Comment by croes
4 hours ago
Our problem isn’t energy production, it’s storage.
Nuclear power plants aren’t flexible enough for sudden changes in energy consumption.
4 hours ago
Our problem isn’t energy production, it’s storage.
Nuclear power plants aren’t flexible enough for sudden changes in energy consumption.
Nuclear power is one of the most flexible sources of power, especially PWR's with ALFC or even more so - BWR's You can actually see how France is flexing in the summer on RTE website
France's nuclear operators have been claiming this for years. But recently started claiming that wind and solar are bad because they force nuclear to flex which is too expensive.
> Electricite de France SA said growing solar and wind generation was increasing equipment wear and maintenance costs at its nuclear reactors, which are forced to reduce output when power demand is insufficient.
https://www.bloomberg.com/news/articles/2026-02-16/edf-warns...
"France's nuclear operators have been claiming this for years. But recently started claiming that wind and solar are bad because they force nuclear to flex which is too expensive." - one doesnt disprove the other.
French nuclear is extremely flexible https://www.services-rte.com/en/view-data-published-by-rte/g... but it doesn't mean it's free. Solar and wind without proper bess to support them are creating problems for other generators, acting as grid parasites without offering proper firm generation
The storage problem is home-made, because our problem is intermittent renewables that can't produce on-demand.
With consistent producers like nuclear there is no storage problem.
And of course the Natrium plant has the buffer so it can ramp grid output up and down while maintaining the reactor at consistent power levels.
Nuclear power plants and the electric networks have a big problem when power consumption has sudden big changes, like this
https://www.wsj.com/business/energy-oil/a-new-threat-to-powe...
Storage would mean just to reroute the energy to storage, otherwise you need to lower the power plant‘s output what doesn’t happen fast in nuclear power plants
> With consistent producers like nuclear there is no storage problem.
This tells me you’ve never looked at a demand curve. In for example California the demand swings from 18 GW to 50 GW over the day and seasons.
The problem has always been economical. And this solution is looking like a bandaid to get taxpayer handouts.
Why store expensive nuclear electricity rather than extremely cheap renewable electricity?
France seems to work. They have plenty of nuclear power that is flexible. And you can have other forms of consumption flexibility; otherwise wind and solar are really in trouble.
France is part of the EU power grid and flexibility comes from that not from nuclear power plants. And the government had to rise the subsidies for nuclear energy to prevent higher rises of the energy prices. The costs for the consumers still raised.
And their power plants were in trouble in the last hot summer because the rivers were too hot to be used for cooling. Won‘t be the last time. And that will be a big problem when people turn on their AC in a heat wave but the power plants can’t power up because they don’t have enough cool water.
And that was before drone wars were a thing.
People react nervously when unknown drones fly around airports and power plants.
And didn’t we learn from the internet that centralization is a bad thing? Nuclear power plants are exactly that.
Imagine a grid where every consumer is also a producer who can satisfy their energy needs at least partially for themselves even without the grid. Try to blackout that.
"France is part of the EU power grid and flexibility comes from that not from nuclear power plants." - blatant lie. You can see in generation data they are flexing a lot in the summer. https://www.services-rte.com/en/view-data-published-by-rte/g...
"And their power plants were in trouble in the last hot summer" - blatant lie. Cooling was fine, it's env protection law to avoid damaging the fauna(read - to not boil fish). Yet, it affects about 0.02% of annual generation and valid almost exclusively to NPP without cooling towers. Yet in those exact periods EDF was net exporting about 14GW to neighbors, again, data is public. French nukes can handle ppl's AC's just well, probably EDF even hopes for that to modulate their npp less and get more $
Why people always spread such nonsense without even checking the facts? Like https://www.vie-publique.fr/files/rapport/pdf/288726.pdf
"And didn’t we learn from the internet that centralization is a bad thing? Nuclear power plants are exactly that." France has a combination of centralized and decentralized power - npp's are distributed around the country but each can generate a lot of power. Even more distribution and you start paying a ton for transmission lines and maintenance. That's the reason Germany started subsidizing them from this year, with about 6bn/y. Full decentralization is not a feature and you still can't achieve it since transmission system is centralized, prime example being recent cascade blackout in Spain.
"Imagine a grid where every consumer is also a producer who can satisfy their energy needs at least partially for themselves even without the grid. Try to blackout that." - that'll mean having to need a fully parallel grid for firming. Besides, a lot of home solar are grid followers - if there's a blackout, it'll shut down too unless you have a special invertor+bess which many dont have (yet)
"And that was before drone wars were a thing." - a drone would do nothing to a NPP. Even an airplane impact can be tolerated depending how new is the NPP.
1 reply →
France uses their own and their neighbors fossil capacity to manage nuclear inflexibility.
When a cold spell hits France exports turn to imports.
Now EDF is crying about renewables lowering nuclear earning potential and increasing maintenance costs.
The problem is that they are up against economic incentives. Why should a company or person with solar and storage buy grid based nuclear power? They don’t.
Why should they not sell their excess to their neighbors? They do.
https://www.bloomberg.com/news/articles/2026-02-16/edf-warns...
No it doesn't. You can see it https://www.services-rte.com/en/view-data-published-by-rte/g...
French nuclear is more flexible than coal by design and as flexible as many older gas plants with ALFC system. They can reach up to 0.5%/second modulation (proved by Philipsburg) if the situation requires but it's rarely the case if you have a fleet. It's still not as fast as BWR's that can reach 1%/second but german coal is the slowest load follower and still meets min requirements imposed by the grid.
"When a cold spell hits France exports turn to imports." - was true in the past, a bit, but afaik this and last winter France was net exporting a ton. And with FLA3 reaching full capacity this year it'll be even less of a problem. It's not like they have a problem now, they are the largest net exporter on the continent and it's unlikely to change soon.
"Now EDF is crying about renewables lowering nuclear earning potential and increasing maintenance costs." - yes, because ren generation is acting like a parasitic source without proper BESS deployments - they eat into firm power profits without providing firm power benefits.
"Why should a company or person with solar and storage buy grid based nuclear power? They don’t." - because in many places of the world solar+bess are not sufficient. It's also the reason why Microsoft signed a contract for TMI way above market prices instead of building a fully offgrid ren solution
EDF is selling power to neighbors and makes money from it. It also is modulating it's npp a lot, which will maybe change when AC's will be more widely deployed and EV's will expand. It also is trying to schedule most maintenance works in summer, during lowest demand periods