Really the entire goal should be both renewables and nuclear. Nuclear provides a reliable baseline that isn't dependent on weather conditions, is incredibly safe, and will last a long time at the cost of large upfront construction costs. Renewables are great for main power generation and can be used for small scale or large scale power generation and built quickly, but they need the weather to be optimal to generate optimal power. They also need to be mantained and replaced more often, which can be covered by that baseline nuclear provides. Since we don't have advanced enough power storage to use renewables exclusively due to their drawbacks, nuclear would be great for replacing coal and oil power plants to supply it when the renewables aren't able to do all of the work.

I would love to say we can build renewables and nuclear. But let's look at the actual reality: Not only are most countries with a nuclear plan lacking proper amounts of renewables (because for more than a decade an anti-renewable streak was part of nuclear lobbyism - see the amount of people here or anywhere else hallucinating about "expensive renewables" when their own model of electrity generation needs those renewables (and even some storage) to be viable), it's even worse. Most of these countries aren't even able to build nuclear on the proper scale they would need.

So no, there is no technical reason we can't build both.

But real-world experience right now shows us that most can't even get the proper build-up of nuclear alone done. Explaining to their heavily desinformed voters why they need to build massive capacities and also need to build even bigger amounts of renewables seems to be indeed impossible right now.

The other thing is time frame. If the already agreed upon climate goals give you a remaining co2 budget for another 6 or so years, you can indeed not start building nuclear now. That would have been a wonderful idea a decade or even longer ago.

There is actually only one undisputable thing we need to do right now: build up renewables and massively so. To stretch out the remaining budget (via constantly reducing CO2 emission quickly) to 1-2 decades and use that time to a) either build up storage and infrastructure or nuclear base load. The difference is that the infrastructure and storage can be build in steps alongside renewables while the nuclear base load would need to start today. And most countries seem unable to do it, with the deciding factor being costs. Costs they would also mostly need to pay now in advance.

In reality we can't build nuclear at all since we will have no water. Ask the French if you need details...

Yes, nuclear taking too long to build is not argument, it just means we should have started building them already.

If that's your take why is exactly nobody doing it? Oh, yeah. Because nobody has a clue how to actually pay the massive (and mostly paid in advance) costs.

Yet a lot of countries are proudly planning to build nuclear soon™ instead of those silly renewables, when what they actually would need to do is building much more nuclear than they are planning right now while also building massive amounts of renewables.

You are not actually wrong. Building more nuclear right now is an option. Building-up storage and infrastructure instead is the other viable one. Building massive amounts of renewables is needed in both cases.

The moment you show me countries starting nuclear in proper amounts right now, while also building and planning the needed increase in renewables alongside I will cheer for them. (For reference: energy demand increasing by a factor of at least 2,5 with ~35% production capacity needed for a solid base load means your minimal goal for nuclear capacities right now should be ~100% of todays demand...)

But as basically no country seems to be able to manage that investment the only option is storage and infrastructure. Is it costing the same in the end? Maybe? Probably? We don't know actually as decade long predictions for evolving technologies are not that precise (just look at the cost development of solar in the last decade for example). We know however that this is a constant investment over the same time renewables are build up to provide 100% coverage (PS: the actual numbers would be 115% to 125% btw... based on (regional) diversification of renewables and calculating losses through long-term storage).

Again: I'm not against building nuclear (and renewables!) right now, if that's your plan. I am however very much about the bullshit that is going on right now, where it's more important to show how smart you are by building some nuclear capacity (with the math not adding up at all) while laughing about others building renewables and spouting bullshit how it's just a scam to burn fossil fues forever.

Contrary to the popular narrative between building up renewables and storage and building just some nuclear capacities and some token renewables -if at all- it's not the former countries that are running on ideology with no actual real world plan.

As already said above: I totally support France' plan for 14 new reactors build until 2050, with a lot of renewable build-up at the same time. Because that's a workable plan. But that they already have problems publically justifying the bare minimum requirement of 14 reactors and the renewable up-build is a symptom of a larger problem. And basically every other country planning new nuclear power right now isn't even close to this scale and just living in a fairy tale world... or just providing an token effort while hoping for other bigger countries to solve the issue for them in the end.

Yeah, that's one of the most funny things to me in this debate. People are calling of all kind of radical measures to combat climate change, but when it comes to nuclear power somehow "too expensive" is a valid argument.

China is building new nuclear plants, but they are building way more coal plants as well.

https://www.theguardian.com/world/2023/aug/29/china-coal-plants-climate-goals-carbon