Wärtsilä 34SG

The Wärtsilä 34SG is a four-stroke, spark-ignited, lean-burn gas engine generating set. Its agility and flexibility make the Wärtsilä 34SG generating set an excellent choice for both flexible baseload and balancing renewables applications. It also offers a unique fast-starting capability, which enables rapid response to fluctuations inherent to renewable generation.

Download leaflet


Wärtsilä 34SG helps to provide an efficient, reliable and cost-efficient source of energy for power producers. It also provides enough spinning reserve for balancing whenever needed. The Wärtsilä 34SG engine generating set is extremely reliable as it is based on the well-proven Wärtsilä 32 engine, that has a track record from the mid-1990s. The Wärtsilä 34SG features a wide power output range from 5.6 to 9.8 MW, as it is available in 12V, 16V and 20V cylinder configurations.  Wärtsilä engine power plants can be delivered both as EPC and Equipment Delivery contracts.

Key benefits

  • No start cost, limitations nor degradation in number of starts
  • Compact sizing enables transportation to demanding locations
  • Capable of operating in high altitude
  • Runs on natural gas, biogas, synthetic methanol and is capable of hydrogen blending
  • Minimal water consumption
Key benefits robot icon
  • Longer maintenance intervals

Customer stories

  • Paras Energy, Nigeria

    Since deciding in 2009 that its three new power plants would operate with Wärtsilä gas engines rather than gas turbines, the conventional choice at that time in Nigeria, Paras Energy has continued to benefit from that decision.

  • McArthur River Mine, Australia

    The McArthur River Mine in Australia, is one of the world’s largest providers of zinc in bulk concentrate form. Global energy producer EDL is responsible for supplying power to the mine. Wärtsilä has been a trusted partner for EDL for many years now, delivering gas engines and providing lifecycle services for condition-based maintenance to the power plant. The end result is better fuel efficiency, a low levelised cost of electricity, lower OPEX and guaranteed availability.

  • Makuhari, Japan

    The growing demand for natural gas as fuel and the increasing importance of environmental values in Japan have encouraged investments in gas-fired power generation systems. The green point of view has also contributed to the rise of interest towards trigeneration energy sources.

    Makuhari Power Plant, Japan

Our proudest numbers

2 min

to full load


Electrical efficiency

1 000

generating sets delivered

The details

Technical data

Engine generating set
Cylinder configurations12, 16, 20V
Cylinder bore340 mm
Piston stroke400 mm
Engine speed750 rpm (50 Hz), 720 rpm (60 Hz)
Rated electrical power (kW)9 795 (50Hz) 9 388 (60Hz)7 830 (50Hz) 7 491 (60Hz)5 840 (50Hz) 5 580 (60Hz)
Electrical efficiency (%)48.9 (50Hz) 48.8 (60Hz)48.9 (50Hz) 48.7 (60Hz)48.0 (50Hz) 47.8 (60Hz)
Heat rate (kJ/kWh)7 363 (50Hz) 7 374 (60Hz)7367 (50Hz) 7396 (60Hz)7 501 (50Hz) 7 538 (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

Would you like to know more?

Contact us

Contact us

Fill in a contact form and our experts aim to be in contact within 1-2 business days.


Read our leaflet

Read our product brochure to get all the details.


Find your local office

Find a Wärtsilä office near you.

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)


By checking this box you agree to receive communications for marketing purposes. You can unsubscribe at any time.

Read more about how we process data in our Legal & Privacy Notice

Related solutions and services

Insights - news and articles

Mikko Pulkkinen Wärtsilä
22 SEP 2022 Article
3 min read

The 5 key lessons learned from collaborations and partnerships

Collaboration between companies of different shapes and sizes can open up...
Arttu Pyysing - Work that matters - thumbnail
8 SEP 2022 Article
3 min read

Work that matters

At Wärtsilä, Business Intelligence Analyst Arttu Pyysing is doing something he cares deeply about: advancing the energy...
Heikki Vepsäläinen Sushil Purohit Wärtsilä
1 SEP 2022 Article
4 min read

The Global Shift to Renewable Energy — How collaboration between companies can create new opportunities on the drive to net zero

The global shift...

Wärtsilä Energy. Let's connect.