Green Wombat

California utility to turn roofs into solar power plants

Southern California Edison plans to install 250 megawatts’ worth of solar panels on commercial rooftops, generating enough electricity to power 162,000 homes.

It’s a potentially game-changing move, one that could lower the cost of solar cells as manufacturers ramp up production to meet the utility’s schedule of installing a megawatt-a-week of arrays until it reaches the 250-megawatt target. That alone is more than United States’ entire production of solar cells in 2006 and will produce as much electricity as a small coal-fired power plant, albeit with no greenhouse gas emissions. “This project will turn two square miles of unused commercial rooftops into advanced solar generating stations,” said John Bryson, CEO of the utility’s parent company, Edison International (EIX), in a statement Wednesday night.

The $875 million initiative also marks the first big move into so-called distributed energy by a major utility. Instead of building a centralized power station and the expensive transmission system needed to transmit electricity to the power grid, Edison will connect clusters of solar arrays into existing neighborhood circuits. A significant hurdle for the massive megawatt solar power plants planned for California’s Mojave Desert is the need in some cases to build multi billion-dollar transmission systems through environmentally sensitive lands to bring the electricity to coastal metropolises.

Solar arrays of course only generate electricity when the sun is shining, but they produce the most power during the hottest part of the day when Southern Californians crank up their air conditioners. The arrays could help spare Edison from having to fire up a fossil-fuel power plant when demand peaks.

Edison spokesman Gil Alexander told Green Wombat that the utility expects the project’s scale to allow arrays to be placed on roofs at half the cost of a typical installation. Edison’s ambitions could prove a boon for solar cell makers like SunPower (SPWR) and Suntech (STP) as well as solar installation companies such as Akeena (AKNS). One unknown is whether the demand created by Edison will drive up costs in the short term, given ongoing shortages of polysilicon, the base material of solar cells. The Edison project could also help jump-start the market for thin-film solar panels, which typically use far less silicon than conventional solar cells.

Alexander says Edison is already negotiating with solar panel makers and installers. Needless to say, the project will be a boon for green collar workers.

Here’s how the solar roofs initiative will work: Edison will lease warehouse rooftop space from building owners. (The target area is the fast-growing “Inland Empire” of Riverside and San Bernardino counties.) The utility will contract for the installation of the arrays and will retain ownership of the solar systems. California regulators appear inclined to approve the project, which will be financed by a hike in utility rates.

“This will be a utility-scale solar power plant, if one thinks of the 100 or so buildings on which the two square miles of solar panels will be installed,” Alexander wrote in an e-mail. “One advantage of this project is that we will tap unused rooftop real estate directly in areas we serve where demand is growing rather than securing a major plat of land in a remote area and then building transmission lines to bring the power to those areas of rising demand.”

Anyone who has driven through Los Angeles can attest to the endless acres of big-box stores, warehouses and strip malls and the potential to generate green power from sun-baked suburban sprawl.

Edison’s solar roof ramp up is likely to put pressure on California’s other big utilities, PG&E (PCG) and San Diego Gas & Electric (SRE), to follow suit. Like Edison, they face a state mandate to obtain 20 percent of their electricity from renewable sources by 2010 and 33 percent by 2020. California’s global warming law requires the state’s greenhouse gas emissions to be rolled back to 1990 levels by 2020.

The Governator himself gave a not-so-subtle nudge to Edison’s competitors. “These are the kinds of big ideas we need to meet California’s long-term energy and climate change goals,” said Gov. Arnold Schwarzenegger in a statement. “I urge others to follow in their footsteps. If commercial buildings statewide partnered with utilities to put this solar technology on their rooftops, it would set off a huge wave of renewable energy growth.”

Florida utility jumps into California solar market

Utility giant FPL has filed plans with California regulators to build a $1 billion, 250-megawatt solar power plant in the Mojave Desert. The move marks the first time that a major player — in this case a Fortune 500 company — has jumped into the nascent Big Solar market.

Juno Beach, Fla.-based FPL’s renewable energy arm, FPL (FPL) Energy, will operate the Beacon Solar Energy Project, which will connect to the transmission system operated by Los Angeles’ municipal utility, the Los Angeles Department of Water and Power. FPL Energy spokesman Steve Stengel declined to say whether the company had struck a deal with LADWP to buy the electricity produced by the Beacon project. “We are currently in discussions with a potential customer on a power purchase agreement for this project,” he wrote in an e-mail. “However, due to confidentiality considerations, I cannot elaborate at this time.”

California law requires the state’s investor-owned utilities — PG&E (PCG), Southern California Edison (EIX) and San Diego Gas & Electric (SRE) — to obtain 20 percent of their electricity from renewable sources by 2010 and 33 percent by 2020. But public utilities like LADWP only have to set green energy targets, 13 percent by 2010 and 20 percent by 2017 in Los Angeles’ case. Under California’s global warming law, the state’s greenhouse gas emissions must be reduced to 1990 levels by 2020.

Those renewable energy mandates have been driving the market for large-scale solar power plants, but so far California’s Big Three utilities have placed their bets on startups like Ausra, BrightSource Energy and Stirling Energy Systems.

FPL Energy, however, is no stranger to the California solar market. It currently operates seven of nine “solar trough” power plants that were built by Israeli solar pioneer Luz International in the 1980s and early ’90s in the Mojave at Kramer Junction and Harper Dry Lake.

The plants use long rows of parabolic mirrors to focus the sun’s rays on tubes of synthetic oil suspended above the arrays. The hot oil is used to create steam which drives electricity-generating turbines. The company’s new power plant (artist rendering above) will built on 2,012 acres of former farmland near California City and will also use solar trough technology.

FPL tends to be tight-lipped about its plans but in a recent interview with Green Wombat, FPL Energy senior vice president Michael O’Sullivan acknowledged the company is bidding on contracts with utilities throughout the Southwest. “We do not develop through the issuance of press releases,” he says, “and there’s a lot of thinly capitalized solar developers trying to get attention by running around the Southwest announcing projects.” Unlike competitors developing new solar technology, FPL is sticking with the tried and true. “One reason we’re focused on solar trough technology like we have out at Kramer is that it’s a proven, financeable technology,” O’Sullivan says.

In a letter accompanying the Beacon Solar application to the California Energy Commission, O’Sullivan estimated the project would create 1,000 jobs during the two-year construction phase and 66 permanent positions once it goes online in 2011.