Yesterday 06:07 PM
Climate change is exposing nuclear power’s reliability problem
https://thebulletin.org/2026/09/climate-...st-heading
EXCERPT: One of nuclear energy’s biggest selling points is its claims of reliability. “Nuclear energy is the only large-scale power source that can be tapped in even the most extreme weather conditions, 24 hours a day, 7 days a week,” boasts the American energy company Constellation. “Nuclear power plants are very reliable, and can run for many months without interruption, providing large amounts of clean electricity, regardless of the time of day, the weather, or the season,” says the World Nuclear Association. At a public meeting in June, Keith Ammon, a pro-nuclear Republican member of the New Hampshire House of Representatives, echoed these claims: “Nuclear doesn’t care about the weather,” he said. “It just runs.”
Over the next few months, several countries in Europe had to shut down nuclear plants because of hot weather and drought—proving that nuclear power does, indeed, care about the weather. Coming at a time when demand for electricity was high, these countries were faced with an imminent failure of the electricity grid. Citizens and businesses in Hungary and Romania had to reduce their consumption. Ironically, it was solar power—often critiqued by nuclear boosters as unreliable—that provided additional electricity and staved off shortages in some countries. A further irony is that these heat waves are more likely and more severe because of climate change, which is often advanced as the reason to expand nuclear power in the first place.
European countries heavily dependent on nuclear energy were particularly affected. The near-complete shutdown of Hungary’s Paks at the beginning of August, when output was reduced from around 1960 megawatts to around 225, and complete shutdown of Romania’s Cernavoda power plant on August 13, led to a loss of 40 percent and 20 percent of the respective countries’ electricity generation capacity. Both countries declared a state of energy emergency and asked companies and citizens to reduce energy consumption for 30 days. In France, the electricity regulator RTE recorded on August 12 that more than a third of its nuclear generation capacity was down, as eight reactors were completely shut down, with five operating at reduced levels.
Some have made the case that the amount of time when nuclear reactors are not generating power is quite small and their integrated output over the whole year is not significantly impacted. But this is of little comfort to countries like France or Hungary when they end up losing a large fraction of their electricity generation all at once, especially during a heat wave when the need for electricity is high, and their population’s access to electricity is in peril. (MORE - details)
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The reason some countries continued to maintain nuclear to begin with might be because they lacked sufficient wind/tidal sources and topological slash weather conditions conducive to solar. Obviously the best option (if possible) is to have both nuclear and green energy. If one falls short due to environmental conditions, the other is still available. But the stubborn geographical conditions of some regions may not cooperate for both. Germany, however, had no problem like that. It chose to drop nuclear completely and struggle with the unreliability of alternatives for virtue propaganda reasons. ("Nuclear is evil.")
https://thebulletin.org/2026/09/climate-...st-heading
EXCERPT: One of nuclear energy’s biggest selling points is its claims of reliability. “Nuclear energy is the only large-scale power source that can be tapped in even the most extreme weather conditions, 24 hours a day, 7 days a week,” boasts the American energy company Constellation. “Nuclear power plants are very reliable, and can run for many months without interruption, providing large amounts of clean electricity, regardless of the time of day, the weather, or the season,” says the World Nuclear Association. At a public meeting in June, Keith Ammon, a pro-nuclear Republican member of the New Hampshire House of Representatives, echoed these claims: “Nuclear doesn’t care about the weather,” he said. “It just runs.”
Over the next few months, several countries in Europe had to shut down nuclear plants because of hot weather and drought—proving that nuclear power does, indeed, care about the weather. Coming at a time when demand for electricity was high, these countries were faced with an imminent failure of the electricity grid. Citizens and businesses in Hungary and Romania had to reduce their consumption. Ironically, it was solar power—often critiqued by nuclear boosters as unreliable—that provided additional electricity and staved off shortages in some countries. A further irony is that these heat waves are more likely and more severe because of climate change, which is often advanced as the reason to expand nuclear power in the first place.
European countries heavily dependent on nuclear energy were particularly affected. The near-complete shutdown of Hungary’s Paks at the beginning of August, when output was reduced from around 1960 megawatts to around 225, and complete shutdown of Romania’s Cernavoda power plant on August 13, led to a loss of 40 percent and 20 percent of the respective countries’ electricity generation capacity. Both countries declared a state of energy emergency and asked companies and citizens to reduce energy consumption for 30 days. In France, the electricity regulator RTE recorded on August 12 that more than a third of its nuclear generation capacity was down, as eight reactors were completely shut down, with five operating at reduced levels.
Some have made the case that the amount of time when nuclear reactors are not generating power is quite small and their integrated output over the whole year is not significantly impacted. But this is of little comfort to countries like France or Hungary when they end up losing a large fraction of their electricity generation all at once, especially during a heat wave when the need for electricity is high, and their population’s access to electricity is in peril. (MORE - details)
- - - - - - - - - -
The reason some countries continued to maintain nuclear to begin with might be because they lacked sufficient wind/tidal sources and topological slash weather conditions conducive to solar. Obviously the best option (if possible) is to have both nuclear and green energy. If one falls short due to environmental conditions, the other is still available. But the stubborn geographical conditions of some regions may not cooperate for both. Germany, however, had no problem like that. It chose to drop nuclear completely and struggle with the unreliability of alternatives for virtue propaganda reasons. ("Nuclear is evil.")