The Czech plan to build two new reactors at Dukovany has turned into a high-stakes legal and political game. This has put French utility EDF back in the running for a contract it had officially lost to South Korea’s KHNP.
The Czech nuclear restart that caused a lot of trouble
The Czech Republic depends a lot on nuclear power and wants that to stay the same for many years. About a third of its electricity already comes from the Dukovany and Temelín reactors.
The four Dukovany units were built in the 1980s. They still work, but not for long. Prague’s long-term energy strategy is based on building new reactors on the same site.
The Czech government picked Korea Hydro & Nuclear Power (KHNP) to build two new big reactors at Dukovany in 2024. The headline industrial cost was about €8.2 billion per reactor, and KHNP promised to stick to strict schedules and keep costs under control.
The state also came up with a very generous way to pay for things. The state owns most of the project company, EDU II, and the local utility, ČEZ, owns the rest. The government wants to take on almost all of the financial risk.
The model is based on a government-backed loan that pays for all of the construction costs and a 40-year price guarantee for nuclear power.
The total amount of public loans is much bigger than the price of the reactor itself. Brussels thinks that the total will be between €23 billion and €30 billion when interest, fees, risk buffers, and working capital are added up over more than ten years.
How the money works and why Brussels got involved
A state that acts like an all-risk insurance company
Three main pillars support the Czech government’s plan:
- A long-term public loan with a lower interest rate that covers the entire cost of construction.
- A 40-year Contract for Difference (CfD) that sets a fixed price for nuclear power.
- Legal protections against sudden changes in policy, like changes to tax or energy rules.
The CfD says that the state will pay a certain amount for each megawatt-hour of electricity. If the prices in the wholesale market drop below that level, the state pays the plant operator the difference. If prices on the market go up above it, the plant gives the extra money back to the state.
There are already versions of this tool in a number of countries, including the UK for nuclear and renewables. However, the Czech version raises some specific questions.
The European Commission is now looking into the package in more detail as part of a state aid investigation. The nuclear choice itself is not the main focus; it is still a national decision. The main focus is on the size, design, and risk-sharing of the financial support.
Brussels wants to know if the plan makes a risky megaproject into an investment that is almost risk-free for the operator, with taxpayers covering most of the costs.
Worries about competition and “hidden comfort”
The Commission has brought up two groups of worries.
The government worries that this plan could damage competition in electricity markets. A nuclear project with strong government backing might discourage other countries from investing in gas power renewable energy or storage facilities. This concern is particularly relevant for countries that share borders with the Czech electrical grid.
Second, it asks if the CfD provides sufficient incentives to control costs and improve operational efficiency. At the EU level critical details such as the methodology for calculating the precise strike price remain unclear. The possibility of indexation has not been determined. The penalties for project delays have not been adequately specified.
The European Union can provide state aid to nuclear power as long as the support remains strictly limited to essential needs. This assistance must not create unfair advantages for any single company or specific technology in the market. State funding for nuclear energy should follow clear guidelines that prevent distortion of competition. The aid must serve a genuine public interest purpose rather than simply boosting one particular business or technical approach over others. When governments offer financial support to nuclear projects they need to demonstrate that the amount given matches actual requirements. Excessive funding that goes beyond what the project truly needs would violate fair competition principles. The rules also require that state aid does not favor one type of nuclear technology at the expense of alternative solutions. Whether the project involves traditional reactors or newer designs, the support must remain neutral and proportionate. This balanced approach allows European countries to support nuclear energy development while maintaining a level playing field. Companies competing in the nuclear sector should succeed based on their merits rather than preferential government treatment. The framework ensures that public money spent on nuclear power serves broader energy policy goals. These might include reducing carbon emissions, ensuring energy security or maintaining baseload electricity generation capacity. However, any state aid package must include safeguards against market distortion. Regular monitoring and transparency requirements help ensure that the assistance continues to meet its intended purpose without creating unfair competitive dynamics. This policy reflects the understanding that nuclear power can play a role in Europe’s energy mix. At the same time it recognizes that government support must respect competition law & treat all market participants fairly.
EDF lost, but there is still a quiet hope for a comeback.
EDF fought hard to win the Dukovany nuclear project but ultimately failed. The French energy company challenged the decision in Prague courts and lobbied officials in Brussels. When Czech authorities selected KHNP as the winner EDF filed a formal complaint. The French group argued that the Korean bid relied on unrealistic projections about industrial capabilities. EDF also suggested that KHNP might be receiving hidden financial backing from the South Korean government. Despite these efforts the French company was unable to overturn the decision or secure the contract for itself.
The Czech courts rejected the complaints and the contract with KHNP was officially signed in June 2025. On paper it appeared the story had ended. EDF had lost what was called the contract of the century which was valued at approximately 16.4 billion euros for its own proposal.
Two investigations in Brussels have opened a door for EDF to return to negotiations. The company now has a limited opportunity to rejoin the discussions thanks to these inquiries.
# Rewritten Text
The first issue concerns Czech state aid related to how the financing is structured. Major changes by the Commission could significantly alter the economic viability of KHNP’s contract.
The second investigation focuses on EU regulations concerning foreign subsidies. The Commission is examining whether KHNP received assistance from the South Korean government that might have influenced the tender within the EU single market.
There is no automatic right for EDF to win the project, but if the EU finds against the current setup, Prague may have to rethink its choice or change the contract.
KHNP has firmly rejected claims that it received any form of illegal assistance. The company maintains that its proposal complies with all European Union regulations.
A long schedule and changing political situations
The Commission wants to explain that its detailed investigation remains neutral at this stage. It is currently gathering information from Prague along with the companies taking part & interested parties such as competitors NGOs & system operators.
It took about two years to clear the last Czech nuclear state aid case. Officials say that this new investigation, which looks into a larger two-reactor scheme, might take the same amount of time. It seems likely that a final decision will be made around 2027.
The Czech government says that work can continue for now using private and temporary funding. However any final structure must meet future EU requirements. This creates uncertainty for KHNP and its suppliers and the entire supply chain.
Time affects EDF in two different ways. If there is a long delay politicians might lose their enthusiasm for launching another bidding process. However a lengthy wait also increases the pressure on Prague to create a solid project that can withstand legal challenges. This means that if the current competition falls apart the government might find it more attractive to start a fresh competition rather than settle for a flawed outcome.
What the EU is really putting to the test with Dukovany
A model for nuclear support in the future
Dukovany is not just a project for one country. It is a test case for how EU countries can pay for big reactors when there are strict budget rules and a lot of competition from renewable energy.
France Poland & the Netherlands are among the member states that are either planning or considering the construction of new large nuclear units. These countries are closely watching how Brussels handles the Czech case.
| ProblemWhat the Commission looks at: the interest rate, maturity, guarantees, and whether a commercial lender would offer similar terms for a state loan. |
| CfD design: how risk is shared between the state and the operator, how to encourage cost control, and how long the contract will last. |
| Effect on cross-border trade, power markets in neighboring countries, and investment signals for other technologies. |
| Subsidies from other countriesPossible support from outside the EU that may have unfairly lowered KHNP’s bid. |
If the Commission agrees to a generous Czech model, other countries will probably follow suit. If it pushes for stricter conditions, nuclear projects in the future may need utilities to put up more money, offer shorter guarantees, or take on more risk.
The main ideas behind the drama
What a Contract for Difference really means for bills
A Contract for Difference helps make a project’s revenue more predictable. However this arrangement creates secondary effects that touch both consumers & taxpayers. The mechanism works by establishing a guaranteed price floor for energy producers. When market prices fall below this agreed level the government pays the difference to the project operator. When prices rise above it the operator returns money to the government. This back and forth creates a buffer against market volatility. Consumers feel the impact through their energy bills. The costs of these payments get distributed across all electricity users through various surcharges and levies. During periods of low market prices these additional charges increase to cover the shortfall payments made to producers. The effect may not appear as a separate line item but it influences the overall cost structure of energy supply. Taxpayers also bear responsibility for this system. Government agencies must administer these contracts and manage the financial flows between parties. Administrative costs require funding from public resources. Also when market conditions require substantial payments to producers the government must find ways to finance these obligations through general revenue or borrowing. The stability provided to project developers serves a purpose beyond simply protecting their profits. It reduces investment risk and makes financing easier to obtain. Banks and investors show more willingness to fund projects when revenue streams appear reliable. This can accelerate the development of new energy infrastructure that might otherwise struggle to attract capital. The trade-off becomes clear when examining long-term outcomes. Short-term costs to consumers and taxpayers may enable faster deployment of renewable energy capacity. This expanded capacity could eventually lead to lower overall energy costs as technology improves and economies of scale develop. The question centers on whether immediate financial burdens justify potential future benefits. Different countries structure these arrangements in various ways. Some place heavier emphasis on consumer contributions while others rely more on direct government funding. The balance reflects political priorities & economic circumstances specific to each nation.
When market prices drop below a certain level subsidies activate and require funding. The government budget covers these costs through grid tariffs or special consumer taxes. During periods of high prices, the project generates revenue that can reduce tariffs or decrease government expenditure.
Small changes in the strike price or discount rate have big effects on a 40-year nuclear CfD. A strike that is even a few euros per megawatt-hour too high could mean billions of extra support over the life of the contract.
EU officials require thorough modeling and sensitivity analyses with transparent assumptions before they will grant approval.
Risks and possible events in the next few years
There are a number of possible outcomes.
EDF has good reasons to remain patient and keep working in Brussels. The company understands that in European energy politics no deal is truly final until the Commission gives its approval for the funding.