Wärtsilä 50DF multi-fuel engine

The Wärtsilä 50DF multi-fuel engine is a four-stroke multi-fuel engine generating set. It allows instant switching to alternative fuels, should price instability or delivery challenges affect the use of the primary fuel.

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The Wärtsilä 50DF multi-fuel engine operates on the lean burn principle, which reduces peak temperatures and lowers NOx emissions considerably. High efficiency in a small footprint combined with great reliability and flexibility makes this solution ideal for various applications. Wärtsilä engine power plants can be delivered both as EPC and Equipment Delivery contracts.

Key benefits of the Wärtsilä 50DF multi-fuel engine

Icon - fuel
  • Ensures energy security in operation through fuel flexibility and seamless switching between fuels
  • Can operate on natural gas or any liquid fuel, including HFO
  • Low emissions in gas mode meets even the most stringent emission limits
Engine icon
  • Robust, reliable genset, proven in the most challenging environments
  • Fast-starting capability which enables rapid response to fluctuations
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Customer stories

  • AGL Energy Limited, Australia Barker Inlet Power Station

    A step ahead Down Under – 211 MW Dual Fuel flexible power plant ensuring reliability in the renewable-heavy South Australian power system.

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    AGL Energy Limited, Australia Barker Inlet Power Station
  • PLTD Pesanggaran, Bali

    Grid stability in Indonesia – 200MW multi-fuel power plant generating reliable electricity in Bali with operational and fuel flexibility.

    Read more
    Pesanggaran - Bali
  • 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
  • Quisqueya I & II, Dominican Republic

    In September 2011, Barrick Gold Corporation acquired a majority share in a gold mine located some 100 kilometres from the Dominican capital, Santo Domingo. The mining company quickly placed an order for a state-of-the-art Wärtsilä power plant to satisfy the needs of their new power-hungry mine

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    Quisqueya Power Plant - Dominican Republic

Our proudest numbers

30 sec

Connection to grid


Electrical efficiency

5 000

kW Installed capacity

The details

Technical data


Wärtsilä 50DF multi guel 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)17 635 (50Hz) 18 190 (60Hz)
Electrical efficiency (%)GAS: 49.4 (50Hz) 49.3 (60Hz)LFO: 48.2 (50Hz) 47.7 (60Hz)
Heat rate (kJ/kWh)GAS: 7 285 (50Hz) 7 305 (60Hz)LFO: 7 474 (50Hz) 7 545 (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. 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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