GREEN ENERGY SYSTEMS MAY HAVE A LOT OF cachet these days, but when are they financially viable for retailers?

There are numerous elements that go into answering that question, said Willis McCullough, national program director, Energy Efficiency Services, an engineering firm in Hopkinton, N.H., who spoke last month at the Food Marketing Institute's Energy & Store Development Conference in Atlanta.

On-site, combined heat-and-power (CHP) systems — such as f

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