Producing oil and gas is a complex task that requires equipped designed specifically for the oilfield. Cat C-Series oilfield diesel generator sets offer a rugged design capable of withstanding harsh conditions in the oilfield. Decades of experience in engine manufacturing combined with the latest electronics deliver the highest performance, safe operation, low emissions, and simplified operator interface. Cat generator sets are backed by the worldwide network of Cat dealers ready to support your operation with technical support, service, parts, and warranty. C18 ACERT oilfield diesel generator set. Ratings: 440 – 545 ekW (550 – 680 kVA) @ 50 and 60 Hz (1500 and 1800 rpm) meet U.S. EPA Tier 2 equivalent, EU Stage II equivalent emission standards.