New York Times: To the casual eye, the basement of this city’s Firehouse 9 looks like a jumble of old hydrants, Dr Pepper cartons, rakes and random gear. To specialists in energy efficiency, the 1960s-era building is a mess of a different sort: wasteful hot water heaters for the firefighters’ showers, ancient refrigerators and outdated lights. Wrapping up an elaborate energy audit, Knoxville is about to find out which of 99 city buildings are wasting the most energy. It hopes to begin repairs this …