Be warned - Ovo were excellent on prices but not on service. I had a smart meter fitted which upset my Burglar Alarm [and neighbours] I complained to Ovo that the meter had caused it.. had a very nice responce - don't worry - get an electrician to confirm it is the meter and we will refund you... paid £72.. electrician confirmed meter was causing it and managed to get alarm working for a very short time by by-passing it - told ovo reply was we won't be paying you as your alarm is now working and wanted another letter from electrician who was disgusted and refused to do one ..even though it was only working with the meter off. Changed suppliers - [this was 3 years ago] but didn't expect being a lady pensioner I would still be having to climb a ladder to read my electric meter because the Ovo smart meter is still there turned off so can't read it!!