Bydd angen i borthladd rhydd yng Nghymru weithredu o fewn fframwaith deddfwriaethol Cymru ar gynaliadwyedd a lles, Deddf Llesiant Cenedlaethau'r Dyfodol (Cymru) 2015, ac ymrwymiadau sero net Llywodraeth Cymru.
A Welsh freeport will need to operate within the Welsh legislative framework on sustainability and wellbeing, The Well-being of Future Generations (Wales) Act 2015, and the Welsh Government’s net zero commitments.