Wal-Mart led the country on solar implementation for the second consecutive year, with solar installations generating 89 megawatts at 215 locations, according to the annual Solar Means Business Report. Several other retailers made the list's top 25, including Costco, Kohl's, Apple, IKEA, Macy's, Bed Bath & Beyond, Walgreens, Target, Safeway and Toys R Us.

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