PG&E to get watts from waves

The San Francisco-based company, which this year proposed a test facility for producing power from ocean waves, said the electricity in its new contract would come from a wave project planned by Canada's Finavera Renewables Inc. for the waters off the coast of Northern California's Humboldt County.

The PG&E Corp. subsidiary said power from the 15-year deal would be delivered beginning in 2010 and would provide a relatively meager boost to the grid: just 2 megawatts, or enough to power about 1,500 homes. But the company said the power deal was a significant milestone for a promising technology that could be a major source of renewable energy for the state.

"Given the potential for wave power off the coast of California, it's definitely something that's exciting for us," said Uday Mathur of PG&E's energy procurement department. "This shows the marketplace that there is a demand for it."

Finavera, based in Vancouver, is one of many companies chasing technologies designed to harness the force of the ocean to produce power. Some hope to tap the sea's below-surface tidal forces, some target the power of breaking waves, and Finavera and others have focused on surface waves offshore.

"It's very, very much an emerging technology," said Roger Bedard, ocean energy leader at the Electric Power Research Institute and coauthor of a 2006 study of wave power's potential in California. He applauded PG&E's move, noting that wave power could capture more energy in less space than wind and solar power systems.

"There are a whole bunch of different ways to harness wave power," Bedard said. "This is, in fact, the first step. . . . It's way too early to know which ones will turn out to be the most commercially economical."

Finavera's "wave park" would include eight bobbing buoys set up about 2 1/2 miles offshore from Eureka, Calif. The up-and-down motion of the Pacific Ocean would power a pump that creates electricity, which would be delivered to a PG&E substation via an underwater transmission cable.

PG&E and Finavera wouldn't disclose the cost of the project or the power, but both acknowledged that the electricity would be pricier than more established alternatives. The power contract must win approval from the California Public Utilities Commission; the wave project must pass muster with a host of federal and state agencies.