Generator Replacement: Old vs. New Efficiency, Emissions and Payback

A side-by-side of an old gas engine generator (10,500 Btu/kWh, 32.5% efficient) and a high-efficiency lean-burn unit (8,050 Btu/kWh, 42.4%), with emissions and O&M comparisons, $740,000 a year in savings and a payback of 0.88 years.