On 28 January, Ofgem opened an investigation into the compliance of two transmission companies in relation to the Western High Voltage Direct Current (WHVDC) subsea cable linking Scotland and Wales.
The regulator is to review any non-compliance by National Grid Electricity Transmission and Scottish Power Transmission on the delivery and operation of the WHVDC.
In particular it will consider whether the 2016-17 delivery target for the WHVDC Further Works output was achieved, and whether there have been failures to provide transmission services.
The Western Link began operation in December 2017, but only entered full usage in October 2018 and has since been subject to a number of outages, most recently on 10 January.
Ofgem noted that the opening of the investigation does not imply findings of any non-compliance.