At 19:30 UTC on September 23, Italy's nuclear vote had pulled 582 points and 375 comments on Hacker News in less than two and a half hours. The faster-moving number obscured the slower one. Italy's government now has 12 months to write the rules that could make a nuclear program possible, while the law approved by Parliament authorizes the construction of zero reactors.
The Senate passed the measure 81 to 51, with seven abstentions, after approval in the lower Chamber of Deputies. The Associated Press reported that the coming decrees must address licensing, safety, radioactive waste and criteria for future sites. A reactor proposal would still need to be made, assessed and approved under that system. For anyone reading the vote as a completed return to nuclear power, that distinction changes the story.
Parliament approved rules before any reactor
Italy has spent nearly four decades without producing nuclear electricity. Its four reactors closed after a 1987 referendum held in the wake of the Chernobyl disaster, and voters rejected a new nuclear program again after Fukushima in 2011. The latest law does not reverse those votes by ordering a plant. It creates the legal machinery through which a future government, regulator and developer could attempt one, according to the AP's account of the final vote.
That machinery reaches well beyond a construction permit. When the Cabinet approved the preliminary bill in February 2025, its official summary described rules for the full life of a nuclear facility: experiments, design, authorization, operation, radioactive-waste storage and disposal, and final dismantling. It also proposed evaluating an independent nuclear-safety authority. The final law gives the government 12 months to adopt implementing decrees and provides for an independent regulator, Reuters reported.
The difference between a framework and a build order is more than legal fine print. A framework decides who can apply, what evidence the applicant must produce, who judges it and who pays when a facility closes. Italy's Cabinet said project promoters would need financial and legal guarantees covering construction, operation, dismantling and nuclear risks, including some risks outside their direct control. Those provisions will help determine whether private capital sees a project it can price or an obligation it cannot absorb.
The technology bet is still waiting for its market test
The government has ruled out simply rebuilding Italy's old first- and second-generation fleet. Its 2025 proposal instead named modular and advanced technologies, along with fusion, as possible parts of the country's future energy mix. The Cabinet document also called for old plants to be permanently decommissioned unless a conversion is justified. That leaves small modular reactors, usually shortened to SMRs, at the center of the near-term political pitch.
SMRs appeal to governments because a smaller unit can, in theory, spread capital commitments across stages and rely more heavily on repeatable factory production. Italy's law cannot manufacture that supply chain. The AP noted that Europe still lacks commercially proven SMR projects operating at scale. It cited industry estimates of €3 billion to €6 billion for one 300-megawatt unit, before extra infrastructure and grid costs. That range is wide enough to make financing terms and construction performance as consequential as reactor design.
The government's economic case is ambitious. When the plan was unveiled, it estimated that nuclear power supplying at least 11% of Italy's energy mix could cut decarbonization costs by €17 billion by 2050. The national energy and climate plan allows for the share to reach 22%, according to Reuters. These are planning estimates, not savings secured by Wednesday's vote. They depend on technologies reaching the market, projects being financed and plants entering service at costs close to the assumptions behind the model.
That timing matters because the problems used to justify the program already exist. Prime Minister Giorgia Meloni's government points to electricity demand, industrial decarbonization and exposure to imported energy. It also expects electrified transport, homes, businesses and power-hungry data centers to add demand, the AP reported. New reactors remain years away even under the government's plan. Grid upgrades, storage, efficiency and renewable generation will therefore keep carrying the nearer-term workload while the nuclear rules and any later projects move through approval.
Waste turns a national plan into a local decision
Italy has no permanent national repository for radioactive waste left by its earlier nuclear program. The material remains at temporary facilities around the country, according to the AP. The new framework must handle existing waste while also defining responsibility for material that future reactors would produce. A policy that looks abstract in Parliament becomes specific as soon as a decree identifies suitable land.
The politics are already visible in polling. A June survey cited by the AP found about 55% support for next-generation nuclear plants. A separate June poll reported by Reuters put support for restarting generation at 51%, while a majority opposed a plant near their home. The two figures measure slightly different questions, yet they point in the same direction: a narrow national majority can coexist with much stronger resistance at a proposed site.
Centre-left parties largely opposed the law. Five Star Movement senator Elena Sironi argued that any plants should go first to land already developed, degraded or occupied by decommissioned industry, rather than consume additional land, Reuters reported. The implementing decrees will have to turn that demand into site criteria that can survive technical review and legal challenges driven by community opposition.
Environmental groups have attacked the plan on both cost and democratic grounds. Greenpeace Italy, WWF Italia, Kyoto Club and Legambiente called the legislation an empty container of promises and said it ran against the referendum results, according to the AP. Michele Governatori of the climate and energy think tank ECCO took a narrower position: a regulatory framework is useful, he said, but may expose weak private-investor interest in technology that is either uncompetitive now or not ready.
A nuclear importer tries to become a builder again
Italy's nuclear exit did not remove atomic power from its electricity consumption. The country imports electricity generated at nuclear plants in neighboring states, including France. The AP describes Italy as one of Europe's largest consumers of imported nuclear electricity. The government's argument is that domestic generation could keep more control over supply, prices and industrial planning inside the country.
Building that capacity at home requires institutions Italy has allowed to lapse or never completed. A regulator needs staff able to judge unfamiliar designs. Waste policy needs a repository and a route for selecting it. Grid planners must decide where firm generation would fit alongside renewables, while developers need a revenue model that can support projects with long lead times. The Cabinet's original proposal explicitly called for constant coordination with grid operators and an assessment of the effect on the electricity market.
The law's broad framework lets the government work on all of those fronts, but it also postpones the hardest choices. No vendor won an order on Wednesday, and no financing package showed how construction risk would be divided between the public and investors. What Parliament approved is the process that could force each answer into public view.
The first serious test will arrive before anyone pours concrete. Watch whether the government publishes the implementing decrees within 12 months, gives the regulator real independence, names a workable path for existing waste and sets financial guarantees that a developer will accept without transferring every cost overrun to the public. Vague decrees would leave the 81 to 51 vote as permission to keep studying a return. Enforceable rules plus a credible project would mean Italy has started the much harder job: building one.