JFP 250kW / 312.5kVA Cummins Natural Gas Generator Set Open Type With Stamford Alternator Product Overview JFP 250kW / 312.5kVA Cummins Natural Gas Generator Set Open Type With Stamford Alternator This 250kW (312.5kVA) open-type Cummins gas generator set adopts Cummins electronically controlled spark ignition gas engine matched with genuine STAMFORD brushless alternator, manufactured in accordance with ISO 8528 standards. The unit can utilize natural gas, biogas, landfill gas