The direct debit amount will normally be calculated on the basis of your actual or projected annual energy bill and divided into 12 equal monthly instalments. This amount is normally reviewed once a year and your monthly payments are adjusted accordingly.
Advantages

  • Allows you to budget more effectively and to spread your payments over the course of the year;
  • Ensures that you will not forget to pay your bills, hence avoiding potential hassles with payment reminders and disconnection notices;
  • Direct Debit payments are protected by the Direct Debit Scheme;
  • It is almost always the cheapest way to pay.

Potential Disadvantages

  • The only downside with monthly direct debit is that you give up some flexibility in the way you manage your finances.