Just click on the uSwitch link below to go to their website where you can check the different ones available and what savings could be made.

uSwitch

Even better, you could change your electricity supplier/tarrif to one which is more green. Some suppliers generate more electricty using renewable sources.

Further savings may be available if you change supplier through a cash back website.

The best one is probably TopCashBack - click on the link below if you would like to join for free.

Top Cashback