Blaenau Gwent Caerffili Rhymni (Senedd constituency)

Blaenau Gwent Caerffili Rhymni
County multi-member constituency for the Senedd
Boundary of Blaenau Gwent Caerffili Rhymni in Wales
Principal areas	Blaenau Gwent Caerphilly County Borough
Preserved county	Gwent
Major settlements	Abertillery, Bargoed, Caerphilly, Rhymney
Future County multi-member constituency
Created	2026
Seats	6
Created from	UK Parliament boundaries: Blaenau Gwent and Rhymney Caerphilly Previous Senedd constituencies: Blaenau Gwent Caerphilly Merthyr Tydfil and Rhymney Islwyn Previous Senedd region: South Wales East

Blaenau Gwent Caerffili Rhymni ( Welsh for ' Blaenau Gwent , Caerphilly , [and] Rhymney ') is a proposed six-member constituency of the Senedd (Welsh Parliament; Welsh : Senedd Cymru) to be used for the 2026 Senedd election.

It was proposed following the 2026 review of Senedd constituencies, and will be a pairing of the two UK Parliament constituencies of Blaenau Gwent and Rhymney and Caerphilly. It is to have a Welsh-only name.

Boundaries

A Senedd constituency comprising the boundaries of the UK Parliament constituencies of Blaenau Gwent and Rhymney and Caerphilly, has been proposed by the Democracy and Boundary Commission Cymru for the 2026 election to the Senedd (Welsh Parliament; Senedd Cymru). It was initially proposed using the English name Blaenau Gwent, Rhymney and Caerphilly in September 2024, ^[1] but was renamed to Blaenau Gwent Caerffili Rhymni in December proposals with most constituencies using Welsh-only names. ^[2] The Welsh-only name and boundaries were confirmed in the commission's final recommendations in March 2025. ^[3]

It encompasses entirely the principal area (county borough) of Blaenau Gwent and parts of Caerphilly County Borough in South Wales. The constituency is to be established by 2026, following the passing of the Senedd Cymru (Members and Elections) Act 2024. The act legislates electoral reform of the Senedd to create 16 larger "super constituencies", pairing the 32 UK Parliament constituencies in Wales, and using a new fully proportional voting system, with each constituency electing six Members of the Senedd (MSs) rather than one previously. ^[1]

Elections

Elections in the 2020s

Next Senedd election: Blaenau Gwent Caerffili Rhymni

Party		Candidate	Votes	%	±%
Majority
Turnout
Registered electors
	win (new seat)

References

1. Hayward, Will (2 September 2024). "The full details of Wales' 16 new constituencies for Senedd elections". Wales Online. Retrieved 28 February 2025.
2. "Proposed Senedd constituency names divides opinion". ITV News . 17 December 2024.
3. Price, Emily (11 March 2025). "New Senedd 'super constituencies' confirmed". Nation.Cymru. Retrieved 11 March 2025.