being cookie cutter in design you could easily mass-produce them to keep cost reasonable. The design would also be ripe for evolutionary changes that a more efficient pump, solar cell or other component could be plugged into the production line quickly.
Posted by Hates Idiots
19th Nov 2010
+1 Vote
+ -
RE: Las Vegas to light up with solar
"cooling method that would consume 1.3 billion gallons of water annually"

the article should also mention the amount of water usage from the powergrid before using the solarenergy, the comparison of energy usage of the whole chain is important!!!
Posted by manox1
19th Nov 2010
+1 Vote
+ -
Back to the root question manox1. Why use water anyway?
An efficient use of solar power would not need to cool excess heat.

You could take the water consumption of the current power generating method and reduce it to 0 with an efficient solar design.

If the current solar design needs a cooling loop using 1.3 billion gallons of water a year than you are wasting the solar heat that warmed that water.

Not very efficient for a power source that already has a reputation for inefficiency.
Posted by Hates Idiots
22nd Nov 2010
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