Something to bear in mind with these meters is that, as NoseOverTail said, they are often installed when a person gets behind with their bills, sometimes the company will do this as a last step before disconnection. The thing is, very often in that situation, the meter will be set to recover, from each fresh recharge of the card or token, a portion of the debt owing, so effectively the electricity or gas will be more costly than it needs to be. If you keep the meter or if you have it removed, it would be a good idea to get this aspect straightened out, they may need to send a person to alter the meter setting and take account of any overpayment you may have already made. Also the meter will collect the "standing charge" - the fixed quarterly charge. They usually do this on the same day every week, so sometimes a newly charged card won't get you as much connection time as you expected.