Energy policy of the United States
U.S. wind power installed capacity now exceeds 65,000MW. For calendar year 2014, the electricity produced from wind power in the United States amounted to 181.79 terawatt-hours, or 4.44% of all generated electrical energy. Texas is firmly established as the leader in wind power development, followed by Iowa and California.
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.