Wärtsilä 50SG

The Wärtsilä 50SG is a four-stroke, spark-ignited gas engine generating set. High efficiency in a small footprint combined with great reliability and flexibility makes this solution ideal for flexible baseload and balancing applications. 

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Wärtsilä 50SG offers unique fast-starting capability, which enables rapid response to fluctuations inherent to renewable generation. The solution also supports you towards decarbonisation with its low greenhouse gas emissions and capability of hydrogen blending. Wärtsilä engine power plants can be delivered both as EPC and Equipment Delivery contracts.

Key benefits

  • High power density for balancing and peaking applications
  • No start cost, limitations nor degradation in number of starts
  • Fast-starting capability which enables rapid response to fluctuations typical to renewable generation
  • Capable of operating in high altitude
  • Runs on natural gas, biogas, synthetic methanol and is capable of hydrogen blending
  • Minimal water consumption
  • Low greenhouse gas emissions

Customer stories

Our proudest numbers


to full load


Electrical efficiency

4 000+

MW installed capacity

The details

Technical details

Engine generating set
Cylinder configurations18V
Cylinder bore500 mm
Piston stroke580 mm
Engine speed500 rpm (50 Hz), 514 rpm (60 Hz)
Rated electrical power (kW)18 434 (50Hz) 18 875 (60Hz)
Electrical efficiency (%)50.2 (50Hz) 50.0 (60Hz)
Heat rate (kJ/kWh)7 165 (50Hz) 7 207 (60Hz)
Loading and unloading
 Connected to gridFull load
Regular start time (min:sec)00:30< 5
Fast start time (min:sec)00:30< 2 
Stop time (min)1
Ramp rate (hot, load/min)> 100%
Minimun Load
Unit level10%
Plant level1%

Product leaflet

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Build your own power plant







> 500MW

Liquid fuels

Natural gas

Liquid fuels and gas

Flexible baseload (>6000 running hours annually)

Intermediate load (2000 - 6000 running hours annually)

Peaking and grid stability (<2000 running hours annually)


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