SACRAMENTO — Pacific Gas & Electric Co. for decades has generated power for its customers by splitting atoms, burning natural gas and capturing the force of falling water. More recently, the San Francisco utility began turning to the sun, wind, boiling geysers and even fermented cow manure to produce electricity.
Now, PG&E wants to turn to outer space.
A Manhattan Beach start-up called Solaren Corp. seeks to launch an array of giant solar power collectors into orbit 23,000 miles above Fresno and beam the energy to Earth. PG&E has signed a contract to buy the power -- if Solaren can make the technology work.
The proposal is a potential energy game-changer, supporters say. But, critics dismiss it as pie in the sky.
The scheme highlights a growing dispute as utilities struggle to meet ambitious requirements for energy from renewable sources: Should electricity come from big, bold projects such as huge desert fields of sunlight-reflecting mirrors or should it come from smaller, close-to-the-user efforts such as rooftop solar panels? Should big power companies handle electron delivery or do-it-yourselfers?
Solaren won't discuss the details or costs of its plan, other than to give a ballpark price tag at more than $2 billion, to generate enough electricity for 150,000 homes across much of Northern and Central California. It has asked utility regulators to keep the information confidential, for now.
But executives say that by 2016 they can put together the technology to harness energy that constantly bathes Earth from 93 million miles away.
"If our numbers are anywhere near where we think they will be, we will be able to provide power at a cost that's comparable with anything on Earth, that is much cleaner and all from space," says Gary Spirnak, Solaren's chief executive.
Spirnak points to a 2007 study by the National Security Space Office as evidence that a such a space-based power system is feasible:
"There is enormous potential for energy security, economic development, improved environmental stewardship, advancement of general space faring and overall national security for those nations who construct and possess a space-based solar power capability."
He acknowledges that raising more than $2 billion during a recession won't be easy, but says having a guaranteed power purchase agreement with PG&E should carry some weight with potential investors.
