Wind power in the United States
The U.S. Department of Energy’s 2008 report "20% Wind Energy by 2030" envisioned that wind power could supply 20% of all U.S. electric power, which included a contribution of 4% to the nation’s total electric power from offshore wind power. In order to achieve this, however, significant advances in cost, performance and reliability are needed, based on a 2011 report from a coalition of researchers from universities, industry, and government, supported by the Atkinson Center for a Sustainable Future. Obtaining 20% from wind requires about 305 GW of wind turbines, an increase of 16 GW/year after 2018, or an average increase of 14.6%/year, and transmission line improvements. Analysts estimate around 25 GW of added US wind power in 2016-18, depending on the Clean Power Plan and PTC extensions. After the current PTC phase-out in 2021, additional wind power capacity is expected to be around 5 GW per year.
In 2015, electric power generation from wind power was 10 percent or more in twelve U.S. states: Colorado, Idaho, Iowa, Kansas, Maine, Minnesota, North Dakota, Oklahoma, Oregon, and South Dakota, Vermont, and Texas.
Iowa, South Dakota, and Kansas each had more than 20 percent of their electric power generation come from wind. Twenty states now have more than five percent of their generation coming from wind.
Energy market
Currently, the majority of the United States’ renewable energy production comes from hydroelectric power, solar power, and wind power. According to the U.S. Department of Energy, the cost of wind power doubled between the years of 2002 to 2008. However, since then, the prices of wind power have declined by 1/3, on average. Various factors have been contributing to the decline in the cost of wind power, such as government subsidies, tax breaks, technological advancement, and the cost of oil and natural gas. 
Hydroelectric power has been the most predominant source of renewable energy for quite some time due to the fact that it has been proven to be reliable and has been in use for quite some time. This source of energy has provided the majority of renewable energy and has been a significant source of overall energy production in the United States. The problem with traditional hydroelectric power has been the requirement of damming rivers and other sources of water. The problem created by damming is that the natural environment of the area is disrupted due to the formation of a lake caused by the damming of the water source. This creates uproar by environmentalists and a large obstacle to clear before being able to build a hydroelectric plant. However, new forms of hydroelectric power that harness wave energy from the oceans have been in development in recent years. Although these power sources still need much development before they become economically viable, they do have potential to become significant sources of energy.