This document provides specifications for a diesel generator set model SC1250 powered by a Cummins engine. It has a standby power rating of 1250 kVA at 1000 kW. The generator set consists of a 4-cycle, 60 degree Vee, 12 cylinder Cummins KTA38-G9 diesel engine coupled to a Leroy Somer LSA50.2M6 or Stamford HCI634K alternator for prime and standby power applications up to 500 annual hours. Detailed specifications are provided for the engine, alternator, control panel, and standard and optional features.