Model rendering of ISEGS, the world's largest solar power
tower being built in California
Google has chipped in a US$168 million investment in what
will be the world's largest
solar power tower plant. To be located on 3,600 acres of
land in the Mojave Desert in southeastern California, the
Ivanpah Solar Electric Generating System (ISEGS) will boast
173,000 heliostats that will concentrate the sun's rays onto a
solar tower standing approximately 450 feet (137 m) tall. The
plant commenced construction in October 2010 and is expected to
generate 392 MW of solar energy following its projected
completion in 2013.
Although solar power tower development is currently less
advanced than the more common trough systems, they offer higher
efficiency and better energy storage capabilities. Parabolic
trough systems consist of parabolic mirrors that concentrate
sunlight onto a Dewar tube running the length of the mirror
through which a heat transfer fluid runs that is then used to
heat steam in a standard turbine.
Solar power tower systems such as the ISEGS on the other hand
focus a large area of sunlight into a single solar receiver on
top of a tower to produce steam at high pressure and
temperatures of up to 550 ° C (over 1,000° F) to drive a
standard turbine and generator. The ISEGS also uses a
dry-cooling technology that reduces water consumption by 90
percent and uses 95 percent less water than competing solar
thermal technologies. Water is also recirculated during energy
before being reused to clean the plant's mirrors.
Overshadowing the 20 MW
PS20 solar power tower plant in Spain, the scale of ISEGS
can't be overstated. It will be the first large-scale solar
power tower plant built in the U.S. in nearly two decades and
will single-handedly almost double the amount of commercial
solar thermal electricity produced in the U.S. today and nearly
equal the amount of total solar installed in the U.S. in 2009
alone.
The entire complex will consist of three separate plants
developed by
BrightSource Energy that will be built in phases between
2010 and 2013. The energy generated from all three plants will
be enough to supply more than 140,000 homes in California during
peak usage hours, with the project contracted to provide 1,300
MW to Southern California Edison and 1,310 MW to Pacific Gas and
Electric Company.
Google says it has now invested over $250 million in the
clean energy sector but its $168 million investment in the ISEGS
is the company's largest investment to date. The size of the
investment reflects Google's faith in the technology and it
hopes that other companies will follow its example and make
similar investments in renewable energy.
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