In message , at 14:19:24 on Fri, 1 Nov 2013,
Gefreiter Krueger remarked:
http://www.edfenergy.com/products-se...me/my-account/
ways-
to-pay.shtml

Never heard of it. So you simply pay exactly what you use, no chance of
having to change things or owe anybody anything?

Yes. Just because you've never heard of it doesn't mean it doesn't exist.
It has existed for decades.

It isn't used by many, and I can't think why you would.

Because you get a discount (the energy company gets its money quickly
and reliably) and because you don't want the faff of having to mail them
a cheque.
--
Roland Perry