This may be of interest
First Utility and Shell Energy customer score
Our latest energy companies satisfaction survey was conducted before First Utility changed its name to Shell Energy. However, existing customers remain on the same tariffs and prices (albeit with renewable electricity), with the same customer service. So it's still useful to see how First Utility's customers rate their supplier.
First Utility came joint 16th out of 30 energy companies rated by 7,429 members of the public in the annual Which? energy supplier satisfaction survey - the biggest of its kind. The other company it tied with is Co-operative Energy.