The Wärtsilä 31SG Balancer is a four-stroke, spark-ignited, lean-burn gas engine generating set. It is designed to provide flexible grid capacity even in adverse weather conditions and enable renewables to perform as the lowest-cost, most resilient power source for grids worldwide.
The Wärtsilä 31SG Balancer offers 8% more power and over 50% efficiency, lowering the cost and risk of the renewable transition through flexible, resilient capacity. The new engine technology is designed to provide power producers with fast-ramping balancing power, which can be scaled up as the share of renewables in power systems increases. The engine can start and ramp up rapidly to support intermittent renewable generation so that the lowest cost cleanest energy technology can become the dominant power source.
With our cost-efficient plant construction based on prefabricated, high-quality power plant modules, you can start generating power faster. The design allows you to pick and choose the desired functionality and equipment based on your project need.
The heart of the plant is the power unit that consists of the engine and the essential equipment. This can be installed on location in days instead of weeks to start generating power more quickly for lower costs and faster ROI. The power unit can be complemented with process modules that enable easy integration of auxiliary equipment, process media, and filtration. We also provide electrical modules that enable integration of the low voltage and medium voltage systems.
Power to grid
|Engine generating set|
|Cylinder bore||310 mm|
|Piston stroke||430 mm|
|Engine speed||750 rpm (50 Hz), 720 rpm (60 Hz)|
|Wärtsilä 31SG Balancer|
|Rated electrical power (kW)||12 762 (50Hz) 12 372 (60Hz)|
|Electrical efficiency (%)||50.2 (50Hz) 50.3 (60Hz)|
|Loading and unloading|
|Connected to grid||Full load|
|Regular start time (min:sec)||00:30||< 5:00|
|Fast start time (min:sec)||00:30||< 2:30|
|Shut-down time (min)||< 2|
|Ramp rate (hot, load/min)||> 100%|
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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