A generator set, also known as a genset or generator, is a device used to generate electrical power. It consists of an engine, typically fueled by diesel, natural gas, gasoline, or propane, and an alternator or generator head that converts mechanical energy into electrical energy. Generator sets come in various sizes and configurations, ranging from small portable units suitable for powering tools or providing backup power for homes, to large industrial units used for prime or standby power in commercial and industrial applications.

They are essential for providing electricity in situations where grid power is unavailable, unreliable, or insufficient, such as during power outages, remote construction sites, outdoor events, or off-grid locations. Generator sets can be equipped with automatic transfer switches to seamlessly switch between grid power and generator power during outages, ensuring uninterrupted electricity supply. Regular maintenance and proper sizing are important considerations to ensure the reliable performance and longevity of generator sets.