According to data collected by the U.S. Energy Information Administration (EIA), project developers expect more than 23 GW of wind turbine generating capacity to come online in the United States in 2020, far more than the previous record of 13.2 GW added in 2012. Only 5.0 GW of capacity has come online in the first eight months of this year, according to EIA’s Preliminary Monthly Electric Generator Inventory, but as is typical with wind turbine installations, most of the annual capacity additions come online in the final months of the year. Another 18.5 GW plan to come online in September through December, according to project timelines reported to EIA by power plant owners and developers.
The 5.0 GW of capacity added in the first eight months of 2020 is already more than the capacity added in the first months of any year except 2009. Developers expect to add another 18.5 GW in the final four months of 2020: 8.9 GW in September to November and 9.6 GW in December. December is typically the month with the most wind turbine capacity additions. In the previous 10 years, 41% of the annual wind capacity additions came online in December.
The impending phaseout of the full value of the US production tax credit (PTC) at the end of 2020 is leading to more capacity additions than average this year, just as previous tax credit reductions led to significant wind capacity additions in 2012 and 2019. Wind turbine projects coming online through 2023 that began construction in 2019 qualify for lower values of the PTC.
EIA’s November 2020 Short-Term Energy Outlook shows wind’s share of US electricity generation increasing from 7.4% in 2019 to 8.8% in 2020 – more than any other renewable electricity generation source. EIA forecasts wind’s share to reach 10.3% in 2021. Because most of the wind capacity comes online late in the year, each year’s annual capacity additions tend to increase wind electricity generation in the following year.