Taiwan Clears First Regulatory Hurdle on Maanshan Nuclear Restart

Taiwan’s nuclear regulator has just cleared the first formal hurdle toward restarting a plant that was legally required to stay closed, a development that would have been politically impossible eighteen months ago.

The Nuclear Safety Commission’s clearance of Taipower’s preliminary restart plan for the Maanshan Nuclear Power Plant marks the first concrete regulatory output from a May 2025 legislative amendment that reversed decades of phase-out policy. For energy investors tracking Asia’s power sector, the question is no longer whether Taiwan will attempt a nuclear revival.

The question is how many regulatory gates remain, how long they will take, and what could derail the timeline entirely. This piece maps the full sequence of hurdles still ahead, explains what the approval actually does and does not authorise, and frames the investment implications against a regional pattern of policy-driven nuclear revivals now playing out across Asia.

What the NSC’s clearance actually authorises, and what it does not

On or around 24 September 2026, Taiwan’s Nuclear Safety Commission (NSC) cleared its review of Taipower’s preliminary restart and licence-renewal plan for Maanshan. Bloomberg reported the decision on 25 September 2026, and the Taipei Times followed on 26 September 2026, citing an NSC statement.

Here is the part investors need to sit with: this is clearance of a preliminary plan, not the issuance of a new operating licence.

Taipower has been unusually direct about the distinction. The state-owned utility stated that even with the restart plan approved, the plant “cannot start generating electricity immediately,” and that only after the review is approved and a new operating licence is issued will the plant be qualified to operate. That is the operator itself telling you not to over-read the milestone.

NucNet’s reporting on the NSC clearance cites the regulator’s own statement confirming that Taipower must complete safety inspections and submit further implementation reports before any licence can be issued, reinforcing the multi-stage distance between the current approval and an operational plant.

The context sharpens the point. Maanshan Unit 1 shut down in July 2024 when its 40-year licence expired; Unit 2 followed in May 2025 for the same reason. Taipower could only reapply because the Legislative Yuan amended the Nuclear Reactor Facilities Regulation Act in May 2025, permitting licence renewals of up to 20 additional years, a maximum operational life of 60 years. Taipower filed its application in March 2026.

The clearance, then, is a gate passed, not a green light received. The remaining regulatory sequence looks like this:

1. Preliminary plan approval
2. Safety inspections and equipment assessments
3. Implementation report submission to the NSC
4. NSC review of the implementation report
5. New operating licence issued
6. Restart authorised

Anyone reading this milestone as operational confirmation is mispricing the regulatory distance that remains.

The compliance roadmap: inspections, Westinghouse, and the 18-to-24-month clock

The work needed to close that distance is already in motion, and its specificity is what makes the timeline credible.

At a Legislative Yuan hearing in March 2026, Minister of Economic Affairs Kung Ming-hsin confirmed that a safety inspection of Maanshan was already under way. Kung estimated the inspection programme would take roughly 18 to 24 months to complete. That is not a symbolic gesture toward safety; it is a multi-year technical workload.

A central component is a third-party check. Kung confirmed the government had signed a contract with Westinghouse to assess the condition of the plant’s generators. Framing matters here: this is a contracted external assessment, not an internal review, which raises the evidentiary bar for what the NSC will accept.

Alongside it, Taipower is running several distinct assessment strands, each subject to NSC on-site verification:

• Generator condition (Westinghouse): contracted third-party evaluation of the plant’s generating equipment.
• Ageing management: self-assessment and management of ageing-related factors across components after 40 years of operation.
• Radiation safety: evaluation of radiation-related concerns as a discrete regulatory item.
• Seismic safety: structural and risk assessment reflecting Taiwan’s earthquake exposure.

Maanshan itself is a two-unit station: two Westinghouse pressurised water reactor (PWR) units of approximately 951 MW gross capacity each, with commercial operation beginning in 1984 and 1985. A PWR is a reactor design that uses pressurised water to transfer heat from the reactor core to steam generators.

For investors, the Westinghouse contract and the multi-strand programme signal that compliance costs and timelines are real. Anyone with exposure to nuclear service providers has a concrete, named engagement to track here.

Seismic and ageing assessments: the checks that can surface new requirements

Seismic reassessment is the strand most likely to generate fresh compliance requirements. Taiwan sits in a high-seismicity region, and post-Fukushima practice means updated probabilistic risk assessments (statistical models estimating the likelihood of seismic damage) can trigger demands for structural reinforcement or safety-system upgrades. If those requirements emerge, they extend the timeline directly.

The policy reversal that made this possible, and why it may not hold

None of this could have happened without a legislative pivot, and that pivot is younger and more fragile than the restart momentum suggests.

The May 2025 amendment to the Nuclear Reactor Facilities Regulation Act replaced the mandatory shutdown-at-40-years framework with an option to extend for up to 20 additional years. That single change reversed the Democratic Progressive Party’s longstanding “nuclear-free homeland” position, a reversal that coverage attributes to energy-security pressure amid power-reliability and import-dependence concerns.

The scope extends beyond Maanshan. Taipower also filed a restart application for Kuosheng in March 2026, while Chinshan was assessed as unfeasible.

Bloomberg has explicitly characterised the NSC’s clearance as reflecting an energy-security decision, with Taiwan’s policy moving away from its earlier nuclear phase-out.

The Diplomat situated the restart within a wider energy crunch in 2026, including Middle East-related fuel-price volatility affecting Taiwan’s heavy reliance on LNG imports. Firm baseload power looks more attractive when import costs swing.

Yet the political foundation is not solid. A referendum on the Maanshan restart in August 2025 won majority support among voters but fell short of the required turnout threshold of one-quarter of eligible voters, meaning it did not formally pass. That result is the single most useful signal of political risk: enough public support to sustain the current policy, not enough mandate to insulate it.

Three durability risks follow directly:

1. Future political turnover reintroducing phase-out policy.
2. A safety event shifting public sentiment against restart.
3. The referendum mechanism remaining available as an opposition tool.

Policy reversibility is a core risk variable for any long-duration nuclear thesis, and Taiwan’s own 18-month history shows how quickly the environment can move in both directions.

Asia’s nuclear revival pattern and where Taiwan fits the investment picture

Taiwan is not acting in isolation, and that is the more important read for capital allocation.

Japan restarted reactors after its post-Fukushima shutdowns under strengthened safety regimes and enhanced regulatory independence, establishing a precedent for managed life-extension in a seismically active economy. South Korea reversed its phase-out plans under the Yoon administration, re-centring nuclear in its energy-security and industrial policy, the most direct parallel to Taiwan’s current direction.

The Northeast Asia nuclear revival that frames Taiwan’s decision is driven by converging pressures including AI infrastructure demand, energy-security realignment, and the demonstrated feasibility of post-Fukushima life-extension under strengthened regulatory regimes.

Japan’s post-Fukushima restart process established the most relevant precedent in the region: that a democratic government can reinstate nuclear operations on extended licences after a full shutdown, provided safety regimes are visibly strengthened and regulatory independence is credibly maintained.

The International Energy Agency (IEA) stresses in its World Energy Outlook framing that clear, durable policy support and predictable regulation are the conditions capital requires for nuclear life-extension, given long asset lives and high upfront costs. The IAEA and World Nuclear Association add that life-extension can be cost-effective for maintaining low-carbon baseload capacity, but only with rigorous ageing management and transparent oversight.

For the reader, the investable categories split into two. Regulated or contracted generation cash flows, available once a plant is operational, and equipment and service providers, where Westinghouse at Maanshan is a concrete, named benchmark for supply-chain exposure.

Nuclear supply chain investment, rather than reactor-design selection, has emerged as the more tractable entry point for capital in revival markets; the Westinghouse engagement at Maanshan is precisely the kind of contracted service exposure this approach identifies as structurally attractive.

The cautions are equally specific:

• Policy reversibility: markets that swing between phase-out and revival carry higher perceived risk.
• Cost opacity: no publicly disclosed capex or operations-and-maintenance projections for the Maanshan restart exist in available reporting.
• Renewables competition: falling costs in renewables and storage can constrain nuclear utilisation even after a revival.
• Seismic exposure: structural risk that can lift both cost and timeline.

The actionable signal is not that a restart is imminent. It is that Taiwan’s legislative and regulatory framework is now aligned for the first time, opening a defined but conditional window to assess nuclear supply-chain exposure across the region.

What 2028 actually means, and the variables that could push it later

The date attached to this story is 2028, and the qualifier attached to that date is doing most of the work.

Minister Kung has consistently framed 2028 as the earliest feasible restart, not a committed schedule. At the March 2026 hearing, he described inspections taking 1.5 to 2 years, an implementation report around the middle of the following year, and reopening “in 2028 at the earliest.” NucNet reported in March 2026 that operations “could resume as early as 2028.” The Diplomat wrote in April 2026 that recommissioning would take “several years,” with reactors expected online in 2028, and Berliner Zeitung on 25 September 2026 repeated 2028 as the earliest, conditional date.

The dependency chain from here to a running plant looks like this:

1. Inspections complete (18-24 months from early 2026)
2. Westinghouse generator assessment complete
3. Implementation report submitted to the NSC
4. NSC review of the implementation report
5. New operating licence issued
6. Restart authorised (2028 at the earliest)

The critical point is buried in step four. Taipower has acknowledged that the NSC’s review duration at each stage is at the regulator’s discretion, the one variable the operator cannot manage or accelerate.

Three points in the process where timelines can slip

Inspection findings could require additional remediation work before sign-off. Seismic assessments could surface new structural requirements that extend the schedule. And NSC review of the implementation report proceeds at the regulator’s pace, not Taipower’s.

Any thesis anchored to a firm 2028 restart is actually anchored to a best-case regulatory scenario. The honest read is a probability distribution with 2028 as the optimistic floor and meaningful slippage risk beyond it. For anyone modelling cash-flow timelines or supply-chain contract windows, that requires a risk-adjusted view rather than a calendar entry.

Nuclear fuel supply chain security is a parallel constraint on any revival timeline: even a plant cleared for restart requires a reliable, non-disrupted enrichment and fuel-fabrication pathway, a consideration that US-led investment programmes in enrichment capacity are beginning to address at scale.

A conditional opportunity in a region re-opening nuclear, carefully

The picture that emerges is coherent. Preliminary clearance is secured as of 24 September 2026. The compliance roadmap is defined and under way. The 2028 restart window is conditional. Policy durability is uncertain. And the regional pattern, Taiwan alongside South Korea’s revival and Japan’s ongoing restarts, is constructive rather than idiosyncratic.

The gap between “framework aligned” and “plant operational” remains wide, but it is trackable. The practical output of this analysis is knowing what to watch:

• NSC decisions at the implementation-report stage.
• Seismic and ageing assessment outcomes.
• Political signals around nuclear policy durability, including any renewed referendum activity.
• Public disclosure of capex and O&M cost projections, currently a genuine due-diligence gap.
• Kuosheng application progress as a parallel data point.

Read against the IEA’s framing, the durability of policy and the predictability of regulation are the conditions that will decide whether this window widens or closes.

This article is for informational purposes only and should not be considered financial advice. Investors should conduct their own research and consult with financial professionals before making investment decisions. Forward-looking statements regarding restart timelines are speculative and subject to change based on regulatory decisions and company performance. Past performance does not guarantee future results.