On Thu, 14 Aug 2014 11:52:10 +0100, news
wrote:

On 14/08/2014 08:49, The Natural Philosopher wrote:

Snip


'It is important to point out that pumping generates more power than it
consumes'

http://www.halcyontidalpower.com/the...al-protection/




At this point you just know its fairy dust




Not saying that this system doesn't have other issues, but as I see it
this single statement is not necessarily wrong. Sure if you are just
moving water from one lake to another it is, but this is a tidal
situation.

If you pump water from the sea to the lagoon when the sea is six inches
below the lagoon, and let it out when the sea is six feet below the
lagoon, would this not generate more energy than consumed? (OK the six
inches and six feet might not be the right numbers because of efficiency
losses but in principle?)

Its far from a perpetual motion machine since you are relying on a
dropping sea level to increase the head.

That's about the only way that pumping more sea water behind the
barrage would make any sense (when the tide has already done 70 or 80
percent of the work for you).

It would only be used when such a high tide coincides with an
off-peak demand period when the electricity costs make it economic
enough to store additional energy in the system which can then be sold
back to the "Grid" on the following demand peak.

Unlike other forms of "Green Energy", this system can act as both a
green primary energy source and a green energy storage sink to further
help maintain stability in the Grid.
--
J B Good