this post was submitted on 28 Apr 2025
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[–] eestileib@lemmy.blahaj.zone 15 points 6 days ago (2 children)

They've got economist-brain and view everything as a money thing, which is fucked up and a problem.

But negative net demand (the thing "negative cost" is signaling) is a pain in the ass, because you either need to shut off the panels from the grid, find some very high-capacity and high-throughput storage, or blow out your power grid.

Like some hydroelectric dams in Germany get run backwards, pumping water back up behind the wall. I think there are pilot projects to pump air into old mines to build up a pressure buffer. Grid-scale batteries just aren't there yet.

Solar is good for things where the power demand is cumulative and relatively insensitive to variation over time (like, say, salt pond evaporation, but you don't actually need panels for that). It's also good for insolation-sensitive demand (like air conditioning).

Turns out distributed rooftop solar makes more sense given our current grid than big solar farms out in the desert (California built one, it was not a good use of money).

It's not great, but we need to bite the bullet and use fission+reprocessing in a big way for the near future.

[–] BreadstickNinja@lemmy.world 5 points 6 days ago

Agreed. It's framed incorrectly, but the real problem is the "duck curve," the time disparity between peak generation and peak consumption. Pumped hydro, battery storage, electrolysis, and mechanical storage are all options, but each has its own constraints. Ultimately, though, it's an engineering problem with viable solutions. We just need the political will for the investment.

[–] frezik@midwest.social 3 points 6 days ago (1 children)

Distributed rooftop solar is the worst way to use our grid. It's designed to pump a lot of power from a single place to a lot of little places. The opposite doesn't work very well.

The solution is to not focus on solar by itself. Solar/wind/water/storage/long distance transmission need to be balanced with each other. Each has strengths and weaknesses that cover for the strengths and weaknesses of the others.

[–] eestileib@lemmy.blahaj.zone 1 points 6 days ago

Distributed rooftop isn't supposed to be about feeding the larger grid so much as topping off local demand right when it's needed.

I'm kind of eccentric so I got a humongous array; even then at peak production I was running the A/C for 3-4 houses in my cul-de-sac other than my own. Most installations around where I live are like 1/4 of the size I put up and rarely feed much back.

And home-scale batteries are getting cheap enough that excess won't necessarily need to get fed into the grid anyway.

[–] EndlessNightmare@reddthat.com 12 points 6 days ago

We have such a stupid fucking system for running society. We go out of our fucking way to block better options simply because they don't maximize profit. Not even "are actually unprofitable," just that they don't maximize profit.

[–] Formfiller@lemmy.world 5 points 6 days ago

But we can start rejecting late stage capitalism. Unfortunately, that’s not what is happening people are voting for right wing nut jobs who will enforce capitalism through oppression, poverty, mass surveillance and militarized police.

[–] NostraDavid@programming.dev 4 points 6 days ago
[–] Olhonestjim@lemmy.world 2 points 6 days ago* (last edited 3 days ago)

I dream of humans one day building a Dyson swarm around the Sun and becoming a Kardashev type 2 civilization. It's a magnificent dream that we probably must one day accomplish or accept extinction.

But that is one serious problem with it. Unless it's managed democratically, one psycho could gain control over all of it, then yeah, they could literally block out the Sun for anyone who won't pay for sunlight.

[–] Rooskie91@discuss.online 269 points 1 week ago (4 children)

If you're describing nearly free and unlimited electricity as a problem, you may want to reconsider some things.

[–] MartianSands@sh.itjust.works 180 points 1 week ago (15 children)

It's a very capitalist way of thinking about the problem, but what "negative prices" actually means in this case is that the grid is over-energised. That's a genuine engineering issue which would take considerable effort to deal with without exploding transformers or setting fire to power stations

[–] pelespirit@sh.itjust.works 37 points 1 week ago* (last edited 1 week ago) (28 children)

Home owned windmills, solar panels and battery storage solves that.

Edit: Look at this awesome diagram of how it's done for a hybrid setup that's about $400 on Amazon.

PIKASOLA Wind Turbine Generator 12V 400W with a 30A Hybrid Charge Controller. As Solar and Wind Charge Controller which can Add Max 500W Solar Panel for 12V Battery.

[–] partial_accumen@lemmy.world 76 points 1 week ago (21 children)

Home owned windmills are almost a total waste. Its surprising how little electricity they generate especially given how much the cost to buy and install. Some real numbers. A 400w can cost almost $18k to buy and install. A 410w solar solar panel is about $250 + $3k of supporting electronics and parts. And that same $3k can support 10+ more panels. I looked into it myself really wanted it to be worth it for home, but it just isn't. Now utility grade wind? Absolutely worth it. You need absolutely giant windmills with massive towers, but once you have those, you can make a LOT of electricity very cost effectively.

Solar panels worth it? Yes. Absolutely.

Batteries, not quite there yet for most folks. Batteries are really expensive, and don't hold very much electricity $10k-$15k can get you a few hours of light or moderate home use capacity. For folks with really expensive electricity rates or very unreliable power this can be worth it financially, but for most every else. Cheaper chemistry batteries are finally starting to be produced (Sodium Ion), but we're right at the beginning of these and there not really any consumer products for home made from these yet.

[–] JustEnoughDucks@feddit.nl 1 points 6 days ago

Sodium ion batteries are going to be the solution. 18650 packs are already out and perform economically. Since the molecules are so much bigger, energy density is only like 60% of lithium based solutions, but they have a very wide temperature range and are incredibly more inert and safe and density isn't a problem for bulk energy storage.

The hurdle to overcome in inverters dealing with the very wide voltage span and bespoke charging ICs, but definitely possible and within 5 years will probably become a lithium iron phosphate competitor.

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[–] hildegarde@lemmy.blahaj.zone 191 points 1 week ago* (last edited 1 week ago) (24 children)

I see this posted a lot as if this is an issue with capitalism. No, this is what happens when you have to deal with maintaining the power grid using capitalism as a tool.

Power generation needs to match consumption. Always constantly the power grid must be balanced. If you consume more than you can generate, you get a blackout. If you generate more than you use, something catches fire.

Renewables generate power on their own schedule. This is a problem that can be solved with storage. But storage is expensive and takes time to construct.

Negative prices are done to try and balance the load. Its not a problem, its an opportunity. If you want to do something that needs a lot of power, you can make money by consuming energy when more consumption is needed. And if you buy a utility scale battery, you can make money when both charging and discharging it if you schedule it right.

That's not renewables being a problem, that's just what happens when the engineering realities of the power grid come into contact with the economic system that is prevalent for now.

[–] frank@sopuli.xyz 35 points 1 week ago (2 children)

Also, fwiw, you can curtail wind turbines incredibly quickly. They're the quickest moving assets on an electrical grid typically. So you are using them to balance the grid quite often. You can just pitch the blades a bit and they slow or stop. it's not really a tech problem, but a financial one like you said.

I'm not sure much about solar curtailment, other than the fact that they receive curtailment requests and comply quite quickly as well.

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[–] JackbyDev@programming.dev 78 points 1 week ago (23 children)

Ughh, no, negative prices aren't some weird "capitalism" thing. When the grid gets over loaded with too much power it can hurt it. So negative prices means that there is too much power in the system that needs to go somewhere.

There are things you can do like batteries and pump water up a hill then let it be hydroelectric power at night.

[–] PumpkinSkink@lemmy.world 71 points 1 week ago (7 children)

But it doesn't say "it can generate too much energy and damage infrastructure", they said "it can drive the price down". The words they chose aren't, like, an accident waiting for someone to explain post-hoc. Like, absolutely we need storage for exactly the reason you say, but they are directly saying the issue is driving the price down, which is only an issue if your not able to imagine a way to create this infrastructure without profit motive.

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[–] Atlas_@lemmy.world 61 points 1 week ago (9 children)

The answer is batteries. And dismantling capitalism, but batteries first

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[–] HalfSalesman@lemm.ee 61 points 1 week ago (1 children)

Capitalism makes abundance problematic.

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[–] TheTechnician27@lemmy.world 52 points 1 week ago* (last edited 1 week ago) (11 children)

You can read the Technology Review article here discussing why this is problematic beyond a JPEG-artifacted screenshot of a snappy quip from a furry porn Twitter account that may or may not have read the article beyond the caption. We need solar power plants to reach net zero emissions, but even despite their decreasing costs and subsidies offered for them, developers are increasingly declining to build them because solar is so oversaturated at peak hours that it becomes worthless or less than worthless. The amount of energy pumped into the grid and the amount being used need to match to keep the grid at a stable ~60 Hz (or equivalent where you live, e.g. 50 Hz for the PAL region), so at some point you need to literally pay people money to take the electricity you're producing to keep the grid stable or to somehow dump the energy before it makes its way onto the grid.

One of the major ways this problem is being offset is via storage so that the electricity can be distributed at a profit during off-peak production hours. Even if the government were to nationalize energy production and build their own solar farms (god, please), they would still run up against this same problem where it becomes unviable to keep building farms without the storage to accommodate them. At that point it becomes a problem not of profit but of "how much fossil fuel generation can we reduce per unit of currency spent?" and "are these farms redundant to each other?".

This is framed through a capitalist lens, but in reality, it's a pressing issue for solar production even if capitalism is removed from the picture entirely. At some point, solar production has to be in large part decoupled from solar distribution, or solar distribution becomes far too saturated in the middle of the day making putting resources toward its production nearly unviable.

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[–] merdaverse@lemmy.world 49 points 1 week ago (13 children)

It's funny how capitalist apologists in this thread attack the format of a tweet and people not reading the actual article, when they clearly haven't read the original article.

Negative prices are only mentioned in passing, as a very rare phenomenon, while most of it is dedicated to value deflation of energy (mentioned 4 times), aka private sector investors not earning enough profits to justify expanding the grid. Basically a cautionary tale of leaving such a critical component of society up to a privatized market.

[–] Rivalarrival@lemmy.today 2 points 6 days ago

Negative prices are only mentioned in passing, as a very rare phenomenon

Negative prices are occurring more and more frequently. The cause is baseload generation: it can't be dialed back as quickly as solar increases during the day, and it can't be ramped up as fast as solar falls off in the evening. The baseload generators have to stay on line to meet overnight demand. Because they can't be adjusted fast enough to match the demand curve, they have to stay online during the day as well.

The immediate solution is to back down the baseload generators, and rely more on peaker plants, which can match the curve.

The longer term solution is to remove the incentives that drive overnight consumption. Stop incentivizing "off peak" consumption, and instead push large industrial consumers to daytime operation.

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[–] yagurlreese@lemmy.world 43 points 1 week ago (1 children)

oh no the power is too cheap. God forbid our trillions of tax dollars go to something actually useful and good for the people oh well looks like we will get the F-47 instead and pay it to private military contracts 😂

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