Big-box retail chains are treating their roofs as valuable real estate, installing solar panels capable of generating up to 40% of a store's power needs. Kohl's, Macy's and Safeway are among the chains jumping on the trend, though analysts say a congressional extension of clean-energy tax credits will be needed to maintain momentum. Wal-Mart, which has 17 stores and distribution centers testing solar panels, says a total build-out across the chain would create solar acreage roughly the size of Manhattan.

Full Story:

Related Summaries