An old submarine hull (ridged structure) would work nicely as a reservoir.  
Anchor the old hull bow down with a pipe to the surface  in the stern and some 
remote operational valves installed in one or more torpedo tubes at the front 
door(s) of the tube(s).  install a screen on the outside of the hull with a 
high pressure nozzle(s) to clean the screen based on a measured pressure drop 
across the screen.

Install one or more  turbines in the tubes.  With energy to store pump the hull 
empty.  To use the stored energy, open the front doors and the vent pipe to the 
surface.  Regenerate electrical energy via water flowing into the hull under 
pressure at the depth of the anchored hull.  It would be a nice constant 
pressure to run the turbines.

Hulls could be anchored in clean water to avoid clogging the screens 
excessively.  The bigger the hull and the deeper it is anchored would determine 
the amount of energy stored.  It would be significant.

Bob Cook

From: David L. Babcock<>
Sent: Wednesday, November 1, 2017 10:43 AM
Subject: RE: [Vo]:Article on approaches to energy storage

You and I concur on all the details of a workable solution -it was just that I 
thought I clearly read that it was a flexible structure…
Ol’ Bab

Sent from Mail<> for Windows 10

From: Jed Rothwell<>
Sent: Tuesday, October 31, 2017 7:55 PM
To: Vortex<>
Subject: Re: [Vo]:Article on approaches to energy storage

David L. Babcock <<>> wrote:

I read the hole-in-water one. All BS, and stupid. To get a “head” the hole has 
to be not just empty when the seawater enters, it has to have a rigid shape. 
But when empty, and 100 feet deep, the upward pressure on the bottom will be 50 
psi . . .

I believe you are envisioning something like a single structure. A gigantic 
bathtub or ship hull. I do not think that is what this "hole in the ocean" will 
be. It will resemble a dike in the Netherlands or New Orleans, below sea level. 
Or like a earthen dam. No doubt some water will leak through the walls but 
earthen dams work well and do not leak much.

Water is let into the structure in one place only, where the generator turbines 
are located. This is like putting turbines in one part of a dam and forcing all 
of the water to go through them.

There would be no "upward pressure" and no structure to push up. It is just a 
large lake that happens be located in the ocean. If you were to go to an island 
and dig a pond in the middle of it, digging until it goes below sea level, you 
would have a similar structure. The walls and bottom of the pond would be rocks 
and sand, not anything that can pop up.

You could build a similar structure next to a large lake (such as one of the 
Great Lakes) or the Hudson River. It would be large hole that extends well 
below the surface of the lake or river, located perhaps a kilometer away from 
the lake.

- Jed

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