Sustainable Energy

Here are the top 10 US corporates going big on solar power

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Now in its fifth year, the "Solar Means Business" report by the Solar Energy Industries Association (SEIA) assesses the biggest corporate adopters of solar power in the U.S.

Here, CNBC takes a look at the report's top 10 companies in terms of installed solar capacity, and assesses their other green credentials.

10. Hartz Mountain – 23 MW (megawatts)

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The SEIA says that commercial real estate owner Hartz Mountain is New Jersey's "largest commercial rooftop solar owner."

9. General Growth Properties – 30 MW

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Chicago-based General Growth Properties' 2016 Sustainability Report states that the business managed to reduce its carbon footprint by 23,200 metric tons of CO2, cut water consumption at its properties by 64 million gallons, and slashed electricity consumption by around 215 million kilowatt hours.

8. Macy's – 39 MW

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With 39 MW (megawatts) of installed solar capacity, Macy's comes seventh in the SEIA's list.

Macy's says it has set itself a number of sustainability goals. These include installing extra solar power systems at its facilities, reducing energy usage, and increasing waste "diverted from landfills" to 70 percent by 2018.

7. IKEA – 44 MW

According to the SEIA's report, more than 90 percent of IKEA's American stores get their power from the sun.

The Swedish business says that by the year 2020, it will produce as much renewable energy as it consumes.

6. Kohl's – 50 MW

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The SEIA says that almost 19,000 Americans work in a Kohl's department store powered by solar.

For its part, Kohl's says on its website that, as of 2015, it had achieved "100 percent carbon neutrality" for six successive years, while it has over 160 solar arrays on its buildings.

5. Costco – 51 MW

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With 51 MW of installed solar capacity, Costco is placed fifth in the SEIA's list.

In its Sustainability Report for 2015, the retailer said it was looking to, among other things: Enhance energy management systems in its warehouses; develop its recycling and waste stream management systems; and maintain its carbon footprint growth "to less than our company sales growth."

4. Apple – 94 MW

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The SEIA's report states that the amount of electricity generated by Apple's solar facilities is enough to "fully charge more than 39 million iPhones every day for a year."

The tech giant has placed a huge emphasis on clean energy. On its website, Apple states its "operations" in the U.S., China and 21 other countries are powered by 100 percent renewable energy.

3. Prologis – 108 MW

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Industrial real estate business Prologis has, according to the SEIA, installed more solar capacity than 27 U.S. states.

In its 2015 Sustainability Snapshot, the San Francisco-based business said that its solar footprint across nine countries amounted to 149 MW of generating capacity.

The company added that around 31 percent of its operating portfolio had reflective roofing, which had helped to cut roof surface temperatures by up to 50-degrees Fahrenheit.

2. Walmart – 145 MW

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Second place in the SEIA's list is Wal-Mart, with 145 MW of installed solar capacity. The SEIA says that every week, 7.3 million people visit a solar-powered Walmart store.

The retail giant says it has set itself the target of being supplied by 100 percent renewable energy, and says that 81 percent of materials that go through its distribution centers, stores and clubs is being diverted from landfill.

1. Target – 147 MW

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Target's 147.5 megawatts of installed capacity pushes it to the top of the SEIA's rankings – and above businesses such as Wal-Mart and Apple – for the first time.

Sustainability is a key part of Target's business. It says it designs and builds its stores with water-saving features and has set itself the goal of reaching 500 buildings with solar panels on their roofs by 2020.