Does any one thing it's worth doing a Subject Access Request to givenergy to get your data?
I'm thinking that if they get flooded with requests to supply you with every scrap of data they hold on you... which would include ALL of the logged data for your devices... it might be a way to tell them to go fuck themselves.
They have a legal responsibility to respond to SAR requests and cannot charge you for the data.
Maybe everyone should do that.