The effeciency of home solar panels in Durham is effected by a number of factors. The most significant being Durham's geographical location, local weather patterns, and the attributes of the individual property which will include roof orientaion and pitch.
Whilst considering that solar panels in the North of England will, on average, achieve approximately 86.2% of the efficency of those in the very South West of England , Durham's solar panel efficency will exceed these average figures due to the climate characteristics of most of the Durham area.
Also note that Durhams solar panel installations cash returns should exceed the figures estimated in our feed in tariff calculator, since that also uses a N.England average.