this post was submitted on 09 Apr 2024
1650 points (96.0% liked)
Solarpunk
5324 readers
140 users here now
The space to discuss Solarpunk itself and Solarpunk related stuff that doesn't fit elsewhere.
Join our chat: Movim or XMPP client.
founded 2 years ago
MODERATORS
you are viewing a single comment's thread
view the rest of the comments
view the rest of the comments
We need natural batteries like solar power lifting water from a lake into a reservoir so that when we need that energy and the sun isn't making it, released water does
A cubic meter of water above your roof has the storing capacity of a AAA cell. That's why you need huge, massive damms to store any significant amount of power. But unfortunately it's not flexible enough (you need mountains nearby) or dense enough.
There are already companies making thermal storage systems to store excess energy. They heat sand up to about 500 degrees when there's excess power and then convert it back to electricity or just use the heat directly for heating water or living spaces.
There's also companies (googles do nothing but link to YouTube videos) working on scaling this down to about the size of a water heater.
What about storing energy as potential energy using some high density objects. This may work.. Right?? gravitricity Check out their work.
Yes, suspended weights, also spinning flywheels, hot salt, hot sand
There's options besides pumped hydro, hydrogen and batteries
It's slithly better the more dense the material, but that's basically the same thing. You could say that depending on the location, using water is much more practical.
A much more interesting one I saw was the molten salt ones, where basically you store the energy as heat in a sealed place, and then when you need it, you use that heat to run turbines.
I don’t think it’s feasible.
https://youtu.be/XxGQgAr4OCo
Interesting concept, thanks for sharing
Yes this exists and it's called pumped storage hydroelectricity
I did some work at a place called The hollow mountain that does this. But seeing as it looked like an underground James Bond bad guy base and I was a rope access mook in a boiler suit, I felt like I could die at any moment by tuxedo clad hero.
It wasn't solar they used to power pump the water back up though. They just, hmm I want to say, bought cheap electricity when no one was using it.
This is the imperial base from Andor, right? Cool
Holeey sheet it is! I didn't know that! Thanks.
With an energy conversion efficiency of usually 75 to 80 % they are really efficient and don't have as much energy loss as other types of energy storage. It's a simple, but powerful concept and I find it beautiful. However, there is some concern regarding their impact on the local ecosystem. Not only do they need huge water reservoirs, which are artificially created and therefore might impact nearby rivers and even fish migration, but the way they are sealed with concrete or asphalt also disallows the development of riparian vegetation. From an ecological perspective they are basically dead zones.
Still, considering several alternatives, I think it's one of the better options. Although it's not cheap to build those, which is a problem in our current capitalitic society