They work pretty simply. You have a hill with a reservoir at the top and at the bottom. You have the ability to pump the water from the low reservoir to the higher reservoir. When the water comes down it pushes turbines that create electricity.
So when energy is cheap you pump the water up and when it is dear you produce energy. This is what batteries do as well.
The issue is still that these are firming options that are not long term in nature. I don't think this is something to get too worried about now. These issues exist now anyway. They just fire up gas peakers to manage the extra load that is required. The issue is replacing these gas peakers but we aren't at the stage where we are 95% of the way there. Just say now we are 50% of the way there now. We have a lot further to go prior to this being the main issue.
The issue is really complex because a lot of the coal plants are now becoming uneconomic. They don't scale up and down quickly and since renewables are cheaper they can be running at a loss.
Awesome video. This is getting me excited. I couldn't believe my ears when he stated how long our power lines run and the maintenance.
Adelaide seems to be doing a great job but they also buy reserve power don't they? I not saying that's wrong, I'm still learning.
Having said that, would or should the states join forces between having reservoirs/hydro, solar and wind and storage?
I raised the salt water idea mainly because if there was a crazy workable way to get hydro from it then the source would never dry up and is free

So going by a bit of what you suggested why wouldn't this work.....
Build an upper reservoir on a hill/cliff near the coast and use the ocean as the lower reservoir.
When you have surplus power (e.g., from wind/solar), pump seawater up.
When you need power, let it flow back down through hydro turbines.
It would also be a balancing act of water levels for the hydro to work.
The last thing we want to do out of all the ideas is not to ruin the earth, no more Darling river disasters.
As far as fresh water goes, I wasn't thinking about flooding part of the interior from a power perspective but more from an environmental and conservation one.
The interior is apparently a lot higher and a long way away from the freshwater flood plains of NT so to get fresh water into an interior dam would cost a fortune I suspect.
I just thought if we could somehow flood huge amounts of wate into the interior it would make it a virtual gigantic Kakadu instead of wasting giga litres of fresh water into the sea. Divert the monsoon floodwater inwards to a controlled degree.
It would help our indigenous folk with all year round water supply and wildlife food as we have ruined a lot of their traditional hunting grounds. Also it would also help the climate. Our own Amazon
