One of the Big Six energy suppliers has said it writes off four times as much "bad debt" every year as the funds it retains from closed customer accounts.
A statement from SSE said it takes "all reasonable steps" to return money to customers and always views "any credit as theirs", adding:
No matter how much time passes, if they come forward and we can identify an outstanding credit, we will return it to them.
We're happy to work with anyone who has legitimate suggestions for how we can find customers more easily and efficiently.
However, the reality is that the bad debt we have had to write off in recent years is about four times the amount of credit that couldn't be returned, so this is not a situation that benefits us.
More top news
Young cancer patient Bradley Lowery stole hearts while on the Wembley pitch with the England squad.
A 30-year-old man has been arrested in Birmingham by officers investigating the Westminster terror attack, the Metropolitan Police said.
US airline United faces outrage after apparently ordering women to change or lose their seats for being not "properly clothed".