| A nuclear reactor can load-follow (increase or decrease their output) by up to 5% of their rated capacity per minute in normal operation: https://snetp.eu/wp-content/uploads/2020/05/SNETP-Factsheet-... For power plants, this is glacial. A power grid has to balanced perfectly on a sub-second level. Also, you can only do this down to about 50% of rated capacity. Below that you have to switch it off completely. If you combine this with renewable generation, it all falls apart. A cloud passing over a large PV installation will drop generation much faster than nuclear plants will ever be able to follow (by increasing generation). So if you want to have a substantial share of renewable generation (which, remember, is the cheap stuff), you can't have more than a token nuclear capacity, because you need to invest the money you might want to spend on nuclear on battery and hydro storage. The other aspect is the economics of nuclear itself. Nuclear power plants are the most capital intensive generation capacity you can build. Even when driving them at the maximum of their rated capacity, the have a levelized cost of electricity several times that of PV and Wind per kwh. Requiring routine load following for nuclear would basically guarantee that no one ever builds a nuclear reactor again. There are reasons to build new nuclear, but it's not cheap/reliable power generation. You build it to have access to a nuclear industrial base, as well as the research and professional community to run a military nuclear program. Or you actually succeed in creating a Small Modular Reactor, which might be suitable for niche applications (i.e. power isolated communities in extreme remote locations). Or you are simply fascinated by the technology and want to invest a ton of money on the off chance that it will produce some unforeseen technological breakthrough (though arguably you'd do better with investing in nuclear fusion from my limited understanding of the research). |
But as far as I know this is a non issue since we 've mostly been able to cover this where it props up. Especially since the grid's demand doesn't tend to go 0-100 or the other way around that fast. Even with a significant amount of nuclear there's multiple of those solar farms, wind farms, etc
For the small fluctuations the turbine's governor response can provide frequency stabilization and pressurised water reactors also provide moderate load following.
>The other aspect is the economics of nuclear itself. Nuclear power plants are the most capital intensive generation capacity you can build. Even when driving them at the maximum of their rated capacity, the have a levelized cost of electricity several times that of PV and Wind per kwh.
When I looked at actually honest comparisons this simply isn't true across the board. I mean it doesn't help that the west has built so few recently and managed some exceptional fuckups whilst also making a lightbulb in an unimportant sidebuildings toilet cost a couple dozen grand in a way that might as well be purposefull sabotage of nuclear but much of the world (read mostly china) does relatively fine with their costs and time frame. These comparisons also have a tendency to use absolutely unrealistic storage costs all the same or foresee continued storage costs of methods that are exhausted. (hydro over here) Additionally it's the cheapest solar that often pulls this down but the vast majority in let's say here in Belgium is residential which is a lot lot more costly and less efficient. The solar farms are all way more south so a lot of these american reports don't make much sense in most of europe either.