Wärtsilä 31DF

The most efficient Wärtsilä 31DF, is a four-stroke multi-fuel engine generating set.

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Wärtsilä 31DF multi-fuel engine generating set

The record-breaking efficiency and fuel adaptability of Wärtsilä 31DF has been designed for applications where energy security is significantly important and where gas network is still forthcoming. Its modular design ensures easy adaption for the engine to run on renewable fuels. Wärtsilä engine power plants can be delivered both as EPC and Equipment Delivery contracts.

Key benefits

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  • World-class open-cycle efficiency
  • Synchronises with the grid within 30 seconds from start command
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  • Ensures energy security in operation through fuel flexibility and seamless switching between fuels
  • Can be easily adapted to run on synthetic renewable fuels
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  • Supports off-grid operation and provides fast black start capabilities
  • Unparalleled load following capabilities and high part load efficiency

Our proudest numbers

2 min

to full load


Electrical efficiency


million running hours with Wärtsilä dual fuel technology

The details

Technical data

Engine generating set
Cylinder configurations 20 V
Cylinder bore310 mm
Piston stroke430 mm
Engine speed750 rpm (50 Hz), 720 rpm (60 Hz)
Rated electrical power (kW)10 777 (50 Hz) 11 377 (60 Hz)10 777 (50 Hz) 11 377 (60 Hz)
Electrical efficiency (%)50.2 (50 Hz) 50.2 (60 Hz47.9 (50 Hz) 47.9 (60 Hz)
Heat rate (kJ/kWh)7 170 (50 Hz) 7 175 (60 Hz7 510 (50 Hz) 7 515 (60 Hz
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) < 2
Ramp rate (hot, load/min)> 100%
Minimun Load
Unit level 20%
Plant level 1%

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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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