The Office of Gas and Electricity Markets (Ofgem) monitors, and publishes information about gas and electricity prepayment customers. However, prepayment data are published for England, Scotland and Wales or, by individual energy supplier, not on a parliamentary constituency basis. In September 2008, the last period for which data have been published, the number of customers in England using prepayment meters was two million for gas and 2.9 million for electricity.