It would be 0 stars if that was an option to rate OVO. Awful service. Too expensive. You don't know / understand what they charge - how they make up tariffs. You get charged even for energy you don't use. The bills are very difficult to understand. The standing charge is supposed to (I learned today from an OVO adviser) cover from the maintenance of the meter. What do they do to maintain a meter? I have an old meter and I have asked many times for them to come and investigate as they said it is overclocking! Why am I being charged for the maintenance? Prices change every month. they blame OFGEM. They put you without your consent on the tariffs that are not suitable to you. They also charge the same rates for day and night rates. Costumer service is hopeless as they have been trained to say what the company tells them to say - basically not really helpful. It takes long time to get through to them and most important issues never get resolved. OVO causes a lot of STRESS!!!