Customers have been struggling to top up their pay-as-you-go energy meters owing to a fault at British Gas.
Those on prepayment meters have been unable to pay via the supplier’s website and app.
The company – the largest supplier in the UK – has apologised, said the app had now been fixed, and is encouraging those affected to call phone lines to top up.
However, many are reporting long waits on busy phone lines.
Other customers are unable to check accounts owing to the website fault.
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Millions of people in the UK use prepayment meters, such as tenants and some who have missed payments in the past. Many will have an account with British Gas.
They prepay for gas and electricity on a card, which allows an emergency credit of £5 if the money runs out.
Angry customers have described how they have been unable to load payments owing to the IT issues, and have faced long waits when trying an alternative method.
“Couldn’t use the app or the website to try and top up and my gas is nearly depleted,” said one on website Down Detector. “Sort yourselves out. It is winter and people can’t top up their gas! Unacceptable!”
On Twitter, customer Jody Greaves wrote: “Now just managed to top up after British Gas forced me into emergency. Absolute joke! 45 mins on phone.”
A spokesman for Centrica, which owns British Gas, said: “Some of our customers have not been able to access their accounts with us due to maintenance of our systems.
“We apologise to customers for the inconvenience and are working hard today to get our operation back to normal.”
He said that prepayment meter customers could still top up on the phone or via any pay point location, often found in local shops. The app, which had been down, was working again from lunchtime.
A report from energy regulator Ofgem last year suggested that British Gas was one of three suppliers with a much higher proportion of prepayment meters per head than the industry average.
The regulator said meters should be “an absolute last resort” for recovering debt, and suppliers should be putting households onto repayment plans first.