# Internal combustion engines and gensets: Equipment and suppliers Blocks, turbochargers and alternators inside a genset Source page: https://www.materialinsights.org/energy/e_engines/equipment/ What this tab covers For each method, the main pieces of equipment, who makes them (by region) and what they are made of (bill of materials). A genset is an engine, an alternator and a control system; a vehicle engine pairs the same core with a gearbox. Key enabling parts are fuel injection, turbochargers and aftertreatment. #### Diesel and gas gensets **Reciprocating engine**^[1](https://dieselnet.com/news/2024/04weichai.php)^[3](https://www.wartsila.com/energy/solutions/engine-power-plants/wartsila-50sg-gas-power-plant)^[4](https://www.powermag.com/engine-power-plants-surge-as-data-centers-drive-unprecedented-demand/)^[13](https://www.sec.gov/Archives/edgar/data/26172/000002617226000009/cmi-20251231.htm) Converts fuel to shaft power. United States Caterpillar, Cummins Europe Wärtsilä, INNIO Jenbacher, Rolls-Royce Power Systems (mtu), Everllence, Volvo Penta China Weichai Power Bill of materials - **Block, heads and crankshaft**: cast iron and forged steel - **Cylinders**: up to 500 mm bore in the largest gas engines - **Turbocharger and fuel injection**: high-temperature alloys and precision steel **Alternator**^[4](https://www.powermag.com/engine-power-plants-surge-as-data-centers-drive-unprecedented-demand/)^[11](https://investors.generac.com/news-releases/news-release-details/generac-reports-fourth-quarter-and-full-year-2025-results)^[12](https://www.equipmentworld.com/business/article/15704847/kohler-energy-changes-name-to-rehlko)^[13](https://www.sec.gov/Archives/edgar/data/26172/000002617226000009/cmi-20251231.htm) Synchronous generator turning the crankshaft's rotation into AC at grid frequency. United States Caterpillar, Cummins, Generac, Rehlko (formerly Kohler Energy) Europe Rolls-Royce Power Systems (mtu), Volvo Penta Bill of materials - **Stator and rotor**: copper windings in laminated electrical steel **Controls, switchgear and fuel system**^[4](https://www.powermag.com/engine-power-plants-surge-as-data-centers-drive-unprecedented-demand/) Synchronise sets to the grid or a load, start them automatically and store fuel. Europe Wärtsilä, INNIO Jenbacher United States Caterpillar Bill of materials - **Grid-forming batteries in hybrid plants**: for example 1.1 GWh with a 4 GW Caterpillar project #### Petrol and diesel vehicle engines **High-efficiency engine**^[1](https://dieselnet.com/news/2024/04weichai.php)^[2](https://www.mobilityengineeringtech.com/component/content/article/43504-sae-ma-02815)^[13](https://www.sec.gov/Archives/edgar/data/26172/000002617226000009/cmi-20251231.htm) Delivers wheel torque; peak efficiency set by compression, combustion and friction. Japan and Korea Toyota China Weichai Power United States Cummins Bill of materials - **Cylinder block and head**: aluminium or cast iron; 80.5 x 97.6 mm bore and stroke in Toyota's 2.0-litre - **Aftertreatment**: catalysts and particulate filters to meet China VI and Euro VI rules #### Sources 1. [Weichai unveils diesel engine with 53.09% brake thermal efficiency](https://dieselnet.com/news/2024/04weichai.php) DieselNet, 2024 2. [Toyota Unveils More New Gasoline ICEs with 40% Thermal Efficiency](https://www.mobilityengineeringtech.com/component/content/article/43504-sae-ma-02815) SAE Mobility Engineering, 2018 3. [Wärtsilä 50SG gas engine power plant](https://www.wartsila.com/energy/solutions/engine-power-plants/wartsila-50sg-gas-power-plant) Wärtsilä, 2025 4. [Engine Power Plants Surge as Data Centers Drive Unprecedented Demand](https://www.powermag.com/engine-power-plants-surge-as-data-centers-drive-unprecedented-demand/) POWER Magazine, 2026 5. [Generac reports fourth quarter and full-year 2025 results](https://investors.generac.com/news-releases/news-release-details/generac-reports-fourth-quarter-and-full-year-2025-results) Generac Holdings, 2026 6. [Kohler Energy changes name to Rehlko](https://www.equipmentworld.com/business/article/15704847/kohler-energy-changes-name-to-rehlko) Equipment World, 2024 7. [Cummins Inc. Form 10-K for fiscal year 2025](https://www.sec.gov/Archives/edgar/data/26172/000002617226000009/cmi-20251231.htm) Cummins / US SEC, 2026 ## Other sections - [Summary](https://www.materialinsights.org/energy/e_engines/index.md) - [Overview](https://www.materialinsights.org/energy/e_engines/overview/index.md) - [Correlation](https://www.materialinsights.org/energy/e_engines/correlation/index.md) - [Science and limits](https://www.materialinsights.org/energy/e_engines/science/index.md) - [Value chain](https://www.materialinsights.org/energy/e_engines/valuechain/index.md) - [Unit economics](https://www.materialinsights.org/energy/e_engines/economics/index.md) - [Engineering methods](https://www.materialinsights.org/energy/e_engines/methods/index.md) - [Relationships](https://www.materialinsights.org/energy/e_engines/links/index.md)