You will be billed every quarter for all the electricity and any gas you have used in the business. Your utility bills will be sent to your premises.
Until you have been trading for a few months you will not know exactly how much energy the business will use. However, you could contact energy suppliers who may be able to give you an idea of likely consumption, based on the nature of your business, the area of your premises and the type of equipment that you will be using. You can adjust your estimated figures once you have been in business 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.
Energy costs are high and are only likely to keep rising in the future, so if you're fitting your shop premises out from scratch it's wise to build in as many energy-saving features as possible. Even if you're not doing any major shopfitting, a few pounds spent on items such as low-energy lighting could make quite a difference to your bills.