Investment Risk Is Highest for Nuclear Power Plants, Lowest for Solar
149 comments
·May 31, 2025rich_sasha
pydry
>or base load power plant, like nuclear, will continue to have marketable "goods".
Nuclear hasnt been marketable for a long time without massive indirect and direct subsidies.
The reason it gets built in spite of its demand for lavish subsidies is because it shares a supply chain and skills base with the military industrial complex.
Countries that have a nuclear military want to share some of the costs with the civilian sector although they typically arent up front about it, preferring to declare that it's because they're environmentalists.
NPT signatories that dont have nuclear weapons but take a strong interest in building civilian nuclear power typically see some sort of potential existential risk on the horizon. Again, officially it's because theyre green hippies.
In unrelated news, after decades of being by far the most coal addicted country in Europe: https://apnews.com/article/poland-us-nuclear-energy-power-pl...
rich_sasha
My point is that immediate profitability (eg nuclear being expensive) is not the right metric. It matters and it's a part of the equation, but overall, it's a bit meaningless to say solar is more profitable to a capital investor than eg nuclear, therefore let's base a country's grid on solar power alone.
Your link to Poland is one of my key counterexamples to a full renewables grid. Northern Europe absolutely sees long periods with little sunshine and wind, and that's also when its energy requirements are highest (winter heating). Much of it is flat, too, and seasonal battery storage exists nowhere right now.
So... If not solar or wind or hydro, and want it to be low-CO2, then you're short on options. So exorcising nuclear seems a bad idea.
pydry
I indirectly an anticipated a comment like yours when I wrote https://news.ycombinator.com/item?id=44143833
Intermittency is not "solved" with nuclear power. When French nuclear plants get shut down for months at a time for maintenance what happens? Lots and lots and lots of peaker gas.
When you combine the extreme cost, the non negligible risks of it going boom and the fact its a horrible peaker (no substitute for gas), and its only slightly lower reliance on peakers it becomes apparent that it's a terrible deal.
The reason why batteries and pumped storage and syngas arent popular is because they cant beat the economics of gas for peaking capacity. However, they can easily beat the economics of nuclear power+gas when combined with solar and wind.
So yeah, exorcising nuclear seems like a pretty fantastic idea, for cost, environmental and pacifist reasons.
fuzzfactor
Roger.
Can't access the article without some other browser, however keep in mind that business risk is in essence a completely different factor than potential return on investment, or what turns out to be actual return. Three fundamentally different things each composed of way different variables.
Regardless, they go hand-in-hand when investment is involved, the attitude at one extreme is to avoid risk as much as possible, while the other extreme will tolerate or even seek out the riskiest of ventures when they feel they will have good fortune in pursuit of unpredictably better returns which sometimes can not be achieved any other way.
One thing that influences relative cost that doesn't seem to be well-represented by those using equations, is what is the source of the energy to begin with?
It's too obvious.
In one respect, nuclear and solar are at the same end of the spectrum where the "fuel" is so long-lasting that it virtually drops out of the equations compared to so many other things.
But virtually zero may not be close enough to true zero when you consider the cost of the fuel itself plus costs to get that fuel ready for harvesting the energy it has to offer.
Once everything else is in place except for actually getting the fuel into a state of readiness from how it is found in nature, few other options compare to the zero cost that solar, wind and a few others will always have in their equations. This number for solar will never go up regardless of scale, and fuel is such a major consideration it is completely tied to production as strongly as anything can be.
IIRC, zero is quite a number.
In a simplified way there are a lot of businesses that don't actually make money until after the initial capital expenditure has been recovered, a point of zero debt is achieved, and until another capital expenditure occurs, performance results from profits in excess of ongoing expenses.
Surely the most convincing financial structures would be dependent on the most dis-similar accounting tactics, since diverse fuel sources can be nothing like each other even though they will always be tied to production, so it must not become possible to do anything but compare apples to oranges :\
JohnCClarke
The book "How big things get done" [1] has tables listing the historical cost overruns of construction projects.
It's worth keeping in mind that solar and wind farms start generating revenue as soon as the first panel or turbine is connected. This make financing much easier and derisks the whole project. Nuclear has to wait the whole ~10 years for the entire station to be finished before the investors get anything back.
energy123
Social licensing risk is a big one that gets swept under the rug. While both solar and nuclear has to face off NIMBYs, once those NIMBYs are defeated then the solar project is in the clear basically forever. But nuclear has no such assurances that there won't be an irrational fear-based anti-nuclear craze like what happened in Germany which leads to early plant closures.
metalman
irrational eh?, three mile Island, Chernoble, Fukeshema, litteral mountains of the most toxic and poisionous waste generated by all of the operational nukes, spead out, semi abandoned everywhere, go ahead
rationalise it then
energy123
Well let's highlight one flaw in what you're saying which is the attempt to rhetorically package up Chernobyl with safer modern plants. Zero people are advocating for a Chernobyl replica to be built in 2025.
helsinkiandrew
One of the reasons for this is that every new nuclear power plant is a little bit different from all the previous ones - 'better', safer, more efficient etc., but different with more risk and expense.
A Solar plant is (very crudely) just purchasing panels from a factory that's already produced millions of them and installing them in a frame so they're pointing at the sun.
rich_sasha
I suppose, as a nuclear fan, if someone messes up solar panels really badly, the societal impact is low. If you mess up a nuclear power plant, it's pretty bad.
UltraSane
Not really, but each new reactor is treated like a completely new design which makes regulations incredibly expensive. It is actually very stupid.
chongli
Small, modular reactors [1] have been the dream of nuclear energy for a long time. The technology was proven a long time ago with nuclear submarines which have an outstanding safety track record. What’s stopping them from entering full scale production is a horrible mix of regulatory red tape and political opposition. Chief among the issues is a regulatory framework which is not designed to certify mass-produced reactors.
No one wants to invest the capital to get a manufacturing plant up and running if regulators aren’t willing to allow completed reactors to be commissioned and begin producing energy at a rate that matches the manufacturing rate. The insistence on treating every nuclear site as a unique project subject to years of environmental surveys and extensive, bespoke planning makes modular reactor designs moot as a technology. This is why every reactor gets a new design: they have to go through the process anyway so they might as well try to max out the production they can achieve at that site.
gghhzzgghhzz
I have yet to see good argument as to why the reactors on nuclear subs are "proof" of the viability of domestic commercial electrical reactors. They have different commercial viability, enriched fuel and safety requirements. Plus I don't think the primary use of reactors on subs is to generate electricity.
Not dismissing SMR for commercial use, but don't see how military subs / ships are relevant
grumpy-de-sre
Unlike SMR's the efficiency/economics of solar are not as dependent on scale. Even small solar installs can be productive.
happymellon
Isn't this the promise of SMRs?
They unfortunately haven't held that promise up.
throw0101d
> Not really, but each new reactor is treated like a completely new design which makes regulations incredibly expensive.
There are already-approved designs that are pre-approved can can be constructed without review:
* https://www.nrc.gov/reactors/new-reactors/large-lwr/design-c...
AIUI, one can get approval from the NRC (under Part 52?) by building a plant as-drawn with a pre-approved design:
* https://en.wikipedia.org/wiki/Combined_Construction_and_Oper...
* https://www.nrc.gov/reading-rm/doc-collections/cfr/part052/f...
If you deviate from the plan then you have to get approval for that deviation. Apparently this was part of the problem with Vogtle (Unit 3): they had a design and got it approved, but because the hands-on knowledge of building had atrophied, they found complications in construction in the drawings, and wanted to make change to simplify things. These changes then had to be approved, which add to delays.
There is another regulatory process where you get approval in phases, and this would have been better for Vogtle. The Decouple podcast has a four-part series on Vogtle that goes into a lot of detail about Vogtle:
* https://www.youtube.com/playlist?list=PLyouH0mkPJXHR0hKW_iLk...
One can get an initial site license without actually picking a particular design, so the process can start with decisions are being made:
* https://wyoleg.gov/InterimCommittee/2023/09-2023071715-03Nuc...
sMarsIntruder
Stupid the regulations or the design process?
null
UltraSane
Treating every reactor like it is a brand new design is very stupid, clearly.
gosolar1
The article equated "investment risk" to cost overruns, not ROI. It's like a forgone conclusion. If you have to build something, you have to pay construction costs and those can vary. If you can buy most of the stuff you need on Amazon (ok, supplier X), you can predict the cost better.
If you look at ROI, which looks at the demand side risk as well (perhaps transient demand, need for quick build out), and assume utilities are in the business of profit maximization, natural gas wins.
earthnail
This is why carbon tax is so important. The moment you tax carbon emissions, natural gas no longer wins.
Assessing the right amount of tax is non-trivial, but approximations for the costs of carbon emissions exist, and even conservative estimates push natural gas out of the profitability zone.
KaiserPro
> natural gas no longer wins.
Well kinda compared to nuclear yes, but compared to coal/oil/incinerator it wins still.
delusional
> Assessing the right amount of tax is non-trivia
I disagree. The "right amount" is pretty trivial. Structuring it such that it's politically favorable, precise, and robust is the actual issue.
There's a general tension between precision and robustness in law, and finding that tradeoff is often the difficult part once public opinion is secured.
pfdietz
The right amount is the amount that drives net emissions to zero.
JumpCrisscross
> right amount is the amount that drives net emissions to zero
On what timeframe? Put it too soon and you risk social upheaval crashing the whole project. Put it too late and you cause unnecessary damage to the climate.
djrj477dhsnv
That's debatable. I haven't looked at the numbers, but surely there's some amount of net co2 emissions that doesn't have a significant impact on the climate.
pydry
The relative cheapness (as opposed to feasibility) of storage tech vs natgas is the main reason why storage tech hasnt really taken off.
Natural gas is just too cheap as a battery (i.e. peaking).
Nuclear power, batteries and pumped storage all require subsidies to be cost competitive and while nuclear power has a powerful champion in the military industrial complex to offset its ridiculous expense, storage tech has no such champion.
matthewdgreen
Storage tech has China, which is massively installing it and promoting it for export. I think you’re focused on the US, but in terms of new energy construction the US is like a small rural province.
JackSlateur
"By contrast, solar energy and electricity grid transmission projects have the best construction track record and are often completed ahead of schedule or below expected cost"
"For Sovacool, the evidence is clear: “Low-carbon sources of energy such as wind and solar not only have huge climatic and energy security benefits, but also financial advantages related to less construction risk and less chance of delays,” he says"
Of course, when you compare electric transportation with nuclear plant, the results are not the same ..
This paper is green washing;
fuzzy2
No need to green-wash what is already green. You could label it "hippie propaganda" or something the like though.
I think TFA just reiterates that we can no longer build complex stuff within a reasonable timeframe and budget. Nuclear reactors just happen to be super complex. Nothing nefarious going on.
blablabla123
Yeah I mean Solar itself seems to be generally considered low tech by now.
Also the failure modes of Nuclear involve some sort of "real time response". In a classic reactor when the power goes off unexpectedly, one needs to make sure that it receives cooling to not risk a meltdown.
The only open problem is storage but I guess there are also reasonably low complexity options like hydrogen or water pumps.
joshuaissac
> when you compare electric transportation with nuclear plant
The article does not have anything about transportation.
JackSlateur
Electric grid transmission, as known as electric power transmission, are things related to the transportation of electricity
ImPostingOnHN
> Of course, when you compare electric transportation with nuclear plant, the results are not the same
You're comparing a nuclear plant to e.g. an electric car? Why? Aren't we comparing power generation methods?
JackSlateur
Transportation of electricity, not transportation of things
The article spoke of the grid;
ImPostingOnHN
The article spoke of it like so:
> By contrast, solar energy and electricity grid transmission projects have the best construction track record and are often completed ahead of schedule or below expected cost
That doesn't seem to comport with your post, so maybe you can elaborate? Intuitively, a redundant, resilient, distributed grid is far better than a centralized one. For an example of why, see how usa's texas has fared in adverse conditions [0]
orson2077
For anyone interested in the economics of fission reactors, Illinois Energy Prof did a GREAT video a while back: https://youtu.be/cbeJIwF1pVY?feature=shared
eqvinox
For context, nuclear and peaker natural gas are the two most expensive sources of electricity in overall lifetime cost per energy output nowadays. It's not clear what exactly he's comparing there on the natural gas side.
Also, his data is from 2013.
cf. https://en.wikipedia.org/wiki/Levelized_cost_of_electricity
(warning: the graph on that wikipedia page has a really poorly cut Y-axis.)
earthnail
LCOE assumes that electricity generation is comparable. However, renewables have a high variability, which puts a much higher load on the grid.
The grid investments are sizeable. You not only need to add a lot of batteries, you also have to make other investments, for example to add moment to the grid, because unlike big turbines like nuclear, water or gas, solar or small wind turbines have almost no moment of inertia, which was one of the problems behind Spain's power outage.
This isn't new stuff, it's all solvable and countries already do this; the power outage of Spain would've been impossible in Germany for example. It's just important to highlight that with old-school power plants, you don't need a lot of that stuff to stabilise the grid. You need to include the grid costs when calculating the true LCOE, which most of these charts, including the Wikipedia one, don't do. Wikipedia isn't lying about that; they outline this very fact as one of the key weaknesses of the LCOE metric.
ZeroGravitas
When grids set up markets to let people compete to provide those grid balancing services batteries totally dominate. Which suggests that is just another area that modern renewables win and reduce costs.
On the other hand Nuclear LCOE generally assume they can sell a high proportion of their power for the next 40 years.
So really the big hidden assumption is that solar won't eat half their market in that timeframe. And then solar plus batteries eats into it further. Which would drive up their cost, letting solar plus batteries win more business in a vicious cycle.
With the recent Iberian power situation half their nuclear was offline because they were already in a huff because they weren't being paid enough money.
Calwestjobs
99.9999% of people do not understand that point about inertia, you are one of them. and no it was not problem with spain, problem with spain was badly selected and configured inverters. if someone says otherwise he is liar.
" with old-school power plants, you don't need a lot of that stuff to stabilise the grid."
you just need proper sizing of renewables inverters + firmware update...... so no you do not need to have inertia of huge mass in turbines. also 99.999999999999999999999999999999999999999999999999999999% of all problems stem of peoples need to regulate grid to flat line for nonsensical reasons, IF you have slight artificially made "fluctuations in grid" which are generated by all inverter synchronized and planned ahead, there is no problem. grid has to have "pulse". THAT is decentralized / new grid. what you are describing is Stanley/Westinghouse grid. so mixing is resulting in nonsense.
pfdietz
> Also, his data is from 2013.
I see this sort of thing so much. Renewable and storage costs have changed so fast that using numbers from even a few years ago gives misleading results. Going back 12 years you might as well be using numbers from another world.
Calwestjobs
but LCOE is price only for WATTS, not for watts at specified time!!! you need watts at night too. so be careful about that, this mistake can make shareholders loose interest in your point...
but yes, LCOE of PV+12hour battery was lower then nuclear, even before 2020/2019 saga...
energy123
Nuclear is still more expensive even when you account for the cost of storage and transmission. So your point is a good one but it doesn't alter the conclusion.
msgodel
Off grid solar is really amazing. I lived on a boat for a year with a homebrew solar set up and have another one on the land I bought last year.
Nuclear makes sense for grid power, solar makes sense for distributed/point power.
IshKebab
What about the winter? I have solar on my house in the UK and it generates enough power to be off-grid from about March to October, but November - February it would be impossible. There are way too many cloudy days. There was a whole week in February where it didn't generate more than 2 kWh on any day.
At more equatorial latitudes you could definitely rely on it more. And it's not really an issue for grid solar yet because we're far from the point where there's more solar power than we need, even in the middle of summer. But eventually winter will be an issue.
msgodel
Yeah up north like that winter is hard and I'd imagine it wouldn't work well. It's a little funny to hear places like Canada and the UK talking about solar. Even here (I'm at the same latitude as Syria) you have to avoid some things in the winter to keep everything on line.
Having to ration power like that is part of the reason I don't think grid solar makes sense anywhere. To get the behavior you need You'd have expose consumers to the fluctuating prices and most people find that extremely unpleasant (many probably more than just maintaining their own array and infrastructure.)
KaiserPro
> What about the winter?
London here, energy independent march-october, with peak grid dependecy in january of about 50ish percent.
If I doubled the array from 5 to 10 kwhr, I _probably_ could remain independent most of the year.
IshKebab
I have 6.5 kW peak. Even at 10 kW sometimes you'll only generate 2 kWh per day, so unless you have extremely low needs (in which case why do you have 10 kW of solar panels?) you can't.
bergie
On a boat one option is to follow the sun. We make 100% of our electrical consumption from solar, though we are considering to add a small wind turbine to the mix.
msgodel
Unfortunately I can't think of a place to put the turbine that wouldn't make the boat unusable for sailing. It's no big deal now that I only use it for recreation again so even if I'm way over budget I won't notice except on long trips.
I have bought one for land and am planning on setting up a separate system with it.
IshKebab
No that doesn't help. The problem with winter isn't really that there isn't enough sun, it's that there are too many cloudy days. For example in January there were like 10 sunny days when I generated about 20 kWh (plenty) but also 12 cloudy days when I generated under 2 kWh (not remotely enough).
If it was sunny all winter I could easily go off-grid.
rhdunn
In Wales I've seen things like speed warning signs have a combined small solar panel and wind turbine -- I'm assuming they also have a small battery as well. This makes sense as it is expensive running power to remote areas, whereas these are self-contained.
oezi
> The researchers compiled data on 662 energy infrastructure projects covering a diverse spectrum of technology classes and capacities, built between 1936 and 2024 across 83 countries, representing $1.358 trillion in investment.
This is quite a lot if we consider that net zero expenditures until 2050 only are expected to amount to 100 trillion.
World GDP was 105 trillion USD in 2024.
Calwestjobs
GDP is PER year metric. so world generates 105T every year...
so you're saying that 4% of gdp every year until 2050... it is peanuts.
so for example if every household ! ! ! !ONLY IN USA ! ! ! lives in passive house, that alone will save more on utility bills, insurance, then your net zero expenditure requires to add. so im not sure if that net zero expenditure is world wide or just USAs, but USA can pay it by themselves, if they were not scammed by building bad buildings for last 20 years.... just for comparison.
also previous powerplants price has to be converted to today's dollars, and inflation metric basket is flawed because it does not consist of building materials, which powerplants are build from. but it contains bread, clothing etc.
so 1.358 T is not todays money that means comparation / ratio is better then you/them suggest.
also NET zero expenditures means, less inputs afterwards, i.e. no/less money sent to canada, mexico, venezuela, africa, persian gulf for oil...... so more money for homeland. which most people forget about to even calculate impact of... positive for usa.
so yes we can do this, but every smartass in TV is saying we can not....
JumpCrisscross
> if every household ! ! ! !ONLY IN USA ! ! ! lives in passive house
What’s a passive house?
nkurz
It's the English translation of the German standard for energy efficient buildings "Passivhaus": https://en.wikipedia.org/wiki/Passive_house
okr
germany tried germany failed. people will protest, because it makes them poor. grand ideas will make people poor. because they would have to invest to make their house passive. and its a lot.
but sure, try it out. :)
oezi
Germany spent too much, too early. Prices have come down so much that the economics are completely different now.
amai
What exactly failed in Germany?
Calwestjobs
germany tried what exactly? concept of passive house is universal thing.
most of US lives like caveman burning wood (which is not ecological nor health safe activity) and spreading nonsense about ondemand water heaters.
while there are multiple billionaires who earn insane amounts on "predicting energy market" i.e. scamming residential customers / citizens thru taxes.
it is like insane asylum.
amai
"I’m particularly struck by our findings on the diseconomies of scale, with projects exceeding 1,561 megawatts in capacity demonstrating significantly higher risk of cost escalation,” says Hanee Ryu, second and corresponding author and a visiting researcher at IGS...
What this could mean, Ryu explains, is that smaller, modular renewable projects might not only bring environmental benefits, but also potentially reduce financial risk and offer better budget predictability."
The diseconomy of scale is something I don't read very often. Interesting!
johnea
I agree that smaller is better.
I would take it even further, and say that storage, as well as generation, should be down-scaled as much as possible.
On-building scale generation, and per building storage, being the ultimate embodiment.
This also minimizes large scale distribution infrastructure needs.
Like with other comments regarding why nuclear is still built in spite of its extreme cost and schedule overruns: utilities want the infrastructure to be organized in a way that can only be operated and maintained by large utilities.
We should put our subsidies into individual building storage, and the technology to distribute the energy in that storage onto the local grid. What we're seeing is the exact opposite, very large scale solar and storage projects that are specifically architected to produce profit, not power.
chronid
Isn't this intuitively true?
Building a nuclear power plant incurs in a massive set up stage with a lot of unknowns unknowns and requiring impressive material engineering and QC.
Solar is much more "incremental", you can almost start producing electricity and recouping costs immediately.
But a nuclear reactor is an extremely dense power generator compared to a solar panel plant by orders of magnitude. I'm not really sure why are they compared this way.
martini333
Is anyone surprised by this?
trollied
Building a solar-only grid is hard. People don't realise that it's a huge challenge kepping the whole grid synced at 50/60Hz when there's a large amount of solar being exported, never mind the entire grid.
Havoc
Fast response battery systems largely solve the frequency issue. Unfortunately there is a lot of incentive to put solar on the grid by individual players, while the cost to do the frequency response is collectivized so tends to lag behind what is needed.
Bit surprised countries aren't just legislating this away. For every MW you put on the grid that doesn't have rotational inertia you need to contribute X money to a fund that builds stabilization capacity.
eqvinox
Why would anyone build a solar-only grid?
pydry
Nobody would, but the nuclear and carbon lobbies like to use straw men models - combining things like laptop batteries with solar to "prove that you cant live without them" and these models leak into public discourse.
A fully green energy grid would most cost effectively comprise of:
* Solar (generally strongest when wind is low, ~5x cheaper per kwh than nuclear power)
* Wind (generally strongest when sun is low, ~5x cheaper than nuclear power)
* Large scale interconnected grids to offset intermittency.
* Batteries and pumped storage for short term storage (~90% roundtrip efficiency but expensive to store long term)
* Syngas for seasonal storage (~50% roundtrip efficiency but cheap to store long term).
delusional
My understanding is that this is mostly a technology problem. Current solar does a lot of grid-following. If solar instead did some sort of "grid driving" with an external synchronizer I would expect this to be a fairly solvable problem.
zidel
The term of art you are probably looking for here is grid forming inverter. The ENTSO-E class list on Wikipedia is probably a good starting point for some of the problems that one might want to handle:
https://en.wikipedia.org/wiki/Inverter-based_resource#Grid-f...
mousethatroared
Put a motor-generator pair next the solar or wind farm and the problem of frequency stabilization is largely solved. Adds a big flywheel for more initial mass.
But now you've changed the economics by adding a big, inefficient (0.95*0.95%), and expensive piece of equipment.
rcxdude
You don't need that, though, the problem is entirely solvable through the inverters. Having some batteries also helps. Combined it's much better grid intertia than spinning motors.
Calwestjobs
flywheel nonsense, just add battery.
I think looking at power purely from the perspective of RoI in a highly gamified environment is misleading.
For one, the immediate economic profit does not reflect long term economic utility. There's factors such as availability, sovereignty, security etc. which are not reflected in hourly electricity prices.
Similarly, we don't look at immediate RoI of other key infrastructure investments: roads, hospitals, military. You sort of can of course, but the calculation isn't as simple as immediate economic benefit. You may finance some expensive preventative treatments which aren't strictly necessary (thus "loss making") but which prevent more expensive treatments down the line.
Finally, the environment is, effectively, gamified. Wholesale prices, retail prices, base load, storage... And it's all interacting with each other. A sceptical take would be that solar compete for a relatively fixed-sized pie of power generation (what they can displace from dispatchable power). But if battery storage doesn't become cheap enough, this will get saturated, and more solar will simply compete for the same finite demand, whereas a dispatchable or base load power plant, like nuclear, will continue to have marketable "goods". Maybe. Maybe not. But my point is, immediate RoI of solar tells you nothing about it.
You may of course arrive at the same conclusion with a better metric (I'm not sure) but that's a separate question. I'm saying the metric is flawed instead.