Officials estimate that the Tehachapi Renewal Project will eventually provide 4,500 megawatts of electricity. The project will harness the wind that blows through the Tehachapi Mountains about 100 miles north of Los Angeles.
Michael Peevey, president of the California Public Utilities Commission, said the project will create the single largest power block of wind energy in the country.
"Our action today represents a critical step in alleviating the transmission constraints that have limited our ability to access substantial wind resources in the Tehachapi region," he said in a statement.
Currently the countrys largest wind farm is the Horse Hollow Wind Project in Texas that provides 730 megawatts, according to Edison spokesman Steve Conroy.
Construction was expected to begin on March 11. The first few phases include building two new substations near Mojave and Monolith and several new transmission lines that are expected to be operational by 2009.
The project is part of Edisons five-year, $5 billion transmission expansion program. Edison provides power to 180 cities in central, coastal and southern California outside Los Angeles.
In January, the city of Los Angeles broke ground on the 8,000-acre Pine Tree Wind Project in the same area. That project is expected to produce enough electricity to power 56,000 homes when it is complete in 2009.
Wind energy currently makes up just over 1 percent of all the power used in the U.S. but is the nations fastest growing energy source, according to the American Wind Energy Association.