Southern California Edison announced Friday that it had started construction on the largest wind power transmission project in the use. The Tehachapi Renewable Transmission Project includes a series of new and upgraded high-voltage transmission lines capable of delivering 4,500 megawatts of electricity from wind power farms in Northern Los Angeles and Eastern Kern counties. It includes about 85 miles worth of high voltage transmission lines, which are expected to be operational in 2009. The transmission lines are needed in order to deliver the power from wind power farms being developed in the Tehachapi Wind Resource Area. The project will also improve overall grid reliability. When fully completed in 2013, the project will be capable of carrying 4,500 megawatts of electricity, or enough juice to power nearly 3 million homes.