Rhoddodd Deddf Llywodraeth Leol ac Etholiadau (Cymru) 2021 yr opsiwn i brif gynghorau yng Nghymru ddewis rhwng system ‘y cyntaf i’r felin’ a system STV ar gyfer cynnal etholiadau i brif gynghorau. Mae’r un Ddeddf yn ei gwneud yn ofynnol i Weinidogion Cymru sicrhau bod yna reolau ar gyfer cynnal etholiad i brif gyngor gan ddefnyddio system STV.
The Local Government and Elections (Wales) Act 2021 gave principal councils in Wales the option to choose between ‘first past the post’ and STV systems for principal council elections. The same Act requires the Welsh Ministers to ensure there are rules for the conduct of a principal council election using STV.