Cantclimbtom said:The mine idea has far more potential to extract money from investors. Viewed in terms of potential investment not potential energy it has great promise. Amusing mine parallels with the old salting scams?
Graigwen said:The American equivalent is:
"A hole in the ground with a liar at the top"
The latter quote is also the title of a book by Dan Plazak subtitled "Fraud and deceit in the Golden Age of American Mining" While checking the authors name I noticed next it on my bookshelves four books on the Bre-X fraud.
Fjell said:It?s quite hard to make energy storage pay outside of providing very short term stability to large utilities
I'm not so sure that a drop-weight in a mine shaft would be ideal. Assuming the weight is at the top of the shaft ready for action and generator coupled to it is not rotating, it would take some seconds to spin the generator up to speed as the weight starts to drop.PeteHall said:... backup generators take 20s or so to start up, so large battery banks are usually provided to plug this gap. One technology starting to appear on the scene is the use of flywheels, which can provide instant power for up to 40 seconds in the event of an outage, uf they need to be in constant motion so they are ready if/when needed.
In this scenario, a drop-weight in a mine shaft would be ideal ...
pwhole said:Not energy storage, but generation - looks like an interesting idea though. The footsteps will always happen, so in that sense it is 'free':
Scientists have developed technology that can turn footsteps into electricity. By tapping into an unexpected energy source, wooden flooring, researchers from Switzerland have developed an energy-harvesting device that uses wood with a combination of a silicone coating and embedded nanocrystals to produce enough energy to power LED lightbulbs and small electronics. This device, called a nanogenerator, is based on sandwiching two pieces of wood between electrodes.
RobinGriffiths said:Think I'll invent an anti-splashback toilet instead. Already got the name - The Vortex Turdmaster?.