Just under 440,000 electricity and gas customers were behind in their bills in December, new figures from the Commission for Regulation of Utilities (CRU) show.
In December, 243,644 domestic electricity customers were in arrears – representing 11 per cent of domestic electricity customers – down from 278,403 in November.
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However, arrears among domestic gas customers showed the opposite monthly trend, rising from 152,966 to 153,161 – 22 per cent of total domestic gas customers.
Among non-domestic customers, 35,290 were in arrears for electricity and 7,013 for gas.
By quarter, the CRU found overall electricity arrears were down significantly at the end of December (278,934) compared to the end of the previous quarter in September (321,270).