One of the absolute essentials of big construction jobs is an outdoor power generator. These are massive pieces of machinery, which need to run all day long, regardless of the weather, to power all of the rest of the heavy machinery, as well as any creature comforts that those on-site need for their break-room and so on.
Outdoor power generators come in a variety of sizes and specifications, so that you don’t need to overspend on one which is too large for your operation. Some of them are capable of processing hundreds of gallons of fuel in a single day, but these are really only suited for big construction jobs, like with a skyscraper. Most smaller ones are better suited to building a home, where they might have one or two power tools running at once, and a single kettle or microwave.