Your energy bill is mainly made up of two charges, a unit price and a standing charge.
Your unit price is how much you pay for each unit of energy you use and is calculated on a cost per kilowatt hour (kWh) basis.
The standing charge is a daily fee which is paid no matter how much energy you have used on that day. Standing charges cover the costs of your supplier keeping you connected to the network to supply energy to your home.
Tariffs with no standing charges are available but you may be charged a higher price per kWh.