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. Your energy supplier may be able to give you some guidance, based on the size of your centre and the nature of the heating, lighting and any equipment you will be using. If you intend to operate an indoor facility, your energy costs - particularly lighting - could be substantial. You can adjust the figures once you have been in the premises for a few months. If you're buying an existing centre, the vendor should be able to give you a good idea about the level of energy costs to expect.
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.
It may be worth looking into renewable energy alternatives such as solar PV or LED lighting. These typically require more initial capital investment but may reduce your energy expenditure in the long term.