I don't think that any of the electricity providers have any minimum period that you need to be away from them before they consider you a new customer when you sign back up with them? I've been a customer of many of the electricity providers on the market and never had any problem returning as a new customer.
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Energy suppliers in Ireland | CRU.ie
This is a list of all energy suppliers licensed by the Commission for Regulation of Utilities (CRU) to supply electricity and gas in the retail energy market in Ireland.
