OFGEM has launched an investigation into whether Utilita broke rules around charging customers above the permitted level of the price cap for prepayment meter customers between May and September 2019.
The Prepayment Meter Price Cap came into force on 1 April 2017.
The cap is temporary, and applies to prepayment meter customers on a non-fixed deal and without an interoperable smart meter.
Suppliers can price to the level of the cap or below it but cannot charge more.
The opening of this investigation does not imply that the regulator has made any findings about non-compliance by Utilita.