The Written Statement said that this work would be supported by the Welsh Government via an investment package of up to £206m across a ten-year period.
Dywedodd y Datganiad Ysgrifenedig y byddai'r gwaith hwn yn cael ei gefnogi gan Lywodraeth Cymru drwy becyn buddsoddi o hyd at £206m dros gyfnod o ddeng mlynedd.