Almost a quarter (24%) of indebted energy customers are unable to repay their supplier, new research commissioned by National Debtline has found. A nationally representative survey by Opinium found that an estimated 6.4 million UK adults (12%) are behind on their energy bills heading into this winter – an increase of more than 824,000 since April. It comes amid renewed calls for the chancellor to introduce a Help to Repay scheme at the upcoming Autumn Statement.