This interactive map illustrates the coming of cost-competitive solar based on a comparison of the unsubsidized cost of solar electricity with retail electricity prices of all 3100 utilities in the United States. The numbers on a state indicate the number of megawatts of solar power that could produce electricity at or below the utility's retail electricity price (without subsidies) for residential and/or commercial customers. The shaded colors indicate what percentage of the residential and/or commercial electricity sales could be met with the cost-effective solar.

With the controls below, you can explore the growth of competitive solar for residential and/or commercial customers; by year, from 2012 through 2022; see the impact of federal tax incentives (without them, with the current 30% federal tax, or with a 10% tax credit as will happen without statutory change in 2017); and adjust the maximum amount of solar allowed on a utility's system (as a percentage of retail sales).

Data for the map are derived from the Commercial Rooftop Revolution report released by the Institute for Local Self-Reliance in December 2012 (see the Appendix for assumptions). This map is just one of our Rooftop Revolution resources on the role of solar in the democratization of energy.

Potential installed capacity (megawatts) & percent of Residential electricity sales from solar at parity.



Utility Cap
  • 2012
    $4/W
  • 2013
    $3.72/W
  • 2014
    $3.46/W
  • 2015
    $3.22/W
  • 2016
    $2.99/W
  • 2017
    $2.78/W
  • 2018
    $2.59/W
  • 2019
    $2.41/W
  • 2020
    $2.24/W
  • 2021
    $2.08/W
  • 2022
    $1.94/W