Was Europe’s Retreat From Nuclear Power a Strategic Mistake?

Ursula von der Leyen recently described Europe’s decision to reduce nuclear energy as a “strategic mistake.” It’s the sort of statement that immediately provokes a reaction. Depending on who you ask, it either sounds like long-overdue realism or like a quiet attempt to rewrite recent history. But it also raises a more interesting question: how did Europe arrive at its current energy strategy in the first place?

For much of the late twentieth century, nuclear power was a central pillar of European electricity production. Around 1990 it supplied roughly a third of the EU’s power. Today the figure is closer to fifteen percent. The decline didn’t happen overnight, of course. It was the result of a long series of political decisions, shaped by public opinion and occasionally by sudden events.

One of the most decisive moments came after the Fukushima nuclear disaster in 2011. In the aftermath, Germany accelerated its already planned nuclear phase-out. Over the following decade the country systematically shut down its reactors, until the final plants went offline in 2023. The move was widely supported domestically at the time, framed as a step toward a cleaner and safer energy future.

Sweden followed a somewhat different path. Several reactors were closed — including the two at the Ringhals Nuclear Power Plant — but the broader policy has since shifted again. Today the country is not talking about eliminating nuclear power so much as building new reactors. If anything, Sweden’s policy trajectory over the past decade shows how quickly energy debates can swing when circumstances change.

Meanwhile, renewable energy has expanded at extraordinary speed. Wind turbines now dot coastlines and agricultural fields across Europe, while solar panels have become almost routine on rooftops. In purely technological terms, the progress has been impressive. Costs have fallen dramatically, and both wind and solar are now among the cheapest forms of new electricity generation.

Yet the success of renewables also reveals an engineering problem that is harder to ignore the further north you go. Solar power, for example, works beautifully in summer. In winter — especially in northern Europe — the output drops sharply. Wind power can compensate at times, but it fluctuates too. The result is an energy system where supply can swing unpredictably, sometimes within hours.

That’s why the discussion eventually turns to storage.

Take California, which has invested heavily in large-scale battery systems to stabilize its grid. The progress there is genuinely impressive; battery capacity has grown quickly over the past few years. But most of those installations still store only a few hours of electricity. That’s enormously helpful for balancing short-term fluctuations, yet it’s not the same as storing power for days or weeks. Seasonal shortages remain an entirely different challenge.

Europe has already had a reminder that electrical systems can behave in unexpected ways when the balance of generation technologies shifts. In 2025, a massive outage struck much of the Iberian Peninsula, affecting both Spain and Portugal. Investigations later concluded that renewable energy itself was not the direct cause. Still, the event highlighted something engineers have been discussing for years: power grids dominated by inverter-based generation behave differently from the traditional systems built around large rotating turbines.

Old-style generators — coal, gas, nuclear — provide what engineers call inertia. Their massive spinning turbines naturally resist sudden changes in frequency and voltage. Solar panels and wind turbines don’t do that in the same way. Instead, stability has to be recreated through software, storage, and new grid technologies. None of that is impossible, but it does make the system more complex.

Another aspect that rarely enters public debate is energy density. A single nuclear plant can produce enormous amounts of electricity from a relatively small site. Wind farms and solar arrays, by contrast, spread their output over much larger areas. That doesn’t make them inferior — land under wind turbines can still be farmed, for example — but it does highlight the sheer scale involved in replacing dense energy sources with more diffuse ones.

At this point the conversation tends to circle back to nuclear power. Not because it’s perfect — it certainly isn’t — but because it solves some of the problems that renewables create. Nuclear plants provide stable, low-carbon electricity regardless of weather or time of day. That reliability is one reason organizations like the International Energy Agency and the Intergovernmental Panel on Climate Change often include nuclear energy in their long-term decarbonization scenarios.

Of course, the nuclear industry itself is trying to reinvent its technology. Concepts like Small Modular Reactors are often mentioned as the next step. One example is the design being developed by NuScale Power, which aims to produce smaller reactors that could be manufactured more like standardized industrial components. If such designs become economically viable, they might lower the barriers to building new plants.

Then there are the more ambitious ideas. So-called Generation IV reactors — particularly fast breeder reactors — could potentially reuse existing nuclear waste as fuel, extracting far more energy from the material that has already been mined. In theory, that could reduce both the volume of waste and the timescale for storage.

Whether these technologies will arrive soon enough to matter is another question entirely.

And hovering somewhere further on the horizon is nuclear fusion. Experiments at facilities like the Lawrence Livermore National Laboratory have achieved remarkable scientific milestones in recent years. Yet fusion has carried the same reputation for decades: it always seems to be about twenty years away.

Which leaves Europe in a curious position. Renewable energy is expanding rapidly and will likely dominate new electricity generation for years to come. Nuclear power, despite its decline, still provides some of the most reliable low-carbon electricity on the grid. Meanwhile electricity demand itself is expected to grow as transportation, heating, and industry become increasingly electrified.

Perhaps the real mistake wasn’t abandoning nuclear power — or embracing renewables — but assuming that the energy transition would have a single technological answer. If anything, the last decade suggests the opposite. Building a stable, low-carbon energy system may depend less on choosing between technologies than on learning how to combine them.