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Wärtsilä 31SG
The Wärtsilä 31SG sets a new standard in efficiency, operational flexibility and reliability & serviceability

The Wärtsilä 31SG is here to provide a step change!

The Wärtsilä 31SG engine sets a new standard in gas engine based power generation. Technological advancements in efficiency and O&M will result in reduced overall lifecycle cost for power plants based on Wärtsilä 31SG.

Your best choice for a power plant

Sharpening the edges of value - Wärtsilä 31SG


Sharpening the edges of value  - Wärtsilä 31SG

Efficiency is a key element in modern power generation. We want to improve the efficiency of our customer's operations. By bringing the Wärtsilä 31SG gas engine to the market we enable our customers to make a leap in efficiency and decrease total lifecycle cost.

New features and performance

What the new Wärtsilä 31SG offers

    Wide load range
    Two stage turbocharging
    Gas, oil & dual fuel versions
    • Hydraulic valve mechanism
    Next generation engine control system
    Improved output
    Improved efficiency
    Reduced emissions
    Higher availability
    Longer component lifetime

    What you get

      Lower overall lifecycle cost 
      Low load operation for spinning reserve 
      Fast start-up, loading and unloading for dynamic electricity markets 
          - 2 minutes to full load from standby 
      Power density through higher output 

      The wartsila 31SG engine


      The highest efficiency internal combustion engine

      Digitally controlled fuel injection

      Fully adjustable semi-hydraulic valve actuation (VIC/VEC)
          - Variable inlet valve timing
          - Variable exhaust valve timing

      2-stage turbocharging system

      New generation UNIC engine control system

      Wärtsilä 31-Efficiency

      All areas related to efficiency have been improved on the Wärtsilä 31SG enabling the step change in efficiency

      Turbocharging system

      • 2-stage turbocharging enables high efficiency throughout the entire load range

      Serviceability improved by use of cartridge concept for compressor and turbine removal

      Turbocharging system

      2-stage turbocharging system enables higher efficiency and improved operating flexibility

      In Search of Excellence

      Quality focused product development process – 5 years project

      Want to know more about the Wärtsilä 31SG?

      Wärtsilä's R&D team has worked hard for many years to develop this state-of the-art engine. The core of the design is based on Wärtsilä’s long and strong market knowledge and understanding of customer needs. Quality has been the basis of the R&D process from the very first steps.


      News & press releases


      Contact info

      If you want to know more about the Wärtsilä 31SG, please contact

      Niklas Wägar
      Director, Technology and Product Management
      Wärtsilä Energy Business

      © 2019 Wärtsilä