Texas regulators approved a new wind transmission project which will add a network of transmission lines from west texas to the big cities like Dallas, Houston, Austin and San Antonio. These lines will handle 18,500 megawatts of power, enough for 3.7 million homes on a hot day when air conditioners are running. It will add to the 5300 megawatts of already installed capacity. The project will cost $4.93 billion and will come on stream by 2013. Texas now leads the nation in wind energy with twice the capacity of the next leading state California. Texas is unique because it has its own transmission grid so it can move faster without needing approval of the Federal Energy Regulatory Commission. Transmission is a big problem because in west Texas some of the wind generators have to be turned off because of lack of transmission capacity.