The New York Times

The aisles of a typical Walgreens drugstore are stacked with products promoting their green attributes, whether they are towels made from recycled paper or makeup brushes made from fast-growing grass.  But increasingly, on the roof, a less visible green endeavor is under way, in the form of solar panels feeding power to the store. 

Walgreens, which has installed 134 solar systems across the country and has plans for many more, says its solar program stems from the brand’s connection to healthful living and a bottom-line desire to stabilize energy costs.

But it has plenty of company from other big-box retailers. Large chain stores, more than any other type of business, rely on rooftop solar power to help meet their energy needs, according to a report to be released Wednesday by the Solar Energy Industries Association and the Vote Solar Initiative, an advocacy group.