Wärtsilä 50SG gas engine

The Wärtsilä 50SG gas engine 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 gas engine 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 of the Wärtsilä 50SG gas engine

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  • 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
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  • Runs on natural gas, biogas, synthetic methane and is capable of hydrogen blending
  • Minimal water consumption
  • Low greenhouse gas emissions
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Customer stories

  • Portland General Electric, Portland, USA

    Wärtsilä’s 50SG engines provide peaking power without efficiency loss in Port Westward Unit 2 in Portland, Oregon. The flexibility allows to adjust quickly when renewable energy – like wind and solar – rise and fall with natural variability.

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    Port Westward Power Plant - Oregon
  • Marquette Energy Center, USA

    When the temperature drops to –40 degrees Celsius, blackouts are not an option. In order to secure a reliable energy supply and enable more renewable energy, Marquette Board of Light and Power (MBLP) in Michigan, USA, opted for Wärtsilä.

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    Marquette  Power Plant - Michigan - USA

Our proudest numbers


to full load


Electrical efficiency

5 000+

MW installed capacity

Technical data of the Wärtsilä 50SG gas engine

Wärtsilä 50SG gas engine - Engine generating set
Cylinder configurations18V
Cylinder bore500 mm
Piston stroke580 mm
Engine speed500 rpm (50 Hz), 514 rpm (60 Hz)
Performance *
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%
Minimum Load
Unit level10%
Plant level1%
* Rated electrical power and electrical efficiencies are given at generator terminals at 100kPa ambient pressure, 25°C suction air temperature and 30% relative humidity, and without engine driven pumps. Power factor 1.0 (site). Electrical efficiency with 5% tolerance. Site conditions, fuel and applicable emission limits may have an impact on performance figures. Please contact Wärtsilä for project-specific performance data. Emission figures for LBF must be evaluated case by case. Catalyst systems are designed based on project specific requirements. Certain fuel components are poisonous for catalyst elements. Maximum amount of these components to be limited in the fuel in applications where catalyst system is installed.
Disclaimer: The information contained herein is provided for informational purposes only and may not be incorporated, in whole or in part, into any agreement or proposal. No representation of any kind is made in respect of any information contained herein and Wärtsilä expressly disclaims any responsibility for, and does not guarantee, the correctness or the completeness of the information. The calculations and assumptions included in the information do not necessarily take into account all the factors that could be relevant in a particular case. Information herein shall not be construed as a guarantee or warranty of the performance of any Wärtsilä technology, equipment or installation.


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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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