17 days is pretty quick btw;...probably expedited because you’re leccy only. After the official switch-over day you’ll enter an indeterminate period of administrative limbo. .... P.S. if they’ve confirmed that your switch-over date is April 10th then it’s pretty much set in stone. Barring something serious/unforeseen no reason why that date will change.
I'm not convinced about the actual date. The initial documentation I received, very soon after applying to switch (see below), appeared to be 'generic' (i.e. the same they would send to any new customer) and, as you can see, culminated in the statement that on Day 17 I will "be an ESB customer". When I queried this, I received an e-mail which said "...Your go live date will be the 10th...".
Whether EON take a final D/D after your official switch-over date is a bit of a grey area and seems to vary from supplier to supplier. Do you pay EON in arrears or advance?
I don't think that's a question to which there is a simple answer!
My DD has been on a fixed day of the month for years, but their 'accounting years' seem to move around a little (if they have been given a meter reading within a couple of weeks or so of the date they prepare a bill, they seem to take the bill just up to that date, but otherwise they estimate the reading). As a consequence, the relationship between the date of billing and the date of DDs varies ...
... if, for the purpose if argument, a bill showed a zero balance, then if a DD were due to be collected the next day, then I would effectively be paying in advance. However, if a DD has been collected the day before the date of the bill, then I would effectively be paying in arrears - since the next DD would not be until ~1 month after I had started using electricity 'for the year'.
By my estimation, come 10th April I will owe them about £46. My next DD is due to be collected on 16th and, as I've reported, I've turned that down as far as I can on-line (to £93) - so, if they do collect it, they should owe me a refund of around £47.
I’d imagine that if you do supply the final reading to Eon (and ring them at the same time!) you may be able to head them off at the pass and prevent them taking another D/D,....assuming that they were actually going to take another D/D of course. I guess it’s only Eon that can definitively answer your question. ... The conventional wisdom is that whatever happens do not cancel your D/D,...let the administration process run its course no matter how laboured it gets. You’ll always get you credit refunded,...but it can take a while.
Indeed, despite some of the suggestions here, cancelling my DD is not something I've been contemplating. As above, I will owe them a little on changeover day, so it really remains to be seen whether they take the 'full' amount of the DD (now £93) or a figure based on the changeover day meter reading. If the former, then I will probably 'have words' with them in an attempt to ensure that they don't attempt to take any subsequent payments (despite their owing me a small refund!)!
‘Losing’ suppliers have different regimes though,...some can, and do, take further D/Ds as a matter of course after the switch-over date. I could be wrong (often am!) but there are no OFGEM rules to cover this particular issue.
We'll see. I may even be 'pleasantly surprised' since, as I recently wrote, E.ON appear to have been surprisingly good/efficient in making refunds whilst I have been a customer.
As for 'OFGEM rules', I obviously don't know, but in terms of the law in general (and maybe also the DD rules/laws), I imagine that they would probably be on fairly thin ice if they continued to 'collect' money from a customer (by DD) when it was clear that they actually owed the customer money!
Kind Regards, John