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From: Bill Sloman <bill.sloman@ieee.org>
Newsgroups: sci.electronics.design
Subject: Re: OT: EV Charging Stations Stripped of Copper Cables
Date: Fri, 5 Jul 2024 15:01:24 +1000
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On 5/07/2024 6:32 am, alan_m wrote:
> On 04/07/2024 19:21, RJH wrote:
> 
>> Interesting (to me) that the UK's consumption has gone *down* about 
>> 20% over
>> the past 50 years. Note I'm talking about the UK - the figures from 
>> that link
>> suggest that consumption and (not surprisingly) generation have been 
>> going
>> down for quite a while. Meanwhile, China has trebled, and India has 
>> doubled,
>> in the past 20 years.
> 
> Possibly because of the UK having less heavy industry and importing our 
> products that rely on heavy energy usage from China or the far east etc.
> 
> Industries that were once heavy users of electricity probably had 
> contractual agreements stating that it wouldn't be used in peak domestic 
> times.
> 
>>> shows the annual rate of growth of generating capacity has been up to 6%
>>> per year (though it been has closer to 2.5% per year recently), and if
>>> we spread that 30% rise over six year it is 4.5% per year, which is
>>> clearly practicable.
>>> Cars and trucks don't get replaced every year. We aren't all going to go
>>> over to electric vehicles fast enough to create any kind of insoluble
>>> problem.
> 
> Is that 30% in the past 6 years mainly due to the installation of more 
> wind turbines which produce little when the wind barely blows for 
> periods of weeks? Possibly also solar which produces little during the 
> winter and nothing at night. Has there been a corresponding 30% increase 
> in the backup capacity to fill the shortfall when wind fails? If the two 
> are not matched then it's rather silly to rely only on extra 
> intermittent power generation, especially during a cold winter.

The quote was that  the UK's *consumption* has gone *down* about
20% over the past 50 years.

Where  the power consumed has come from doesn't come into that.

With intermittent power sources you do need to install enough capacity 
to generate the total output you need - which is a lot more generating 
capacity  than you'd need if the sun shone and the wind blew all the time.

That does get figured into the cost of the power actually generated, and 
they are still the cheapest sources around. Once you've got a lot of 
intermittent renewable sources in your generating capacity, pumped or 
battery storage is also necessary. Fast start gas-turbine powered 
generators have been around for quite a while now, but they don't 
generate power as cheaply as renewable sources, and they would bbeing 
phased out even if they weren't CO2 emitters.

> Although unlikely to happen within the timescales the green lobby would 
> like there is also the move away from gas and oil to electric for 
> central heating that will increase demand for electricity.

Sure. But heat pumps push out a lot more heat energy than the electrical 
energy used to drive the compressor.

-- 
Bill sloman, Sydney



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