Businesses in the generators category supply equipment that produces electricity when mains power is unavailable, unreliable or insufficient. Offerings can include portable petrol or diesel units, larger standby generators for buildings and industrial sites, and specialist equipment for construction, events, agriculture and emergency use. Some suppliers also provide associated items such as transfer switches, distribution boards, cables, fuel tanks and sound-reducing enclosures. Services may include hiring generators for temporary use, advising on capacity and configuration, delivery and setup, installation of permanent standby systems, and connection to existing electrical infrastructure. Businesses may carry out routine servicing, inspections, fault diagnosis and repairs, as well as supply replacement parts and arrange refuelling.