Three orange engines sit in a building on the sprawling grounds of the Back River wastewater treatment plant, producing a steady din. And about 20 percent of the electricity the facility needs. "It's basically a mini power plant," said Ted Atwood, director of the Baltimore City Energy Office. This is "microgeneration"— operations that look nothing like the sprawling complexes that most of the country relies on for light, heat and air conditioning. Making electricity on site isn't new, but advocates say interest is growing among significant energy users, driven by cheaper prices for natural gas to fuel systems...
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