Thousands of people who bought solar panels have complained to a financial watchdog that they are not bringing them the returns they were promised.
Many people took out loans to pay for panels on the promise they would save thousands of pounds in electricity costs and make money generating power.
They say they have not had the expected savings, and the Financial Services Ombudsman has had 2,000 complaints.
Barclays Bank has put aside £38m to deal with potential claims.
Brian Thompson from Rowlands Gill, Gateshead, told BBC Inside Out he was contacted by a salesman for PV Solar UK but told him he did not want to take a loan on as he was preparing for retirement.
He said he was told the move would provide money towards his pension, which persuaded him, and he took out a loan with Barclays of more than £10,000 over 10 years.
Mr Thompson said the payments he was getting back from the power his solar panels sent to the National Grid did not correspond with what he was told.
“I had to dip into my savings which I was putting away for retirement to pay the loan off. To me it was lies,” he said.
An independent survey of Mr Thompson’s system showed even after 20 years the income from the panels would not cover the cost of the loan.