My energy costs are like Marelli's. £85 a month at present, and I'm slightly in credit, so it will reduce in the next month or so to about £75 a month. I'm with British Gas now - I switch every couple of years to take advantage of offers. Last month, I changed tarriff and obained an EnergySmart meter, which enables me to check electricity consumption each time I switch on an appliance. Online, I can check usage and adjust what I want to spend eg I want to reduce the bill by 10%, so the SmartMeter and my account will tell me if what I am doing is working.
Tegan it might be worth switching now, even if there is a penalty, as you might save more by switching, and the new company will organise whatever is owed you to be reimbursed.