The Green Party nuclear power policy has undergone a significant change after members of the Green Party of England and Wales voted to abandon the party’s longstanding blanket opposition to nuclear energy.
The decision, taken at the party’s Autumn Conference in Brighton, represents a notable change for a political movement that has historically regarded nuclear power as too expensive, too slow to build and burdened by concerns over radioactive waste and safety.
Under the revised policy, nuclear fission can now be considered a low-carbon source of electricity, alongside technologies including hydroelectric, tidal, wave and geothermal power. However, the change should not be interpreted as the Greens suddenly becoming enthusiastic supporters of building nuclear reactors across Britain.
Renewable energy remains firmly at the centre of the party’s plans.
What Has the Green Party Actually Changed?
Previously, Green Party policy explicitly called for phasing out nuclear power.
Its 2024 general election manifesto stated that the party would stop the development of new nuclear power stations and campaign for existing nuclear plants to be phased out. The party argued that nuclear projects were pricier and slower to develop than renewable alternatives and raised concerns about radioactive waste and safety.
The new policy removes this blanket opposition.
Nuclear fission is instead included among technologies that can qualify as low-carbon electricity generation. The party’s updated approach still places offshore wind, onshore wind and rooftop solar at the heart of the future electricity system, but nuclear projects will no longer be automatically rejected simply because they involve nuclear energy.
This creates the possibility for Green-elected representatives to assess individual nuclear projects on their merits.
Why Is This Decision Such a Significant Change?
Opposition to nuclear power has been associated with green politics for decades.
The arguments have traditionally focused on several issues: the cost of constructing nuclear power stations, long development times, radioactive waste, environmental consequences and the potential risks associated with nuclear accidents.
For that reason, removing a blanket commitment to phase out nuclear energy represents more than a minor technical amendment.
It signals a willingness within the party to adopt a more technology-neutral approach to parts of the transition to a low-carbon electricity system.
Green MP and energy and net-zero spokesperson Carla Denyer explained that the change does not mean the party has committed itself to supporting new nuclear power stations.
Instead, she said nuclear can have a role while Britain transitions to an electricity system based primarily on renewable energy. She also argued that extending the operating life of existing nuclear stations can sometimes be a low-carbon option because a substantial part of a plant’s carbon footprint arises during construction.
That distinction is important.
The new position is closer to “consider nuclear where appropriate“ than to “build more nuclear power stations.”
Renewable Energy Still Comes First
Anyone expecting the Green Party to abandon its renewable-energy agenda would be mistaken.
The updated policy says electricity generation should be based primarily on offshore wind, onshore wind and rooftop solar photovoltaics. Nuclear fission is placed among a broader group of low-carbon technologies that can potentially complement those main renewable sources.
This means the party continues to focus heavily on renewable electricity in its overall vision.
The difference is that nuclear power is no longer automatically excluded.
That could become increasingly important as Britain attempts to reduce carbon emissions while also meeting growing electricity demand from electric vehicles, heating, industry and data centres.
What About New Nuclear Power Stations?
This is where the new policy becomes particularly interesting.
Dropping blanket opposition does not mean that Green MPs will automatically support projects such as new large-scale reactors.
The revised approach allows proposals to be considered individually, taking factors such as cost, construction time and environmental impact into account.
Denyer has indicated that she would approach proposals for new nuclear stations carefully while being more open to keeping existing plants operating where the evidence supports doing so.
That leaves plenty of room for disagreement between the Green Party and supporters of an aggressive expansion of nuclear generation.
Large nuclear projects can take many years to plan and construct and require enormous amounts of investment. Greens are therefore likely to continue asking whether the same money could produce greater climate benefits if invested in wind, solar, electricity networks, storage and energy efficiency.
Why Nuclear Power Is Returning to the Energy Debate
The debate around nuclear power has changed significantly in recent years.
Governments are pressured to achieve several objectives simultaneously: cutting greenhouse-gas emissions, maintaining reliable electricity supplies, improving energy security and meeting rising demand.
Nuclear power has one major advantage in this debate: it can generate large quantities of low-carbon electricity regardless of whether the wind is blowing or the sun is shining.
Supporters therefore argue that nuclear can complement renewables by providing dependable generation.
Critics counter that nuclear projects are expensive, slow to construct and leave countries responsible for radioactive waste over very long periods.
Those arguments have not disappeared simply because the Green Party has changed its policy. Instead, the party appears to have decided that nuclear should be judged alongside other technologies rather than rejected automatically.
Public Opinion on Nuclear Energy Remains Complicated
British attitudes towards nuclear power also show why the issue remains politically sensitive.
UK government polling published in 2026 found that 24% of respondents supported the construction of a nuclear power station in their local area, while 35% opposed it.
Among supporters, commonly cited reasons included providing a sustainable source of power, reducing dependence on foreign energy and creating jobs.
Among opponents, safety and security concerns were particularly important, followed by worries about radioactive-waste disposal and effects on local wildlife.
In other words, nuclear power can look attractive as a national energy-security policy while becoming much more controversial when a specific reactor is proposed near people’s homes.
What Could the Policy Shift Mean Politically?
The decision could broaden the Green Party’s appeal among voters who strongly support climate action but believe nuclear energy should form part of Britain’s low-carbon electricity mix.
At the same time, it carries political risks.
Some traditional Green supporters remain strongly opposed to nuclear power, citing safety, waste, cost and environmental concerns. The party will therefore need to explain clearly that removing blanket opposition is different from offering unconditional support for new reactors.
There is another important detail: a policy approved by Green Party members does not necessarily mean the same wording will automatically appear in the party’s manifesto at the next general election.
Nevertheless, the vote changes the starting point for future Green discussions about Britain’s energy system.
Existing Nuclear Plants Could Become the Key Question
One of the most immediate consequences may concern existing nuclear stations rather than new ones.
Extending the life of a functioning reactor can present a very different economic and environmental calculation from constructing an entirely new nuclear power station.
Because much of the infrastructure already exists, keeping a safe plant operational can potentially maintain low-carbon electricity generation without repeating the full construction process.
This appears to be an area where the new Green Party nuclear power policy creates considerably more flexibility.
Rather than demanding that nuclear generation disappear as quickly as possible, Green politicians can now consider whether keeping individual plants operating temporarily could help Britain reduce its reliance on fossil fuels during the transition to renewables.
Conclusion
The decision by the Green Party of England and Wales to drop its longstanding blanket opposition to nuclear power represents a major shift in its energy policy.
This does not mean the Greens have abandoned renewable energy or that the party now supports every proposed nuclear power station.
Wind and solar remain its preferred technologies.
What has changed is the principle that nuclear fission must always be rejected. Nuclear power can now be considered a low-carbon electricity source, with individual projects assessed according to their cost, speed, environmental consequences and wider contribution to the energy system.
That is an important distinction.
As Britain faces the difficult challenge of cutting emissions while maintaining reliable and affordable electricity supplies, the argument is increasingly moving beyond a simple choice between nuclear versus renewables.
The bigger question may be how different low-carbon technologies can work together — and which combination delivers clean, secure and affordable electricity most effectively.
The Green Party nuclear power policy shift suggests that even one of Britain’s most traditionally anti-nuclear political movements is now prepared to reconsider where nuclear energy could fit into that future.
