Worldwide Power Products offers a wide selection of quality commercial and industrial-grade diesel generators for sale ranging in sizes from 20kW – 2500kW. We offer new and used generators from major brands such as Caterpillar, Cummins, MTU, Multiquip, HIPOWER, Kohler, Detroit Diesel, Generac and more. Whether you seek portable or stationary diesel generators―for prime, continuous or standby usage―we can ensure you find what you are looking for. The simplest explanation of a generator’s function: it provides electrical power. A diesel generator is the combination of a diesel engine with an alternator (also called a generator end) to generate electrical energy. This alternator houses electrical conductors which react to the engine’s mechanical energy and convert it into useful electrical power.