Quote:
Originally Posted by FactaNV
My main concern is that according to the article I was reading, it needs hilly terrain. Would it be feasible here without the grade changes typically associated with the sites? The few pictures I saw look almost mountainous.
|
I should have explained Pumped-Hydro better. Sorry. Pic attached (just noticed the pic is backwards lol).
Pumped hydro is just reversible hydro. All hydro needs "hydraulic head". It's the gravity of water that generates power. So if we have dam already, it can be converted to pumped-hydro.
How it works:
During the day, excess wind/solar power is used to pump water from the lower reservoir to the higher one.
At night, that water is released to the lower reservoir, producing power while solar/wind is offline.
An open loop reservoir can function as both regular hydro (accepting inflow from a river) AND pumped-hydro at the same time.
The Grand Rapids Dam (Cedar Lake to Lake Winnipeg) is already chooching 500mw. It has a hydraulic head of 120feet.
To convert it, the dam reservoir doesn't change. In fact, it's possible that simply energizing the generator (IE reversing it) could convert. Or, pumps/reversible generators are swapped.
The current 500mw capacity is too small though. If you want to serve as a battery for a region this big, you need 5,000 to 10,000mw capacity or even more. You will get rapidly fluctuating lake levels. But if you want the billions, deal with it.