Wal-Mart will double its use of solar energy by putting rooftop solar arrays on 10-20 stores or distribution centers in California.

Wal-Mart plans to announce for Earth Day on Wednesday that it will as much as double the size of its solar-power initiative in the next 18 months by putting rooftop solar arrays on 10 to 20 stores and distribution centers in California. The retail giant early this month finished installing solar setups at 18 Wal-Mart and Sam’s Club stores and two warehouses in California and Hawaii.

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