Reviewing politics
and culture since 1913

  1. Politics
  2. Wales
1 April 2026

Could Wales turn Plaid-Green?

The parties may have little choice but to form a coalition after the May elections

By Megan Kenyon

If the polls are to be believed, Wales is on course for its first non-Labour government in 27 years after the 7 May Senedd elections. The latest YouGov MRP poll puts Plaid Cymru on course to win 43 seats – just six short of the 49 needed for a majority. According to the same poll, the Green Party is projected to make a breakthrough, winning 10 of the 96 seats on offer (the party currently has no members of the Senedd).

Plaid Cymru and the Green Party should, in theory, be natural allies. Both parties sit to the left of the Labour Party and have recently benefited – in by-elections such as Caerphilly and Gorton and Denton – from being the progressive option for protest voters. There is widespread speculation that the two parties could form some sort of coalition or confidence-and-supply arrangement in the next Welsh government.

But after Tuesday’s Green Party campaign launch, relations between the two parties appear to have soured. Speaking in Cardiff alongside the party’s national leader, Zack Polanski, Anthony Slaughter – the leader of the Welsh Greens – described his party as the “only left-wing party in Wales”. Slaughter also said that the Welsh Greens are ready to be “kingmakers” in the Senedd. Tessa Marshall, a Green candidate in Wales, went further, criticising Plaid Cymru and adding: “Plaid are not a left-wing party.”

This prompted criticism from Plaid Cymru figures. Carrie Harper, a Plaid Cymru Senedd candidate, described the comments as “seriously disappointing”. She added: “Voting Green could let in Reform in many seats across Wales.”

Subscribe to the New Statesman today and save 75%

Even so, figures from both parties are privately critical of each other. A Plaid Cymru source warned that it does not help for voters to assume the result on 7 May will be a Plaid-Green coalition.

In preparation for government, Plaid Cymru officials have reportedly been speaking to counterparts in the SNP to learn from their experience of governing in Scotland. This has included lessons from the SNP’s cooperation agreement with the Scottish Greens (a separate party from the Green Party of England and Wales). Though no formal talks between Plaid Cymru and the Greens have taken place, Plaid is treading cautiously.

The Greens appear similarly wary. A Green Party source told the New Statesman that the party would approach any deal with Plaid Cymru with clear red lines. They too have been in contact with Scottish counterparts. The source said: “When the SNP started watering things down, the Scottish Greens walked away from government. It’s not about getting a seat at the table for us – it’s about delivering real change.”

Select and enter your email address Your weekly guide to the best writing on ideas, politics, books and culture every Saturday. The best way to sign up for The Saturday Read is via saturdayread.substack.com The New Statesman's quick and essential guide to the news and politics of the day. The best way to sign up for Morning Call is via morningcall.substack.com
Visit our privacy Policy for more information about our services, how Progressive Media Investments may use, process and share your personal data, including information on your rights in respect of your personal data and how you can unsubscribe from future marketing communications.
THANK YOU

Tension is inevitable when both parties are competing for a similar set of voters. Briefings and counter-briefings are typical in the run-up to an election. But if the polls are correct, then after 7 May, Plaid Cymru and the Welsh Greens may have little choice but to cooperate to form a stable government in Cardiff Bay.

[Further reading: The Greens who want to drill the North Sea]

Content from our partners
In Sunderland, we are building homes and skills with a vision for the future
Accelerating ambition in cancer care
From Copenhagen to Sunderland

Topics in this article : ,
Subscribe
Notify of
0 Comments
Most Voted
Newest Oldest
Inline Feedbacks
View all comments