Texas has again become the national leader in an emerging area of energy production. As it did with oil in the 1940s, Texas in 2006 surpassed California and became the nation’s leading producer of wind power, with an installed generating capacity of 2,736 megawatts (MW). State wind power production increased nearly fivefold in the eight years since. In the first quarter of 2014, Texas had an installed wind power capacity of 12,354 MW, more than twice as much as any other state and over one-fifth of the total U.S. installed capacity.