Terrible experience. I switched via the Big Switch to do my bit. I wish I'd read reviews first, but thought green must be ethical right? Was happy to pay 20% more than existing supplier to be green. The website says prices won't go up for 12 months. Very quick with the automated emails, but try getting through on the phone or getting a reply to an email. An email autoresponder says we'll get back to you within 24 hours, or a little longer if we're busy. It's been 3 weeks and no reply. Meanwhile I've switched again. Why? Because Ecotricity said they've had to "adjust" their prices, putting them up 40%! I "enjoyed" one week at the original price the three weeks at 40% more. A bill of £330 in a month! They also did not set up the direct debit and are chasing me for a manual payment. I think I'll settle when they respond to me.