Npower has apologised after personal details of around 5,000 customers were accidentally shared with the wrong people.

The big six supplier said in a statement that an issue with its postal mailing for its feed-in tariff (FIT) scheme meant some customers received letters containing other customers’ names, addresses, payment amounts and tariff reference numbers.

It added that it was “urgently investigating” how the mistake occurred with its fulfilment partner who sent the mailing on the supplier’s behalf.

A spokesperson said: “We are aware of an issue with a postal mailing for our feed-in tariff scheme meaning some customers received letters meant for other people.

“The letters included the customer’s name, address, payment amount and FIT reference number. At no point were any bank details disclosed.

“We’re urgently investigating how this occurred with our fulfilment partner (who sent the mailing on our behalf).  We apologise for this error – especially to the customers whose information was incorrectly shared (around 5,000 in total).

“We’ve notified the Information Commissioner’s Office of the incident.”

Meanwhile the Information Commissioner’s Office (ICO) said it was “aware” of the incident.

An ICO spokesperson said: “Npower has made us aware of an incident and we are making enquiries.

“If you think you are at risk of identity theft or fraud, you can contact Action Fraud for advice.”

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