Intorducing four models of Tier 4 Interim (Tier 4i) mobile generators: The G150, G190, G240, and G325 mobile generators range from 25 to 570 kVA. These models have power ratings greater than 174 hp and have been designed for the implementation of Tier 4 final (Tier 4f) technologies effective in 2014. Doosan Portable Power. 800-743-4340.