Yesterday we noted the difficulty of designing a data center that relies fully on solar power, given the energy demands of major data centers and capacity limitations of current solar technologies. Today Google (GOOG) announced that its foundation has made a $10 million investment in eSolar, which is working to develop “utility-scale” solar power.
eSolar [1] describes its approach as a “market disrupting solar thermal power plant technology.” Generation can be scaled from 25MW to over 500MW at energy prices competitive with traditional fossil fuels. The company, which ios based in Pasadena, Calif., intends to provide modular solar power plants that scale in increments of 25 megawatts.
Solar thermal power systems use reflected sunlight as a heat-source to drive electric generators. Unlike photovoltaic systems, which use semiconductor materials to directly convert sunlight into electrons, solar thermal systems use the sun’s heat to create steam to power electric generators.
This video [2] demonstrates how the technology works.
Solar thermal power [3] is not new, and is widely used widely used in residential applications, such as heating swimming pools. The largest example of solar thermal power is the
SEGS (Solar Electricity Generating Systems) [4] project in California’s Mojave desert, which used 2.5 million square meter array of parabolic reflectors to create a generating capacity of 354 MW.
eSolar’s approach uses a heliostat, an array of movable mirrors that can track the sun throughout the day and concentrate their heat on a collector tower. A
2003 study [5]commissioned by the National Renewable Energy Laboratory (NREL) found that tower technology is slightly cheaper to generate than the parabolic trough technology used at SEGS.
eSolar isn’t the only company developing large-scale thermal solar plants. In November, Palo Alto, Calif. startup
Ausra [6] announced plans to build a
177 MW thermal solar plant [7] in San Luis Obispo.
Can this technology be harnessed to power data centers? With Google’s massive data center network, the company has plenty of facilities where eSolar can prove its utility-scale generation technology.
Rich Miller is the founder and editor-in-chief of Data Center Knowledge, and has been reporting on the data center sector since 2000. He has tracked the growing impact of high-density computing on the power and cooling of data centers, and the resulting push for improved energy efficiency in these facilities.
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URL to article: http://www.datacenterknowledge.com/archives/2008/01/17/google-invests-in-utility-scale-solar-power-2/
URLs in this post:
[1] eSolar: http://www.esolar.com/
[2] This video: http://greenenergytv.com/Browse/Recent.aspx?1333254994
[3] Solar thermal power: http://en.wikipedia.org/wiki/Solar_thermal_energy
[4] SEGS (Solar Electricity Generating Systems): http://www.flagsol.com/SEGS_tech.htm
[5] 2003 study : http://www.nrel.gov/solar/parabolic_trough.html
[6] Ausra: http://www.ausra.com/
[7] 177 MW thermal solar plant: http://www.greentechmedia.com/articles/ausra-to-build-177-megawatt-solar-thermal-plant-266.html
[8] Rich Miller: http://www.datacenterknowledge.com/archives/author/richm/
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