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They should do dynamic pricing throughout the day and then there would be a market for users to use smart devices to schedule load, when to charge batteries vs
by eksu 9y ago
They should do dynamic pricing throughout the day and then there would be a market for users to use smart devices to schedule load, when to charge batteries vs when to discharge batteries, etc.
- tantalor 9y agoPump all the water up hill.
- HankB99 9y agoI wonder if that was a tongue in cheek comment or if you knew this is already done. https://en.wikipedia.org/wiki/Ludington_Pumped_Storage_Power_Plant https://en.wikipedia.org/wiki/Ludington_Pumped_Storage_Power...
- maxander 9y agoMy goodness- built in the sixties, stores several GWh, and has 70% efficiency. Enough of those would solve the curtailment problem altogether. Not sure how a technology that relies on the availability of titanic quantities of fresh water is going to play out in California, though. :(
- jaggederest 9y agoIt doesn't need to be fresh, you could dam a certain bay and put generator/pumps in the wall. Pump a cubic mile of water back and forth as needed, and you get tidal generation for free, too.
- Zeta_Function 9y agoYou can do the same thing with compressed gas as well, or really anything. Gas and fluid do make the most sense in terms of directly driving generator turbines though. The only issue with gas is thst you have to deal with thermal effects from expansion and compression.
- kumarvvr 9y agoUsing compressed gas for energy storage has a lower cycle efficiency. Compressing heats up the gas. Heat has to be stored and used when decompressing, else a significant portion of energy is lost and the cycle efficiency is dragged into the low 50% range, or even less.
- Zeta_Function 9y agoTrue, I did mention thermal effects, but it’s also something you can do in a place like Cali, Nevada, Riyadh, etc Without wasting precious water. Other options include giving up on the idea of these systems and going for giant Vanadium flow batteries or something similar.
- kumarvvr 9y agoVanadium flow batteries are an extremely interesting concept. But with lower power densities, they seem to be more suitable for use in a local community, rather than individual homes or grid scale plants.
- milesvp 9y agoTidal generation using dams is a very bad idea. You're taking energy from and releasing energy to the system at times when it's most detrimental to the inertia of the system. Basically you're stealing inertia from the rotation if the earth, which would be ok, except you're amplifying the effects because of timing. You can think of it like swinging in a swing. The way you build up a huge amount of momentum is by shifting your weight at the peaks and troughs of the arc.
- jaggederest 9y agoAll hydropower does this, and changes the rotation of the earth. I believe the stated value was speeding the rotation up a few milliseconds per day due to the fact that so much water is held in the northern hemisphere in reservoirs. The ultimate result is that the moon falls towards the earth a couple micrometers and everything is fine.
- jmbohlen 9y agoThis technology is currently used in California and has been since 1984. https://en.wikipedia.org/wiki/Helms_Pumped_Storage_Plant https://en.wikipedia.org/wiki/Helms_Pumped_Storage_Plant