by Twilight » Tue 22 May 2007, 18:56:16
$this->bbcode_second_pass_quote('Tyler_JC', 'M')oreover, there is a rather large surplus of electricity at night. Using the extra electrical production capacity at night to charge up cars seems like a reasonable solution to the overcapacity-at-night problem.
It's not quite that simple.
First of all, the night-time low load period is needed to maintain cooling cycles on overloaded equipment. The situation in the UK is less dire than it is in the US, but there are always bottlenecks and the night is a life-saver. Remember that since no-one has really planned for mass electric car ownership, no-one has planned for not having night-time low load whenever you need it. Once it is no longer there, assumptions change and comfortable old arrangements need to be reassessed. Fixing all of that requires capital expenditure in excess of what is permitted by the regulator, so it is not a problem that can be solved in under a decade.
Secondly, there is no surplus of electricity as such because the coal and gas plants are ramped down, dispatch is matched to predicted load. With night-time load predictably flat, it is largely left to the nuclear baseload. If the coal and gas plants were ramped up with no load to feed, you would have one hell of a system frequency (then network stability) problem. Thus there is not a vast amount of energy being wasted.
What you
do have, is
surplus of available generating capacity. This distinction is very important to make. If you want to fill in that dip with electric car charging, you are going to run coal and gas plants at a higher output and burn more fossil fuel. Obviously you are already burning some just by idling, but when the car battery chargers kick in, the power plant people are going to hit the gas pedal. This means reliance on imported oil for transport ultimately shifts to imported coal and gas. All this would do is move the problem to a different sector without solving it.
$this->bbcode_second_pass_quote('JPL', 'T')he idea that cheep energy (in Europe & the UK) is somehow both a right of man and a status-symbol is a myth that was born out of post-war optomism and it really has no foundation in fact. The one exception possibly being the UK & Holland during the glory-days of the North Sea. Well that's over now.
Which is where this bit comes in. This bit is right. Instead of moving energy consumption from one sector to another (at the end of the day it is all non-renewable BTUs), we should eliminate necessity. Not to save the world, but because cheap and plentiful energy is a drug dependency, and if your supply is compromised, it is better to break up the withdrawal symptoms into nice managable chunks than shiver in the dark.