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Following somewhat in Messmer's footsteps, French president Emmanuel Macron announced a plan earlier this month to build at least six new reactors to help the country decarbonize by 2050.

At first glance, theres little life to be found in the nuclear sectors of Frances neighbors. Germanys coalition government is today forging ahead with a publicly popular plan to shutter the countrys remaining nuclear reactors by the end of 2022. The current Belgian government plans to shut down its remaining reactors by 2025. Switzerland is doing the same, albeit with a hazy timetable. Spain plans to start phasing out in 2027. Italy hasnt hosted nuclear power at all since 1990.

France can claim a qualified victory: Under current EU guidelines, at least some nuclear power will be categorized as green.

Some of these antinuclear forces have recently found a sparring ground with France in drafting the EUs sustainable finance taxonomy, which delineates particular energy sources as green. The taxonomy sets incentives for investment in green technologies, instead of setting hard policy, but its an important benchmark.

A lot of investorstheyre not experts in this topic, and theyre trying to understand: Whats really sustainable, and what is greenwashing? says Darragh Conway, a climate policy expert at Climate Focus in Amsterdam. And I think a lot of them will look to official standards that have been adopted, such as the EUs taxonomy.

France, naturally, backed nuclear powers greenness. Scientists from the EU Joint Research Centre agreed, reporting that nuclear power doesnt cause undue environmental harm, despite the need to store nuclear waste.

The report was quickly blasted by ministers from five countries, including Germany and Spain, who argued that including nuclear power in the taxonomy would permanently damage its integrity, credibility and therefore its usefulness.

But the pronuclear side can claim a qualified victory: As of now, at least, some nuclear power is slated to receive the label.

(So, incidentally, will natural gas, which the current German government actually favored.)

This row over green finance obscures an unfortunate reality: Its uncertain how the power once generated by fission will be made up if plants go offline. The obvious answer might be solar and wind. After all, the cost of renewables continues to plummet. But to decarbonize Europes grid in short order, the renewable requirements are already steep, and removing nuclear energy from the picture makes it even harder to match that curve.

Even in the most ambitious scenarios but the most ambitious countries, it is an incredible undertaking to try to deploy that much in terms of renewables to meet the climate goals, says Adam Stein, a nuclear policy expert at the Breakthrough Institute. It's possible for some countries to succeed, he says, but that would likely involve them buying an outsized share of the worlds supply of renewable energy infrastructure, threatening to prevent other countries from reaching their goals.

This reality has come to the forefront as gas prices spiked over Europes past winter. France continued to export its nuclear power as supplies of politically sensitive Russian natural gas ran thinner. Unlike the concrete in reactor shielding, public opinion isnt set, and indications are that rising energy costs are softening attitudes to atoms, at least in Germany.

And other countries are charting new nuclear courses. Poland has begun forging ahead with French-backed plans to build a half dozen nuclear reactors by 2043. In October, Romania adopted a plan to double its nuclear capacity by 2031. Closer to the Atlantic, in December, a new Dutch coalition government stated its ambition to build two new nuclear power plants, declaring them a necessity to meet climate targets that arent falling any further away.

Its entirely possible that the picture might change as solar and wind costs continue to fall and as renewables expand. After all, in sharp contrast to those two, the average price of nuclear electricity had actually nudged upward by 26 percent between 2010 and 2019.

Whether nuclear is more cost effective than renewables, it does differ per country, says Conway. In a lot of countries, nuclear is already more expensive than renewables.

But Stein says that the idea of looking at nuclear as a bottleneck for renewables is flawedwhen the real target should be to reduce reliance on fossil fuels. We need every clean energy source, building as much as they can, as fast as they can. Its not one versus the other, he says.

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