jonescg said:
Cotter dam looks like a good candidate for pumped hydro in the ACT:
https://www.google.com.au/maps/place/35%C2%B026'39.1%22S+148%C2%B051'05.3%22E/@-35.4456895,148.8267384,11z/data=!4m14!1m7!3m6!1s0x6b17b76c44194b5f:0xc7482c48c1462c8!2sCotter+Dam,+Australian+Capital+Territory!3b1!8m2!3d-35.3202853!4d148.939818!3m5!1s0x0:0x0!7e2!8m2!3d-35.4441987!4d148.8514797!5m1!1e4
Zoom out to see the three reservoirs. Top one is at 1000 m, middle one at 800 m, and the main dam at 600 m.
Surely you could use the top two reservoirs for pumped hydro?
You probably could, but when you look at the capacity of the top dam (11.5 GL) you find its only good for approx 100MW for a day before its drained empty...which you wouldnt want to do, so say 12-18 hrs overnight use at 100MW.
Thats less tha 0.5% of the proposed Snowy 2 project .
but at what cost ?..several miles of tunnels/huge pipes,... pumping/generation plant,.. HV power interconnect lines to the grid,..all = a cost totally out of proportion to the capacity.
And of course there is the little matter of the Cotter being the main water supply for the ACT.....
...they may not like the idea !
Face it, Australia is not a good candidate for Hydro, or Pumped hydro storage even using sea water sources,
The geography and logistics simply make it a financial impossibility.
Just for a feel of the order of magnitude for the financials....
Each GW of PH and its associated 4+ GW of supporting solar,.. is going to cost approx Au$10bn, and we need approx 20 GW minimum to keep the lights on and factories working over night.
So that $200bn just for a bare one nights cover, and assumes full sunlight every day, so we need to increase that by a factor of 3-5 at least ($1000 bn ?) to give some cover for bad weather etc.
But , that still is not a SECURE power supply