Electric equipment is limited to the power drawn from the power outlet (which is usually a standard residential power capacity or from its own battery). For advanced pressure washers such as those used in the manufacturing plant, the power capacity for the equipment may be bigger that can be supplied by establishments this size.
Gasoline engines are only limited by its size and cost. Unlike residential homes, there’s no breaker that might blow if you’re overusing it. Gasoline burns more energy than batteries since it has a bigger combustion chamber.