DNS projects are similar to Nationally Significant Infrastructure Projects (NSIPs), but NSIPs are decided by the UK Government, whereas DNS applications are decided by the Welsh Ministers.
Mae prosiectau DNS yn debyg i Brosiectau Seilwaith o Arwyddocâd Cenedlaethol (NSIPau), ond Llywodraeth y DU sy’n penderfynu ar NSIPau, tra caiff ceisiadau DNS eu penderfynu gan Weinidogion Cymru.