Natural gas is the dominant fuel in the gas genset market due to its widespread availability, lower cost (often), and cleaner combustion compared to diesel or gasoline. The natural gas genset market includes engines that operate on the Otto cycle (spark-ignited), similar to a car engine. Natural gas gensets are used for standby backup, peak shaving, and combined heat and power (CHP). As environmental regulations tighten, the natural gas genset market is growing, particularly for "lean-burn" engines that reduce NOx.

The broader gas genset market is the overall category. The natural gas genset market for "stoichiometric" engines (air-fuel ratio exactly balanced) use a three-way catalyst (similar to a car) to reduce emissions. The natural gas genset market for "lean-burn" engines (excess air) produce lower NOx without a catalyst, but require a higher compression ratio. The natural gas genset market for "turbocharged" and "aftercooled" engines improve efficiency.

The natural gas genset market for "spark plugs" and "ignition" systems are a maintenance item. The natural gas genset market for "closed crankcase ventilation" (CCV) prevents oil mist from entering the atmosphere. The natural gas genset market for "exhaust" system must be designed for the lower exhaust temperature of natural gas (compared to diesel).

The natural gas genset market for "engine" protection includes sensors for detonation (knock), misfire, and high exhaust temperature. The natural gas genset market for "knock" detection allows the engine control unit (ECU) to adjust timing to prevent engine damage. The natural gas genset market for "methane" slip (unburned methane in the exhaust) is a greenhouse gas concern.

The natural gas genset market for "fuel" quality is important. Natural gas composition varies by source; the Wobbe index (a measure of energy content) should be within specifications. The natural gas genset market for "low-BTU" gas (e.g., from biogas) may require engine modifications.

Looking ahead, the natural gas genset market will see the adoption of "pre-chamber" ignition systems for ultra-lean combustion. The natural gas genset market for "hydrogen" blending (up to 20-30% by volume) is possible with some engine modifications. The natural gas genset market for "100% hydrogen" engines will require significant changes (fuel injection, pre-ignition control). As the gas grid decarbonizes, the natural gas genset market will adapt.

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