Electric Ireland has issued an apology to customers who were left without power due to a fault with key pad top-ups.
The energy firm is working to fix the issue as soon as possible.
A spokesperson from the firm said: "Some Electric Ireland keypad customers in Northern Ireland are affected by an error which has capped their meter at a £10 credit limit.
"A small number of customers' electricity supply has been interrupted.
"Customers who purchased a top up between August 30 at 12am to August 31 at 1.23pm may be affected.
"If you have not purchased a top up in this time period, your meter is not affected, please top up as normal.
"We are contacting affected customers directly, reconnecting where necessary and working to resolve the issue as quickly as possible."
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