Gas and electricity regulator Ofgem said it has launched an investigation into SSE’s pre-payment meter (PPM) processes.

The investigation is being launched following concerns about SSE’s approach to switching its customers onto pre-payment meter tariffs, particularly those in potentially vulnerable situations.

The investigation will examine whether SSE breached Ofgem’s Standards of Conduct, which are aimed at ensuring suppliers treat customers fairly.

It will examine whether SSE breached licence conditions which require them to provide appropriate information, and ensure consumers’ ability to pay when suggesting alternative payment methods.

Ofgem added: “The opening of this investigation does not imply that we have made any findings about non-compliance.”

A spokesperson for SSE said: “We are committed to treating all our customers fairly and will be cooperating fully with Ofgem’s investigation into this historic issue.”