I switched to Bulb last month and am very glad I did - they've lowered their rates while others are raising them, and it's good to know they provide renewable energy too. I plugged in my numbers on an estimator on another site and it said I could save as much as £200 a year with their rates. They've lowered them twice this year.
They also give you £50 credit on joining and then another £50 each time you refer someone else!
Get a quote here bit.ly/2vAMiMB
Please ask me if you have any questions about the switching process or for the news websites where they announce their lowering prices. The Telegraph has run an interesting article:
www.telegraph.co.uk/news/2017/08/28/loyal-energy-customers-853-worse-five-years/