Alcoa lowers solar power costs with special coated
mirrors
Mar 19 - McClatchy-Tribune Regional News - Joe Napsha The Pittsburgh
Tribune-Review
Alcoa Inc. said Thursday that it has developed an aluminum-based, solar
power generation system -- designed, built and tested in its Upper
Burrell technical center -- that produces energy cheaper than solar
power systems using glass mirrors.
Based on tests conducted at Alcoa Technical Center, the solar power
system using the specially coated aluminum mirrors lowers the cost of
generating electricity by more than 20 percent over conventional systems
that use silvered glass mirrors, said Eric F. Winter, director of
Alcoa's development laboratories.
The concentrated solar power system was shipped in January from Alcoa
Technical Center to Colorado after Alcoa worked for about two years on
designing, constructing and testing it, Winter said. About 50 people
worked on the project since it began in early 2008, with a core group of
about a dozen workers.
Alcoa, which has its corporate center on Pittsburgh's North Shore,
developed the system in conjunction with the National Renewable Energy
Laboratory in Golden, Colo., where the system is undergoing "validation
tests" to determine its efficiency and structural performance. The
Department of Energy gave Alcoa a $2.1 million grant to develop the
project.
Test results are expected to be available this spring, and the
system then would enter its next level of large-scale testing, Alcoa
said.
It might take two to three years of testing before the system can be
commercialized, Alcoa spokeswoman Judy Chestnutt said.
Alcoa's concentrating solar power parabolic trough consists of two
aluminum mirrors, 20 feet high and 46 feet long, that reflect and focus
sunlight on an oil-based fluid inside a tube connected to the hot side
of a power plant. The heated fluid -- reaching temperatures ranging from
600 to 700 degrees -- produces steam to turn a turbine at a utility
company's power plant, Winter said.
A concentrating solar power system like Alcoa's would be installed in a
"solar power park," with the number of units depending on the size of
the park, said Monique Hanis, a spokeswoman for the Solar Energy
Industries Association, a Washington-based trade group.
A typical solar park produces enough power for 200 households annually
for each 5 to 10 acres it covers.
Alcoa's project is one of about 100 utility-scale solar power projects
being developed, many of which use parabolic troughs such as Alcoa's,
Hanis said. Those projects use concentrating solar power technology, as
well as silicon photovoltaic solar panels produced by companies such as
Solar Power Industries Inc. of Rostraver.
Projects are moving toward commercialization. Federal funds in the 2009
stimulus package are helping the solar power industry to scale up
faster, Hanis said.
One megawatt from a solar park can power about 200 homes.
"More than 200 megawatts of solar power will come online in 2010," Hanis
said.
Joe Napsha is a Pittsburgh Tribune-Review staff writer and can be
reached at 724-836-5252 or via e-mail.
(c) 2010,
McClatchy-Tribune Information Services
|