If you have business premises you will be billed every quarter for all the gas and electricity you have used in the business.
Until you have been trading for a few months you will not know exactly how much energy the business will use. If you plan to use an electric milk float you will have the cost of recharging the batteries. According to industry sources, a fully charged battery will give you a range of between 60 and 80 miles, with overnight charging taking eight hours or so. The float supplier will be able to give you an estimate of how much the float costs to run. You can adjust the figures once you have been trading for a few months.
It's worth shopping around the different energy companies to get the best deal for your business, particularly if you're going to be a heavy energy user.