The list is long. Initially I placed 4 sites with Npower (one they already supplied). They failed to register the sites. When chased it took some time to get them registered. I raised 2 complaints which failed to have any effect. When I then complained on their website I was contacted within 30 minutes. This time things started to happen, though the person I dealt with showed limited empathy and insisted on going through all the same checks everytime we spoke despite the many months of debate we had. However they then set the contracts up to align with the dates they had registered them NOT the date on the legally binding contract. Once again it took some time and some convincing that this is what they should do. Agreeing compensation for the fact that the customer was on out of contract rates for many months due to their failure took ages. Now the bills make absolutely no sense because they have gone through a number of cancel rebill processes. And in some cases are over 60 pages long despite these being really simple nHH meters. I have recently been promised a statement of account to help me understand the bills but this has not been forthcoming. All in all this has been a disaster. the culture of Npower seems to be one of never admitting responsibility or liabilty irrespective the clarity of the error. The general tone of conversation generally lacks any empathy again despite the facts. Accessing Npower is likewise very difficult, long hold times, excessive security, no notable records held of previous discussions so each time you start again. I have resisted taking this approach for over a year but can resist no longer.