Wärtsilä
Wärtsilä 20V31SG
31SG
Wärtsilä 20V31SG — 649.1 L V20 four-stroke lean-burn spark-ignited gas engine generating set (Wärtsilä 31SG), for power plants. 11779 kWe at 750 rpm / 50 Hz, 11377 kWe at 720 rpm / 60 Hz; electrical efficiency 51.5%.
Overhaul & repair parts- Manufacturer files
- 2 datasheets
- Last updated
- 2026-06-08
- Package route
- gas generator sets
- Prime Power · 50 Hz
- 14,724 kVA
- Electrical Output
- 11,779 kWe
- Cylinders
- V20
- Displacement
- 649.1 L
- Rated Speed
- 750 / 900 RPM
Power Ratings
kWm = mechanical shaft power · kWe = electrical output · kVA = kWe ÷ 0.8 pf
50 Hz750 RPM
| kWm | kWe | kVA | |
|---|---|---|---|
| Prime Power | — | 11779 | 14723.8 |
60 Hz900 RPM
| kWm | kWe | kVA | |
|---|---|---|---|
| Prime Power | — | 11377 | 14221.3 |
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Wärtsilä 20V31SG generator set context
The Wärtsilä 20V31SG is listed here as a natural gas generator-drive engine for 50 Hz and 60 Hz generator sets, with a headline 14,724 kVA / 11,779 kWe / prime rating. Use this page to compare the published engine output, electrical kWe/kVA ratings, emissions level, datasheet availability, and neighboring models before specifying an alternator, controller, enclosure, voltage, and compliance package.
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Technical Specifications
| Brand | Wärtsilä |
| Model | 20V31SG |
| Series | 31SG |
| Configuration | V20 |
| Cylinders | 20 |
| Displacement | 649.1 L |
| Fuel Type | Natural Gas |
| Ignition Type | Spark Ignition |
| Cooling Method | Liquid-Cooled |
| Emissions Standard | Unregulated |
| Country of Origin | Finland |
Frequently asked questions
What is the power output of the Wärtsilä 20V31SG?
The Wärtsilä 20V31SG is rated at 14,724 kVA prime at 50 Hz (750 rpm); and 14,221 kVA prime at 60 Hz (900 rpm).
Does the 20V31SG run at 50 Hz or 60 Hz?
The Wärtsilä 20V31SG is available for both 50 Hz (750 rpm) and 60 Hz (900 rpm).
What fuel does the Wärtsilä 20V31SG use?
The Wärtsilä 20V31SG is a Natural Gas generator-set engine.
What is the displacement and cylinder configuration of the 20V31SG?
The Wärtsilä 20V31SG is a V20 (20-cylinder) engine with a displacement of 649.1 L.
What is the catalog status of the Wärtsilä 20V31SG?
The Wärtsilä 20V31SG is marked active in this database. Confirm current production and availability with the manufacturer; catalog status is not a live supply check.
Are reference documents available for the 20V31SG?
This page links reference documents for the Wärtsilä 20V31SG. Check each document's title, model coverage, revision and rating conditions before using it for selection.