Last year's low figure was as a result of uncertainty in the sector due to the delayed extension of the production tax credit (PTC).
Texas saw the greatest increase in capacity, with 400MW installed followed by Nebraska (201MW) and Michigan (136MW).
The southern US state was helped by the 218.3MW Panhandle 1 project being commissioned in the second quarter.
According to AWEA, the US now has an installed capacity of 61.9GW from 46,300 turbines.
Texas is set to continue leading the way with capacity, as over 8GW in projects are currently under construction in the state. In total, the US has 14.6GW of wind under construction across 106 projects in 21 states.