nPower keeps coming up cheapest for me, apparently £264.35 cheaper a year... And if I am comparing the unit rates, I currently pay on British Gas;
Gas 3.83p / 26.01p standing charge
Electric 12.20p / 26.00p standing charge
nPower say
Gas 2.31p / 17.60p standing charge
Electric 10.58p / 17.60p standing charge
So they are clearly cheaper, although exit fees of £20 per fuel, It is not massively difficult to find a lot more cheaper suppliers than my British Gas tariff looking at those figures, I don't have an exit fee on current tariff so can just switch but worried about nPower given they get so many bad reviews, anyone on here using them? The app they made looks decent.
I have a smart meter for electric and gas so I know i'll lose the smart functionality by swapping to anyone other than Sainsburys Energy, who would still save me a bit as they have the same standing charge as BG that I pay now, but unit rates are a bit cheaper.
Basically, top 3 in the 'saving' are nPower, SSE & Places for people energy.