As soon as you've set up a prepayment account, your new card or key is sent by first class post and should arrive in about three days.
Once your card or key arrives, you add credit to it, then slot in into your gas or electric meter to receive energy.
Find out how and where you can add credit to your electricity key or gas card by searching for your nearest top up point.
Get in touch with us on the phone, through Facebook or on Twitter if you lose your card or key, have it stolen, or think it's missing in the post.
What you can do if your credit isn't showing on your meter.
Prepayment meters can offer you a bit of instant credit to help you out in an emergency.
If you have an agreed repayment arrangement with us, your meter can collect what you owe.
How your meter display can tell you what you're paying for your gas and electricity.
For a quick answer you can tweet your question to @EONhelp anytime from 8am-8pm, Monday to Friday or 8am-6pm Saturdays.