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<mailto:olb...@gmail.com> Sent: Wednesday, November 1, 2017 10:43 AM To: email@example.com<mailto:firstname.lastname@example.org> 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<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows 10 From: Jed Rothwell<mailto:jedrothw...@gmail.com> Sent: Tuesday, October 31, 2017 7:55 PM To: Vortex<mailto:email@example.com> Subject: Re: [Vo]:Article on approaches to energy storage David L. Babcock <olb...@gmail.com<mailto:olb...@gmail.com>> 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