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.
An $18,000 system ($12,600 after the tax credit) that produces 3800 kWh a year in a windy place with 12mph avg. windspeed will produce 76,000 kWh over its 20-year life, for a cost of $0.17 per kWh. That's much more than grid energy, and way more than solar. Wind power resources: Here's a quieter wind turbine, since many models are fairly loud. Average wind speed by city, and a wind map of the U.S. You need avg. windspeed of about 12mph (5.5 meters per second) to make wind power approach cost-effective.