With all of the sunshine that we get here in Southern California, we should have solar panels everywhere soaking up all of the free (and clean!) energy. Fortunately for us, SoCal Edison leads the nation in the purchase of renewable energy, a pursuit that helps to spur development projects to provide it.

Just this week, the utility announced that it had signed a new contract for an additional 245 megawatts of solar power with Pasadena-based eSolar. But this isn’t just another massive installation of photovoltaic panels - it’s the nation’s first commercial project to use “power tower solar thermal technology.”

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With SoCal Edison the hits just keep coming, as the utility has signed a new contract to receive up to 909 megawatts of wind power from DCE, an affiliate of Caithness Energy.

To be built between 2011 and 2012, the Caithness Shepherd’s Flat project in North-Central Oregon will involved 303 wind turbines across 30 square miles. This will make it one of the world’s largest fully permitted wind farms, but it won’t require any additional or upgraded transmission lines, speeding the time frame for operation.

The project is expected to generate 2 billion kilowatt-hours per year of renewable energy - more than 10% of SCE’s total renewable energy portfolio.

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Residential applications for solar panels have been making news for several years. But as rising fuel prices spur consumers to look for alternate energy sources, another clean power source is beginning to get attention: wind energy.

Even though the residential wind power sector has seen tremendous growth over the last decade, an article in The Arizona Republic estimates that there are still only 4,000 residential wind turbines nationwide. The primary reason that wind energy has been slow to take hold is that wind turbines are fairly visible, and therefore highly controversial, installations. According to the American Wind Energy Association, small wind systems (100 kilowatts or less) need to be at least 30 feet above barriers which might break the force of the air currents reaching the turbine. Right now, the industry recommends wind turbines only for sites that are at least one 1 acre in size. Consequently, wind turbines in urban areas are still quite rare. (In a September 2007 post, earth2tech featured a San Francisco home which sports a turbine, and pointed out that this may be the first urban wind turbine in the country.)

Unfortunately, individual efforts to experiment with wind power, even in outlying areas, have encountered a lot of roadblocks. Proposed turbine installations are usually evaluated by local governments on a case by case basis, since most city zoning laws have height restrictions which would implicitly prohibit turbines. Oftentimes, even if permission is granted and a turbine is erected, neighbors unite to fight the decision. (For individual turbine projects that have made news for seeking exceptions to local codes, see these articles on Wayne, New Jersey and Atlanta, Georgia). (more…)

Utility-scale windpower is an important and growing part of the US energy portfolio. Farms ranging in size from dozens to hundreds of turbines can produce in excess of 60 megawatts of power. Plans for gigawatts of wind power are being proposed all over the globe, and new wind farms are regularly being proposed that outstrip one another to be the largest in their respective locations, or in the world. At the far end of the scale, the largest size wind turbines have a rotor diameter of 126 meters (413 feet), and are estimated to be capable of producing 20,000,000 kilowatt hours of electricity annually (enough to power as many as 5000 European homes). Since the power generated by a turbine increases exponentially as it gets larger, new turbines will continue to grow in size.

But small-scale turbines are perhaps a more exciting realm of development. The standard, propeller-style turbine is well established, and there are many suppliers for this kind of generator in a range of sizes. In 2007, Home Power Magazine had a roundup of more than a dozen small wind turbines ranging from 8 feet to 56 feet in diameter (the latter of which is far larger than even a large, inefficient household would need for their power requirements). Green Building Elements had a review of this article last year.
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