Ofgem has launched an investigation into National Grid Electricity Transmission (NGET) in respect of its activities at an electrical substation in Cumbria.
The Harker electrical substation is located in Rockcliffe, around four miles north of Carlisle.
The energy regulator said the investigation was looking into whether NGET breached rules concerning its maintenance of Harker.
Ofgem stressed that the opening of the investigation does not imply it has made any findings about possible non-compliance by NGET.
A spokesperson for National Grid said: “National Grid Electricity Transmission note Ofgem’s investigation into Harker substation in Cumbria.
“We believe that we have managed this substation in accordance with our statutory obligations and license conditions and will fully cooperate with the investigation in an open and transparent manner.”