The G40WDO mobile generator, rated with prime power output of 39 kVA, fills the position between the company’s G25 and G50 generator models. Equipped with a Tier 4-F Doosan D24 diesel engine rated at 49 horsepower and requiring no diesel particulate filter, the G40 is exempt from permitting fees or surcharges assessed in some states on diesel-powered equipment of 50 or more horsepower.