Wales Greens
Welsh green party projected to enter the Senedd for the first time with 10 seats in May 2026.
Last refreshed: 26 April 2026 · Appears in 1 active topic
Will the Wales Greens hold the balance of power in the Senedd after the first proportional Welsh election?
Timeline for Wales Greens
Voted ap Iorwerth in on 12 May without written agreement
UK Local Elections 2026: ap Iorwerth's six-power Wales Bill askProvided two votes for ap Iorwerth without a written agreement; excluded from cabinet
UK Local Elections 2026: Plaid takes Cardiff after 27 yearsprovided confidence and supply backing for Plaid minority government
UK Local Elections 2026: Plaid Cymru forms Welsh minority governmentProjected to fall from 10 to 2 Senedd seats in final MRP, losing kingmaker status
UK Local Elections 2026: Wales Greens fall from 10 to 2Projected to fall from 10 to 7 seats, removing the Plaid-Green majority route
UK Local Elections 2026: YouGov second Welsh MRP flips Plaid leadHow many seats are the Wales Greens projected to win in 2026?
Who leads the Wales Green Party?
Who leads the Wales Greens?
Background
Wales Greens (also known as the Welsh Green Party, or Greens Cymru) is the Welsh branch of the Green Party of England and Wales. Before 2026 the party had never held a Senedd seat. YouGov's first Senedd MRP projected the party at 10 seats under the new closed-list proportional system, giving a potential Plaid-Green Coalition 53 seats — four above the 49-seat majority threshold.
The 2026 Senedd election is the first under a proportional representation system: an expanded 96-seat chamber elected by closed-list PR across 16 six-member constituencies. Under the old single-member plurality system, no Welsh Green candidate had ever cleared the threshold. Leader Anthony Slaughter described the party as the 'only Left-wing party in Wales' and said it was 'ready to be kingmakers'. The second YouGov MRP revised the Green projection to 7 seats, reflecting the tightening of the Plaid-Reform contest, but a Plaid-Green Coalition remains arithmetically viable above the majority threshold.
The prospect of a Plaid-Green Coalition triggered public tension: Plaid warned Green votes could 'let Reform in' under the list system, while Plaid's Tessa Marshall called Plaid 'not Left-wing enough' — signalling genuine ideological friction in any Coalition negotiation. Wales Greens entering the Senedd for the first time would represent the most significant reconfiguration of Welsh devolved politics since the National Assembly was established in 1999.