The stress of changing energy suppliers is something I could do without. Being on a fixed income (like most of us here), it's the worry that the new supplier isn't being paid the correct amount and that I'd be left with a large bill down the line.
Last year a new tenant moved into a nearby flat, signed up to her energy supplier, who, because we have similar but not identical addresses, promptly cancelled my direct debit without contacting me. Took a while and those interminable phone calls to sort out. Likewise a friend changed suppliers and despite her calls saying she wasn't paying enough, a year later they found they'd made a mistake at set-up, and had 2 accounts for her, one of which had no money going into it!