A yw Llywodraeth Cymru yn gwybod beth yw'r costau ar gyfer rhoi llinellau trydan newydd o dan y ddaear, gan ddefnyddio dull aredig cebl, o'i gymharu â'r costau ar gyfer llinellau uwchben/peilonau newydd?
Wedi'i ateb gan Y Gweinidog Newid Hinsawdd | Wedi'i ateb ar 18/09/2023
Welsh Government does not hold costs for all potential options for new electricity connections, which vary significantly in relation to the type of connection and location. We understand National Grid has commissioned an independent assessment of costs of a range of options for cables and lines, which is due to be published soon.