Now, this is exciting - when the Big Six energy companies might start to get scared by consumer power? Which? are running The Big Switch. It is an attempt to marshall large numbers of prospective energy switchers to see if they can negotiate far bigger and better deals from the energy suppliers. To date, they have over 160,000 expressions of interest. There is no obligation to switch but if you are not registered by 31st March you won't be in the loop to get any offers that arise.