This story was updated at 3:13 p.m. EDT.
WASHINGTON
— A former NASA scientist has used radio waves to transmit solar power a
distance of 92 miles (148 km) between two Hawaiian islands, an achievement that
he says proves the technology exists to beam solar power from satellites back
to Earth.
John
C. Mankins demonstrated the solar
power transmission for the Discovery Channel, which paid for the four month
experiment and will broadcast the results Friday at 9 p.m. EDT. His vision is
to transmit solar power collected by orbiting satellites as large as 1,102 pounds (500 kg) to lake-sized receiver stations on Earth.
Mankins,
who worked at NASA for 25 years and managed the agency's space-based solar
program before it was disbanded, transmitted 20 watts of power between the two
islands in May. The receivers, however, were so small that less than one
one-thousandth of a percent of the power was received, Mankins said.
The
experiment cost about $1 million, and Mankins said larger
arrays could be constructed with more money.
Each
of the nine solar panels used was built to transmit about 20 watts of power,
but the transmission was scaled back to two watts per panel in order to obtain
U.S. Federal Aviation Administration approval for the test.
Despite
the miniscule reception on the receiving end, Mankins said the ground-based
test proved it is possible to transmit solar power through the atmosphere.
"The
test was in no way fully successful," he said. "I think it showed it
is possible to transmit solar power quickly and affordably."
The Discovery Channel will highlight the solar power beaming
experiment Friday, Sept. 12 in "Discovery Project Earth: Orbital Power Plant." Check
local listings.
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