On 25/01/2020 20:34, newshound wrote:
On 19/01/2020 13:37, Chris Hogg wrote:
On Sun, 19 Jan 2020 13:17:14 +0000, Pancho
wrote:

On 19/01/2020 12:53, Chris Hogg wrote:

Lots of 'potential' storage solutions, such as compressed air into
underground caverns, trundling very heavy weights on rail tracks up
mountains, Tesla-type batteries everywhere and so on. But none of it
comes near to pumped storage in terms of capacity, and that's very
dependent on the right topography, most of which has already been
used. Those other solutions may be OK for very short term
peak-lopping, but none are capable of storing the amounts of energy
needed to run the country for a several days at this time of year,

OK, I was seeing quotes of hydrogen storage providingÂ* months energy
supply as opposed to a few hours for pumped storage. The main difference
being hydrogen is 40% efficient where as pumped is 80% efficient.


But how and where are they going to store a month's worth of hydrogen?
The volume would be absolutely huge, even if compressed. The phrase
'greens don't do sums' is occasionally trotted out on this NG. That
looks like a classic example of just that.

Maybe confusion with the fact that you can store quite a lot of energy
in LNG much more cheaply than Hydrogen. (I do mean LNG, not LPG).

In the distant days when terrorism concerns were rather less, anyone
could easily see a substantial LNG tank farm only a couple of miles from
the centre of a large UK city, and still surrounded by housing. Worse,
it was within range of an RPG from unsecured areas. My recollection is
that it stored something like a month of peak consumption for the city.

The (now decommissioned) storage near here was targetted by the IRA many
years ago. A friend of mine knew one of the police officers that gave
chase (had to give up the chase when the car was shot and lost power)
and got to listen to a recording of the running commentary he was giving
on the pursuit. It was, unsurprisingly, peppered with expletives for the
whole period after they started shooting.

SteveW