Solar, wind and natural gas generation accounted for nearly all of the capacity added to the U.S. grid in 2017, according to the U.S. Energy Information Administration.
The costs of the former are going down, while the latter two got slightly more expensive, the EIA says in a new report. Falling costs for crystalline silicon axis-based tracking panels drove average solar photovoltaic construction to $2,135 per kW in 2017, part of a 37 percent decline in costs since 2013.
