Mae Llywodraeth Cymru a phartneriaid y gyd-fenter yn cydweithio hefyd i lunio a chyflwyno cais cynllunio ffurfiol ar gyfer y prosiect. Mae llawer iawn o waith eisoes wedi'i wneud ac mae arolygon o'i effaith ar yr amgylchedd wedi'u comisiynu. Dylai cais cynllunio ffurfiol fod yn barod i'w gyflwyno erbyn dechrau 2020, a bydd yn amodol ar ymgynghori eang â'r gymuned leol a rhanddeiliaid eraill ar y cynigion.
Welsh Government and its JVA partners are also working in partnership to develop and submit a formal planning application for the project. Considerable work has already been undertaken and environmental impact surveys have been commissioned. A formal planning application should be ready for submission by early 2020, subject to wide consulting with the local community and other stakeholders on the proposals.