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Wales holds first 96-seat PR Senedd election 7 May

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Wales holds its first Senedd election under a new closed-list proportional representation system on 7 May 2026, expanding the chamber from 60 to 96 seats across 16 six-member constituencies allocated by D'Hondt.

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Key takeaway

Wales votes on 7 May under a brand-new 96-seat closed-list PR system that no Welsh voter has used before.

Wales holds its first election to a 96-seat Senedd on 7 May 2026 under a new closed-list proportional representation system. The chamber expands from 60 seats to 96 across 16 six-member constituencies, with seats allocated by the D'Hondt method. Each party publishes a ranked list of up to eight candidates per constituency; voters cast a single vote for a party, not a candidate, and seats are awarded to list positions in order until the constituency's six seats are filled.

The system replaces the previous Additional Member System (AMS) that had been used at every Senedd election since the chamber opened in 1999. The Senedd Research Service estimates a party needs roughly 12 per cent of a constituency vote to win a single seat, the implicit threshold the D'Hondt arithmetic produces across a six-member district. Any party falling below that line in a constituency takes no seat there regardless of its national share.

The change is the largest single Reform to the Welsh electoral system since devolution began. Voters who previously cast a constituency vote and a regional list vote now cast only one, for a party. The identity of the person who reaches Cardiff Bay depends entirely on how each party has ordered its internal list, a decision taken inside party machinery before nominations. The 96-seat expansion is paired with no statutory gender floor, following the withdrawal of the Senedd Cymru (Electoral Candidate Lists) Bill in September 2024, leaving women's representation dependent on internal party list-ordering decisions.

Deep Analysis

In plain English

Until now, Wales has used a mixed system to elect its parliament: you cast two votes — one for a local candidate, one for a regional party. The regional votes were designed to compensate for how lopsided the local results were, making the final result more proportional. From 7 May, Wales switches to a simpler but more purely proportional system: you vote once, for a party. Each party has ranked its candidates in advance in each area. Seats go to list positions in order until all six seats per area are filled. The chamber also grows from 60 to 96 members, because the Senedd needed more capacity to scrutinise a devolved government that has grown significantly in responsibility since 1999. The tradeoff is that voters can no longer vote for individual candidates — only for parties.

Deep Analysis

Root Causes

The switch to closed-list PR was driven primarily by the Senedd's need to expand in size without redrawing constituency boundaries in a way that would create an odd hybrid with Westminster seats. The 60-seat chamber was widely considered too small to run an effective committee system and opposition. Expanding to 96 under AMS would have required either doubling regional list seats or redrawing all constituency lines.

The closed-list D'Hondt model was the path of least structural resistance: it uses the same 16-constituency map as the Westminster seats in Wales, each returning six members, which avoids the boundary complexity. The gender representation cost — removing the AMS mechanism through which Labour had voluntarily balanced its candidate slates — was a known tradeoff that the gender-zipping bill was supposed to mitigate.

What could happen next?

Precedent
If Wales's first closed-list PR election produces a stable and proportional government, it creates a template for future reform proposals for the House of Commons.
Risk
Voter confusion in the first closed-list PR Senedd election could produce higher spoilt ballot rates than normal, particularly in areas with high first-time voter registration.

Source Landscape

This story draws on neutral-leaning sources

Primary parallel: The 1999 Senedd elections used AMS, the same system devised for Holyrood, producing a broadly proportional result that gave Labour a minority government with Liberal Democrat support. The switch to closed-list D'Hondt is the biggest structural break from that original settlement — comparable to Holyrood switching system, which no Scottish government has proposed.

Counter-parallel: The Republic of Ireland uses a version of proportional representation (STV) that, unlike closed-list D'Hondt, preserves voter choice over individual candidates within a party list. Wales chose the simpler closed-list model partly for administrative reasons — fewer ballot papers, clearer count rules — accepting the tradeoff of removing individual candidate preference from the voter.

Sources:Senedd Research Service·Democracy Club

Mentions:Senedd →Senedd Research Service →Wales Governance Centre →Senedd Cymru (Electoral Candidate Lists) Bill →Wales →Cardiff Bay →Prima →Parliament →Welsh Labour →Additional Member System (AMS) →D'Hondt method →

First Reported In

Update #1 · Wales rewrites parliament no voter has used

Senedd Research Service· 7 Apr 2026

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Causes and effects

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Wales holds first 96-seat PR Senedd election 7 May

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Different Perspectives

Welsh Government (Plaid Cymru under Rhun ap Iorwerth)

Plaid's Cardiff minority government relies on Green confidence-and-supply with no written agreement, the same arrangement that collapsed in Scotland in 2023. Green Westminster polling fell from 17% to 15% in two weeks as Greens took governing responsibility; whether that deflation reaches Cardiff is the near-term test for ap Iorwerth's majority.

Reform-run English county councils (Essex, Suffolk, Norfolk)

Essex named a City-trained efficiency lead over a budget where statute has already committed roughly 98% of spend; Suffolk simultaneously issued a pre-action letter against the reorganisation that will dissolve it. Reform-controlled authorities are spending public money on litigation their own sector lawyers expect to fail while their DOGE units face statutory constraints they cannot override.

Scottish Government (SNP under John Swinney)

Swinney rested the 72-55 Holyrood mandate on the combined SNP-Green bloc rather than his own party's 58 seats, seven short of the trigger he named; he has publicly conceded he has no plan if Westminster holds its veto. The constitutional argument is made; the enforcement route does not exist.

UK Government (MHCLG and Downing Street)

MHCLG has until 12 June to respond to Suffolk's pre-action letter and faces three further counties at the same stage; Downing Street rejected Holyrood's Section 30 demand as a spokesperson lobby line rather than a written statement, declining to open formal inter-governmental correspondence. Both decisions compress Reform's two main legal challenges into the same two-week window.

UK Government (Labour)

Westminster framed the youth justice transfer as a culmination of prior work rather than a precedent, refused a Section 30 order before the request arrived, and omitted both the Representation of the People Bill and any Wales Bill from the 13 May King's Speech. Starmer is described as open to a devolved-leaders summit in June.

Reform UK

Essex, Norfolk and Suffolk filed pre-action protocol letters framing their LGR challenge as mandate-consistent, while 22 Reform councillors departed in 14 days at an annualised rate nearly three times the 10 percent projection. Richard Tice defended the Harborne 5 million pound gift as unconditional, with no acknowledgement of Farage's two contradictory accounts on record.