United States wind energy policy
There are currently 5,600 MW of projects under construction in 2011. The U.S. Department of Energy's 2011 report "20% Wind Energy by 2030" envisioned that wind power could supply 20% of all U.S. electricity, which included a contribution of 4% from offshore wind power.
Low-carbon power
At the end of 2011, worldwide nameplate capacity of wind-powered generators was 238 gigawatts (GW), growing by 40.5 GW of nameplate capacity over the preceding year. Between 2005 and 2010 the average annual growth in new installations was 27.6 percent. According to the World Wind Energy Association, an industry organization, in 2010 wind power generated 430 TWh or about 2.5% of worldwide electricity usage, up from 1.5% in 2008 and 0.1% in 1997. Wind power's share of worldwide electricity usage at the end of 2014 was 3.1%. Several countries have already achieved relatively high levels of penetration, such as 28% of stationary (grid) electricity production in Denmark (2011), 19% in Portugal (2011), 16% in Spain (2011), 14% in Ireland (2010 to 2014) and 8% in Germany (2011). As of 2011, 83 countries around the world were using wind power on a commercial basis.