Unpopular Opinion
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It's cheap fossil fuels that first pushed nuclear uneconomical, particularly natural gas.
But today, solar is already making those same fossil fuels increasingly uneconomical. If we transferred the >$20bil/yr that current gets sent to the already-massively-profitably fossil fuel companies instead to grid upgrades, storage, and renewable investment, that'd be pretty fucking neat. We're already seeing rapid changes to the energy economy because of the reality of these costs. The trillion+ dollars being almost entirely directed to grid enhancements, under-served communities, and renewable energy that is the IRA is causing massive, sweeping changes to the world of energy too. Even if people on forums like these have decided they want to throw out that bill's swimming pool of babies just because one West Virginian took a dry dump in the corner in exchange for getting it passed.
The whole "very different type of power" thing I don't really buy. It is not a profound, cutting observation that the sun isn't always shining. The duck curve barely even exists when you have a good mix of wind and solar for most of the world since these sources are basically fully-complementary, and we already have lots of short and medium-term energy storage technologies that can be run for profit because of how cheap solar is. The market is already creating these incentives and businesses are moving in to fill the need; the technology exists or else isn't that hard to figure out. Overbuilding solar to the point of negative energy prices at peak production (& thus curtailment) will create huge incentives for storage. We're already seeing this; a handful of very serious industrial heat battery firms, for example, are offering products that take advantage of these energy price fluctuations that can be build and run profitably both for them and the firms that buy them. Markets are not a solution for all problems, but they are super goddamn good at wiping out arbitrage.
I've seen no evidence of Germany seriously considering spinning back up their reactors. If you have a source from within the last few months implying different, I'd love to read it, but as of last fall their energy ministry was completely dismissing these ideas as baseless rumors. I'd personally prefer it if they did, though; with the things already built, a lot of the cost is already sunk, and beyond that it seems worthwhile to get coal decommissioned.
France is a more complicated story, but it's impossible to deny they have a lot of successful nuclear capacity. But guess what they're pursing as their key generation platform for the future? It's solar. Because it's way fucking cheaper. Easier for them than most thanks to their massive nuclear base, no doubt.
A lot of this dives deep into wishful thinking territory. We will need to spend trillions of dollars to make a pure renewable energy solution viable. People will find out that nuclear is not magically guaranteed to be more expensive. If it wasn't the case, why are new nuclear reactors still being built and more are being planned?
Germany is definitely rethinking it's anti-nuclear position. Ignore the viewpoints of the current political group in charge. They are deeply unpopular. Politicians outside of that group are advocating for a return to nuclear.
France is keeping and building more reactors. This is not a "more complicated story." It is simple proof that nuclear is viable.
Why is my view of the state of industry with concrete, affordable renewable energy technologies that are already available for purchase and rapidly scaling up just by market forces wishful? Why isn't your belief that nuclear will suddenly buck it's 50+ year trend of always being extremely expensive at least as wishful?
Not all production needs to be economic, mind you. It's fine for the state to pursue an expensive technology because it has some other benefit, and there are concrete benefits of nuclear -- specifically how firm it is, to the point where it's basically irresponsible to ever curtail it or adjust production based on grid demand. But capital isn't infinite and these tradeoffs need to be considered very seriously. On the flip side, spend five minutes searching for what the Georgia PSC has to say about the two new AP1000s at Vogtle. They are not happy at all about the cost overruns and failures. Would the next reactor cost less? Probably... so long as it starts construction soon before those couple thousand of newly-trained workers all find new jobs and progress is lost, as usually happens. But it won't, because no one wants to feel like the next sucker.
I'm totally pragmatic about this. It nuclear stops being ludicrously expensive, we definitely ought to pursue it. And if a new technology shows actual evidence and promise of making it more affordable, it's worth the R&D. But at least so far, it shows no signs of doing so. It's definitely not going to keep following the nearly Moore's Law-like learning curve solar has been on. The french are uniquely good at building reactors because of their long history and even still they are clearly signaling in e.g., their NECP plan that renewables are the primary technology of their future. They're pretty much the best in the world at it and they're still plainly chasing solar because of its affordability.
Nuclear is really just metal in a big water tank. The cost comes from trying to maximize safety. It can be cheap if we mass produce it. People are pretty much engaging in special pleading every time they declare nuclear to be uneconomical.
If you really believe that, then you'd support nuclear power. It is extremely safe these days and is a much better option than to deal with more climate change. You want more options, not less options, in this fight.