Re: Buying rail tickets

On Tue, 29 Apr 2008 10:54:42 +0000 (UTC) someone who may be Adrian
<toomany2cvs@xxxxxxxxx> wrote this:-

Anyone using an external electricity supply gets it via a connected
system. Over the course of a year the electricity taken by a customer is
matched by the electricity put into the system by their supplier (or
they buy someone else's electricity to fulfil this obligation).

Yes - and no.

The balance of power supply is not dictated by the preferences of the end
customers, as you seem to imply, but solely by the availability of
existing power sources and their varying viability - both economic and
socio-political.

You need to state the timescale over which your contention applies.

After gate closure the precise balance is determined by the system
operators and how well the bids made by generators match what
actually happens [1].

Before gate closure there is a market amongst the various generators
who make bids to supply electricity. This market isn't entirely free
due to capacity constraints on the system and various regulations
from government.

In the longer term there is action by system operators and
regulators in the form of statements of capacity which are intended
to signal long term investment.

An individual consumer will either indicate that they are not
bothered where the electricity comes from, by purchasing from a
tariff where this is not specified, or they will indicate that they
are bothered, by purchasing from a tariff where this is specified.

If they decide on the latter then it is measured over a year and the
supplier will match the consumption with units supplied to the
system by the particular form(s) of generation specified by the
customer. That is how the railways get traction electricity from
nuclear power stations.

To claim that the railways are somehow inherently responsible for nuclear
power generation

That is not a claim that I made. When you learn to answer the points
people make, rather than making assertions about points people did
not make, you will become better at debating.



[1] any form of generation can fail to produce the expected output
at any time. See for example the collapse of the coal conveyor at
Longannet.


--
David Hansen, Edinburgh
I will *always* explain revoked encryption keys, unless RIP prevents me
http://www.opsi.gov.uk/acts/acts2000/00023--e.htm#54
.

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