[more_corn]

There’s a fusion reaction in the sky. All you have to do is harvest it. If you want to bring a fusion reaction home you have to deal with pesky things like INSANE AMOUNTS OF HEAT. Luckily the sky furnace is safely surrounded by 93M miles of insulting vacuum rendering the radiation harmless and even pleasant. We have a handy-dandy magnetic shield to handle surges, and atmospheric buffer for anything that sneaks through (now with protective ozone!) It’s really an ingenious design. I can’t think of any way to improve upon it.

[fragmede]

Harvesting energy from this "sky fusion reactor" (if it really exists) has this small pesky problem of being unavailable if you can't see the fusion reactor, in a daily phenomena known to scientific experts as "night", as well as this other intermittent problem dubbed "clouds" by scientific experts in weather and weather-related fields, so I can think of at least two places to improve upon sky-fusion-energy-harvesting technology. An at-home fusion reactor would not have problems there.

[nullhole]

One of my old favouries:

"Rotation Of Earth Plunges Entire North American Continent Into Darkness"

https://www.theonion.com/rotation-of-earth-plunges-entire-no...

[audunw]

Just by buying an electric vehicle I already have more than enough batteries to solve these problems for my household.

The transition to EVs - which is a hard necessity to solve climate change, and well on the way - implies battery production that’s already within an order of magnitude of storing enough solar to supply power year round. As long as you’re not too close to the poles, but most people don’t live there anyway (said as someone who lives relatively close to the arctic circle.. so I don’t mean to ignore our people, there’s just not that many of us so doesn’t matter so much in terms of global warming impact)

Nuclear energy can often benefit from some energy storage too. One of the first pumped hydro plants was to balance nuclear. It’s the opposite problem: people consume most of their energy during the day (when the sun is shining!) but nuclear should ideally run 100% 24/7.

I suspect a renaissance of nuclear, whether it’s fusion or fission, will also be paired with lots of battery storage. As batteries will probably soon be a cheaper way of load balancing than having to ramp production from nuclear up and down.

[ffgjgf1]

> Just by buying an electric vehicle I already have more than enough batteries to solve these problems for my household.

Not if you live in Northern Europe. Solar is basically worthless there during winter. I’m not even talking about polar nights, just places like Denmark where the difference in production between January and June is 20x. No batteries (that we know of) would solve that.

[moogly]

Indeed. I live in Northern Europe and have a 17.2 kWp solar plant. During the summer, I see ~100 kWh uselessly (for me) go to the grid every day for a pittance, and I can't really use it.

4 months of the year (almost 5 if it's a really bad year like last year), there's virtually no production.

I work in the smart energy field, including with home batteries. The de facto standard size is still 10 kWh because the promised drop in price hasn't yet materialized on this market. I'd fill that up in 45 minutes during a sunny summer day. I maybe can use half of that during the night. If I were to charge my car during the night, then sure, I could use that, but it's just 10 kWh. That's like an 1/8th of the car battery.

50 kWh? Okay great, I'd fill that up in 5 hours. Don't really know what I'd use those 50 kWh for. Charge my car? Okay sure, but I don't drive every day, and never in the morning, so it makes so much more sense to do solar surplus charging once or twice a week. You rarely want to charge to 100% SoC anyway, and you should probably leave some additional capacity for FCR purposes.

100 kWh? The problem is that in summer when I can fill that in a day (assuming max power scales with the capacity), I cannot really empty the battery because my consumption is so much lower during the summer. I will only top it up a little bit every day at best.

What I really need is a fucking 10 MWh sand battery underneath my driveway that I can seasonally charge and then use during the winter for heating. Maybe it could also keep my driveway snow and ice free? Who knows.

And A/C in the summer I guess. That is actually what I'm going to get, because it turned out to be more stressful and agonizing to see 100 kWh go out on the grid for almost no monetary gain than I thought it would. Call me egotistical I guess.

Domestic solar is kind of a scam. I knew that going in, but I didn't anticipate the accompanying stress.

[oezi]

1. The price drop for batteries has been huge. They are down to 3000 EUR where I live.

2. Domestic solar is just a way to save money. If you bought more than you need then you wasted money. A typical consumer would be fine with 10 kwp system + 10kwh battery which in Europe costs now less than 20,000 EUR.

[pfdietz]

This is solved by also using wind and hydrogen. Europe has salt formations that could store millions of gigawatt hours of hydrogen, far more than they'd need for long timescale leveling of variable supply.

[olddustytrail]

Denmark gets 67% of its electricity from renewables, mainly wind.

[kobalsky]

doesn't long-distance power transmission solve that problem? just put the solar panels somewhere else?

[travisb]

The 'somewhere else' is a big issue though. In order to deal with Northern Europe winter power demands you probably want those solar panels to be on the Tropic of Capricorn in the southern hemisphere.

That's along ways away. It'll take a lot of costly electrical infrastructure to move that power.

Even worse, if you want to work during the night, you also want the solar panels about 45 degrees west. So like in South America. Tough luck for those places where that sweet spot is in the middle of a large ocean.

[Qwertious]

>The transition to EVs - which is a hard necessity to solve climate change

If we're talking about batteries, trains don't need them. While we'll never get rid of cars/trucks entirely, we are massively overdependent on cars/trucks for the bulk of our transport and (land-based) shipping needs. Especially in cities.

[hyperhello]

Do you really not know of the progress that’s been made in the thirty years since you’ve been telling that joke?

[katbyte]

Insane amounts of heat is exactly what you want from your power plant..

[choilive]

Being pedantic, but most heat is considered "waste" heat - aka it is high entropy energy, which is much harder to convert into the more useful forms of energy (mechanical, electrical, etc.)

[mr_toad]

Most power plants (coal, gas, geothermal, nuclear) and some solar plants already use a heat engine. Modern designs can capture nearly half the heat energy for use as electricity.

[arp242]

If it was that easy people would just do it, hm? Classic "HN commenter solves world problem after thinking about it for 5 seconds".

> insulting vacuum rendering the radiation harmless

Not even this is correct. Vacuum doesn't really "insulate" against radiation, at least not very effectively. It's the earth magnetic field and atmosphere that protects us. And even with that it's not harmless – surely you heard of "sunburn" and "skin cancer"?

[xboxnolifes]

One way to improve upon the design is being able to capture the radiation from all sides of the reaction.