Where I live in the US, the power company is National Grid, headquartered in London. I believe that customers can select a different energy supplier, while payi

Where I live in the US, the power company is National Grid, headquartered in London. I believe that customers can select a different energy supplier, while paying National Grid for connection and delivery. So it sounds like you are talking about a similar system. I'm not sure of the state of the market, and I've never tried changing my supplier, but I do notice the electricity supply rate has more than doubled year-over-year. My understanding is that most of the power here comes from Canadian hydro, so that seems to tell you something about the usual explanations for price changes.