Target is a major installer of rooftop solar capacity. Source: Target

Companies like Target, Kohl's and Costo are investing in solar in record amounts, according to a report from the Solar Energy Industries Association, which tracks on-site commercial solar installations and ranks top corporate solar users.

The report contains data from more than 4,000 companies, totaling more than 2.5 gigawatts of solar capacity across approximately 7,400 solar projects.

By adding more than 40 megawatts (MW) of solar in 2017, Target earned the top spot in the report for the second year in a row. The big-box retailer now has 204 MW of installed solar capacity. The retailer has a goal to install rooftop solar panels on 500 buildings by 2020.

In addition to Target, the top 10 corporate users of solar energy are Walmart with 149 MW of installed capacity, Prologis with 121 MW, Apple with 79 MW, Kohl’s with 51 MW, Costco with 51 MW, General Growth Properties with 50 MW, IKEA with 45 MW, Macy’s with 35 MW and Amazon with 34 MW.

The top corporate users named in the report added 325 MW of installed solar capacity in 2017, an increase of 43 percent over 2015.