Good Energy is set to see customer numbers increase after it struck a deal with the Clean Energy Switch, a collective switching process organised by 38 Degrees and Big Deal. The company currently has 55,000 customers. Up to 100,000 have registered their interest in the deal, and more can join the switch up to 28 September. Good Energy said collective switches always draw lots of initial interest, but only a fraction would follow through and switch. It said, “We’re pleased that so many people have shown an interest and hope that a good number of them do switch to Good Energy as part of this campaign by 38 Degrees and The Big Deal.”

The Independent says the new customers will pay £947 a year on average. It says that compares with £1,112 for other Good Energy customers and £1,179 for customers with the big six energy companies.

Clean Energy Switch could see significant numbers switching. But fast-moving customers might have got green electricity more cheaply. Comparison website MoneySavingExpert, which says 150,000 people switched during two earlier collective switches, closed its third offering on 17 September. It offered Green Star Energy’s MSE Green Saver 12 Month Fixed 1509 tariff at an average of £895 a year, albeit with exit fees. Its cheapest tariff is £814 from E.On.

MoneySavingExpert is upfront about the commission from the collective switch. It gains £60 from each dual-fuel switch, of which it promises to return £30 in cash back. It says it retains £11 for each switch.

Meanwhile the Telegraph newspaper is set to run another collective switching process with partner EnergyHelpline. A previous switch in the summer saw 10,000 people offered a new tariff. The new switch will be open between 19 October and 16 November and so far over 9,000 people have registered their interest.

Customers can also sign up for the Big Community Switch, taking registrations until 12 October with deals offered from 23 October. Some 7,500 people have registered.