The view to the west from Ocean Beach could one day be cluttered with scores of spinning windmills, generating power.
San Francisco under Mayor Gavin Newsom has long explored the possibility of tapping alternative energy sources, including tidal, wave, solar, geothermal and wind power.
The City is reviewing the environmental impacts of a planned project that would place underwater devices off Ocean Beach to harness wave power, which is a nascent form of renewable energy. The review and its approvals are expected to wrap up within a year.
City leaders are starting to think that construction of the wave power project could help them assess the viability of a more visually striking proposal: a wind farm.
Ocean Beach was found by UC Berkeley professor Ronald Yeung to have good potential for a powerful wave energy farm. Waves that roll into the beach are created by Arctic tempests.
The finding was confirmed last year by city contractors, who determined a facility could provide up to 30 megawatts of electricity — enough power for 30,000 homes.
Environmental review work under way involves studying sediment movement and tracking whale migration patterns to determine the best places on the sea floor to attach futuristic wave power devices.
Recent changes in federal regulations could limit San Francisco to working within three miles of the shoreline because offshore renewable energy projects now require expensive leases instead of less-expensive permits, although the process is clouded by uncertainty.
The federal Mineral Management Services agency has responsibility for regulating offshore renewable energy resources, including wave and power farms, but the agency is being overhauled in the wake of the Gulf oil spill disaster.
The recent regulatory changes could see offshore energy rights snapped up by deep-pocketed oil or utility companies under anticipated bidding processes.
On San Francisco’s clearest days, visitors to Ocean Beach can sometimes see the Farallon Islands, which are 27 miles west of San Francisco — nearly 10 times further out to sea than the three-mile offshore border.
After safe and potentially powerful locations have been identified, wave energy technology will be selected from a growing suite of options including devices that float near the surface, those that hover in midwater and undulating seabed equipment inspired by kelp.
The next step would involve applying for permits and installing the equipment.
Somewhere along the way, costs will be determined and funds will need to be raised by officials or set aside by lawmakers.
Once the wave-catching equipment is in place, it could be used to help determine wind velocities and other factors that make the difference between viable and unviable wind farm sites.
“What we really need to do is put some wind anemometers out there,” Newsom’s sustainability adviser Johanna Partin said. “There are a couple of buoys off the coast with wind meters on them, but they are spread out and few and far between. As we move forward with our wave plans, we’re hoping there are ways to tie in some wind testing. If we’re putting stuff out there anyway then maybe we can tack on wind anemometers.”
Partin characterized plans for a wind farm off Ocean Beach as highly speculative but realistic.
Wind power facilities are growing in numbers in California and around the world.
But wind farms are often opposed by communities because of fears about noise, vibrations, ugliness and strobe-light effects that can be caused when blades spin and reflect rays from the sun.
A controversial and heavily opposed 130-turbine project that could produce 468 megawatts of power in Nantucket Sound received federal approvals in May.
West Coast facilities, however, are expected to be more expensive and complicated to construct.
“The challenge for us on the West Coast is that the water is so much deeper than it is on the East Coast,” Partin said.
Treasure Island is planned site for turbine test
A low-lying island in the middle of the windswept Bay will be used as a wind-power testing ground.
The former Navy base Treasure Island is about to be used in an international project to test cutting-edge wind turbines. It was transferred last week to to San Francisco to be developed by private companies in a $100 million-plus deal.
The testing grounds, planned in a southwest pocket of the island, could be visible from the Ferry Building.
The first turbines to be tested are known as “vertical axis” turbines, meaning they lack old-fashioned windmill blades, which can be noisy and deadly for birds.
The devices to be tested were developed by Lawrence Berkeley National Laboratory in cooperation with Russian companies. Five were manufactured in Russia and delivered to California earlier this year.
The wind-technology relationship, which was funded with $2 million in federal funds, grew out of an anti-nuclear-proliferation program started in 1993.
“The vertical machines should be good in gusty low-wind conditions, which are those which you expect in an urban environment,” lead LBNL researcher Glen Dahlbacka said recently.
The machines were designed to minimize noise and are easily built.
“They’re relatively easy to work up in a fiberglass shop,” Dahlbacka said.
Eventually, each device could be coupled with solar panels to provide enough power for a modest home, Dahlbacka said.
The team is not expected to be the only group to test wind turbines on the island.
San Francisco plans to provide space for green-tech and clean-tech companies to test their wind-power devices on the island to help achieve product certification under federal standards adopted in January.
The program could help The City attract environmental technology companies.
“It’s an opportunity to attract and retain clean-tech companies,” Department of the Environment official Danielle Murray said. “We’ve just started putting feelers out to the industry.”
The proposed testing grounds might have to shift around as the island is developed with thousands of homes and other buildings in the coming years.
“We need to work with them with regards to where these things go and how they would interact with the development project,” Wilson Meany Sullivan developer Kheay Loke said.
— John Upton
Renewable energy projects
- City subsidies have helped property owners install panels on their roofs
- City-backed solar power plant could be switched on this year at the Sunset Reservoir
- Future city solar power projects are on hold pending resolution of a labor dispute
- Mayor Gavin Newsom directed city departments to install wind devices when possible
- Permitting of proposed residential wind turbines was simplified in recent years
- Few residential wind turbines exist, but one is planned in a Miraloma Park neighborhood front yard
- San Francisco is investigating the possibility of installing an underwater wave power farm off Ocean Beach
- Grants are being sought to investigate watershed lands’ potential to generate geothermal power, which comes from underground heat
- San Francisco supports a PG&E plan to install a turbine to catch the power of sweeping tides beneath the Golden Gate Bridge
— John Upton