CHARLOTTE, N.C. -- Harris Teeter here is investigating new ways to save on electricity, including a test this summer of a natural gas-driven air conditioning system in one of its stores here. This relatively new type of technology can run on either electricity or natural gas, to take advantage of electric rate variations at different times of day. The retailer is also using antisweat controls on reach-in frozen food cases in 15 of its stores. One store's return on investment for the ...

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