# Gas engine generator set

Canonical URL: https://eloragrid.ai/symbols/gas-engine-generator-set
Publisher: Elora Grid
Updated: 2026-10-28
Lookup label: GG
Drawing use: SLD
Reference families: IEC, IEEE / ANSI, Manufacturer

A spark-ignited reciprocating engine on natural gas, biogas or LPG driving an alternator, shown as a generating source.

## In plain English

### What does Gas engine generator set mean?

A gas engine generator set uses a spark-ignited reciprocating engine running on natural gas, biogas, landfill gas or LPG. These sets are common in combined heat and power plants, prime power microgrids and sites with a reliable gas supply, and they are often run continuously rather than only as backup.

### A simple example

Single-line diagrams draw the alternator circle with an engine block marked G or GAS, the generator breaker, and sometimes heat recovery references. When several sets run in parallel, a common synchronising bus and a load-sharing controller appear alongside.

### What the drawings help you do

Gas engines usually accept large load steps less readily than diesel engines, which affects how a microgrid sequences load after a blackout. The symbol does not express block-load acceptance, gas pressure requirements or emissions limits.

### This particular reference

A spark-ignited reciprocating engine on natural gas, biogas or LPG driving an alternator, shown as a generating source. A gas engine set uses spark ignition and gaseous fuel; a gas turbine generator uses a continuous-combustion turbine.

### Terms

- Schematic: A drawing showing function and connections rather than physical appearance.

Concept diagram: Identify the device and form → Read the connections and state → Check the equipment reference
A guide to reading this reference. The original symbol illustration and its drawing notes appear below; these boxes are not a wiring diagram.

- [Generator switchgear and paralleling controls](https://www.cummins.com/en-na/generators/products/switchgear)
- [Reliable hybrid power and microgrid solutions](https://www.deif.com/applications/power-generation/reliable-hybrid-power-and-microgrid-solutions/)


## What it represents

A gas engine generator set uses a spark-ignited reciprocating engine running on natural gas, biogas, landfill gas or LPG. These sets are common in combined heat and power plants, prime power microgrids and sites with a reliable gas supply, and they are often run continuously rather than only as backup.
Single-line diagrams draw the alternator circle with an engine block marked G or GAS, the generator breaker, and sometimes heat recovery references. When several sets run in parallel, a common synchronising bus and a load-sharing controller appear alongside.
Gas engines usually accept large load steps less readily than diesel engines, which affects how a microgrid sequences load after a blackout. The symbol does not express block-load acceptance, gas pressure requirements or emissions limits.

## How to read it

- Check the load-step limits in the controller documents before assuming the set can pick up a whole bus at once.
- Heat recovery or CHP notes indicate continuous running.

## Information to show or reference

- State fuel type and rating basis.
- Show breaker and synchronising arrangement.
- Reference load acceptance and start sequence.

## Important distinction

A gas engine set uses spark ignition and gaseous fuel; a gas turbine generator uses a continuous-combustion turbine.

## Facts

- Prime mover: Spark-ignited reciprocating engine
- Fuels: Natural gas, biogas, LPG
- Typical role: Prime power or CHP
- Preview: Independent educational illustration; not a manufacturer outline

## Public references

- [Generator switchgear and paralleling controls](https://www.cummins.com/en-na/generators/products/switchgear) — Cummins. Public generator paralleling and switchgear context.
- [Reliable hybrid power and microgrid solutions](https://www.deif.com/applications/power-generation/reliable-hybrid-power-and-microgrid-solutions/) — DEIF. Public hybrid microgrid context combining gensets, solar, storage and mains.

## Graphic scope

Independent original educational concept illustration by Elora Grid. Not a certified standards graphic or manufacturer footprint. Unitless; not to scale. Original artwork licence: https://creativecommons.org/licenses/by/4.0/. Publisher material is linked only.