Overview#
The Cat DG200 is a 200 kW natural gas generator set designed for emergency standby, demand response, and prime power applications. Built on a 10.3-liter V8 turbocharged-aftercooled engine with electronic spark ignition, the DG200 is EPA certified for both emergency and non-emergency stationary applications -- making it suitable for demand response programs and peak shaving in addition to backup power.
The DG200 also accepts propane vapor fuel, though at reduced power ratings (144 kW standby / 117 kW prime). This dual-fuel capability provides fuel flexibility for sites without natural gas service.
Power ratings#
The DG200 offers three operating modes on natural gas at 60 Hz:
- Emergency Standby: 200 ekW -- up to 200 hours/year, average load 70%
- Demand Response: 200 ekW -- up to 500 hours/year, average load 70%
- Prime Power: 157 ekW -- unlimited hours, average load 70%
Engine and alternator#
The 10.3L V8 uses electronic fuel regulation with spark ignition and an electronic governor rated for G2 Class transient performance per ISO 8528-5. The compression ratio of 9.6:1 is conservative for a gas engine, providing detonation margin on variable gas quality.
The M2736L4 alternator frame is available in five voltage configurations (208/120V through 600/346V), all with 105C temperature rise. PMG excitation is standard on low-voltage variants; the 600V configuration uses AREP excitation.
Physical specifications#
At 117.5 inches long, 63 inches wide, and 72 inches high, the DG200 fits in most standard mechanical rooms designed for 200 kW class generators. Dry weight of 3924 lb (1780 kg) allows standard concrete pad installations without special structural reinforcement.
Our service experience#
The DG200 is a straightforward gas generator to maintain. The electronic spark ignition system is the primary service item -- spark plugs require regular inspection and replacement. Natural gas fuel quality is critical: ensure gas supply meets minimum pressure requirements at the rail connector and maintain clean fuel filters. The EPA non-emergency certification opens this unit to demand response revenue opportunities that diesel generators cannot access.
