On Mon, 16 May 2016 15:14:06 +0100, Mike Tomlinson
wrote:


"This is because the two reservoirs are linked by one of Britains biggest
post-war industrial projects: the Dinorwig pumped storage power station,
hidden within this mountain. It is effectively a monster battery: power is
stored by pumping water from Llyn Peris to Marchlyn Mawr at night, then
generated by letting it flow back down at times of peak demand"

http://www.theregister.co.uk/2016/05...tric_mountain/


Went around in 2003 - very impressive. Would be even more impressive
in solar/wind could be used to refill the top reservoir.
--
AnthonyL