This is the format used by most areas. It has a four-digit area code (after the initial zero) and a six digit subscriber number, and is known as 4+6 format. These area codes were changed by adding a 1 directly after the initial zero as a part of PhONEday in 1995. Just short of 581 areas use this format, and the area codes range from 01200 to 01998.
For calendar year 2016, wind power in the United States amounted to 226.5 terawatt-hours, or 5.55% of all generated electrical energy. As of January 2017, the U.S. nameplate generating capacity for wind power was 82,183 megawatts (MW). This capacity is exceeded only by China and the European Union. Thus far, wind power's largest growth in capacity was in 2012, when 11,895 MW of wind power was installed, representing 26.5% of new power capacity.
Washington, D.C.- American wind power topped 4 percent of the U.S. power grid for the first time last year and has delivered 30 percent of all new generating capacity for the last five years. In Iowa and South Dakota, wind power now exceeds 25 percent of total electricity production.RCOT, the main electric grid in Texas, received 9.9 percent of its electrical generation from wind energy during 2013 and is on track to top 10 percent in the coming years considering the 7,000 MW of new capacity now under construction in Texas.