One Parkway The installation of a pair of 400-ton Tecogen natural gas engine-driven chillers in a City-owned office building is providing Philadelphia taxpayers some welcome savings. "We've had a dramatic drop in energy costs," says Kent Miller, Executive Director of the City of Philadelphia's Energy Office, which planned the new cooling system at One Parkway. The building's old cooling system cost $238,000 a year to operate, he explains. "No

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