To me OVO stands for Zero v Nil for its illegal OVO-billing, et al. Several times I got billed exactly the amount I just paid them, so go figure that! In exasperation I just now decided to Google 'OVO Reviews' after having a torrid time of late with this so-called energy provider, including experiencing an unlawful bounced refund cheque. Currently awaiting a replacement but already its well overdue with my expectations shot. Glad to find others having issues with them...something smells really badly there, really really 'off'. My guess is they are rapidly heading for bankruptcy. Whatever you do from hereon in, DO NOT KEEP FEEDING THESE BOTTOM FEEDERS LIKE I HAVE! The next thing now is for me to decide to switch to another provider regardless, or file with the Energy Ombudsman (https://www.ombudsman-services.org), or report fraud to the police or wait for OVO to go under then the government will assign my account once again. I'm a former SSE account so have been here before. Things seems to be going from bad to worse in the domestic UK energy biz, like watching a car crash in slow motion coming towards us customers. And it's not Russia causing this but fake British companies calling themselves electricity suppliers. !@£$%^^&*(!