Walmart had held the top spot for the previous four years and still claims second place with 145MW of solar power installed on 364 buildings, according to the SEIA, which has been tracking corporate solar deployments for the past five years.

"We're incredibly proud of the progress we've made in improving building efficiencies and reducing environmental impact. Our commitment to installing solar panels on 500 stores and distribution centers by 2020 is evidence of that progress," said John Leisen, vice president of property management at Target.

This year, real estate developer Prologis came in third with 107.8MW of solar. Apple, which is in fourth place with 93.9MW of installed solar power, may be a contender for first place sometime next year.

Last year, Apple announced it was investing $850m in a solar power plant through a partnership with First Solar, one of the nation's largest photovoltaic (PV) manufacturers and provider of utility-scale PV plants.

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