I would be very, very careful. Promises are made and fools rejoice, a saying that is doubly true in this case. The alternative supplier will offer you a lower price, but will somehow forget to add that he will add elsewhere. The price does not only consist of the price of electricity, but you also pay for the distribution network and the other energy supplier will of course pay for its use and charge you for it. Personally, as soon as I'm approached with such an offer, I'll hang up. What is "a lot saved"? I haven't heard of any dizzying savings from people who have changed suppliers, quite the opposite. I pay around two thousand a month, which I think is reasonable. It's just one of the opinions, so don't stone me right away. :-)