Post by: geoff on 01 January, 2020, 01:44:11 pm
http://www.gridwatch.templar.co.uk
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Post by: nicknack on 01 January, 2020, 02:26:17 pm
Post by: sizbut on 01 January, 2020, 02:31:00 pm
Post by: Cudzoziemiec on 01 January, 2020, 03:02:30 pm
My fav: http://grid.iamkate.com/ (http://grid.iamkate.com/)The demand trend over the past seven years is interesting. What's the explanation for that?
Post by: hellymedic on 01 January, 2020, 03:11:07 pm
For myself, my electricity bill now shows NO seasonal variation and I'm using less overall.
My winter lighting & heating for David's observatory seem to be almost exactly balanced by refrigeration in the summer.
I don't think washing machine use varies much.
Post by: rob on 01 January, 2020, 03:22:48 pm
My fav: http://grid.iamkate.com/ (http://grid.iamkate.com/)The demand trend over the past seven years is interesting. What's the explanation for that?
Renewable generation within the distribution zones (mostly sub 50MW installed capacity) is treated by Grid as negative demand. Peak Winter demand has been down about 10%, some of which is caused by lower usage at the meter.
The growth in small scale renewables has stalled with the removal of subsidies, but expect that to change in the next 1-2 years.
Post by: Cudzoziemiec on 01 January, 2020, 03:27:57 pm
So in simplistic terms, the same amount is being used but an increasing amount of that is being offset by production from rooftop solar fed into the grid? And presumably local schemes like municipal generation from waste incineration.My fav: http://grid.iamkate.com/ (http://grid.iamkate.com/)The demand trend over the past seven years is interesting. What's the explanation for that?
Renewable generation within the distribution zones (mostly sub 50MW installed capacity) is treated by Grid as negative demand. Peak Winter demand has been down about 10%, some of which is caused by lower usage at the meter.
The growth in small scale renewables has stalled with the removal of subsidies, but expect that to change in the next 1-2 years.
Post by: perpetual dan on 01 January, 2020, 03:33:55 pm
http://www.gridwatch.templar.co.uk
Interesting that they give coal one of the bigger four meters when it looks like it's about the 6th largest source this year.
Post by: Kim on 01 January, 2020, 04:47:19 pm
So in simplistic terms, the same amount is being used but an increasing amount of that is being offset by production from rooftop solar fed into the grid? And presumably local schemes like municipal generation from waste incineration.My fav: http://grid.iamkate.com/ (http://grid.iamkate.com/)The demand trend over the past seven years is interesting. What's the explanation for that?
Renewable generation within the distribution zones (mostly sub 50MW installed capacity) is treated by Grid as negative demand. Peak Winter demand has been down about 10%, some of which is caused by lower usage at the meter.
The growth in small scale renewables has stalled with the removal of subsidies, but expect that to change in the next 1-2 years.
There's been a reduction in energy use too, mainly due to more efficient lighting. I don't expect that to continue.
Post by: rob on 01 January, 2020, 05:11:35 pm
So in simplistic terms, the same amount is being used but an increasing amount of that is being offset by production from rooftop solar fed into the grid? And presumably local schemes like municipal generation from waste incineration.My fav: http://grid.iamkate.com/ (http://grid.iamkate.com/)The demand trend over the past seven years is interesting. What's the explanation for that?
Renewable generation within the distribution zones (mostly sub 50MW installed capacity) is treated by Grid as negative demand. Peak Winter demand has been down about 10%, some of which is caused by lower usage at the meter.
The growth in small scale renewables has stalled with the removal of subsidies, but expect that to change in the next 1-2 years.
Rooftop but also most large-ish solar and onshore wind. Even a big field of solar won’t warrant Grid’s attention. They’re also not very good at forecasting - we don’t use their numbers at work and use other sources.
Demand is also down, though. More industrial and commercial than domestic - recession did for quite a lot of business and other consumption has moved off-shore.
Post by: rogerzilla on 01 January, 2020, 07:57:15 pm
I suspect incandescent lamps were also a lot more prevalent. I kept them for a few things because CFLs were so shite. Now there are decent LEDs, it's much better.
The biggest user of energy in most homes is, however, the fridge/freezer.
Post by: hellymedic on 01 January, 2020, 08:15:08 pm
Post by: Kim on 01 January, 2020, 08:57:57 pm
Post by: Cudzoziemiec on 01 January, 2020, 09:24:53 pm
Post by: Joe.B on 01 January, 2020, 09:37:22 pm
http://www.gridwatch.templar.co.uk
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Thanks for posting that Geoff, as well as being interesting in its own right having followed one of the links I've discovered that I can book a tour of my friendly neighborhood nuclear plant. ;D
Post by: Kim on 01 January, 2020, 09:43:39 pm
LEDs have started to replace discharge lighting in industrial/outdoor applications, though those were already relatively efficient.
(Of course, fixture reliability is another matter. But we're talking electricity demand.)
Post by: geoff on 01 January, 2020, 11:51:29 pm
That's great! I've just been reading about Chernobyl
http://www.gridwatch.templar.co.uk
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Thanks for posting that Geoff, as well as being interesting in its own right having followed one of the links I've discovered that I can book a tour of my friendly neighborhood nuclear plant. ;D
after watching the HBO series. So I'm experiencing mixed feelings about nukes. BTW credit where its due.. I got the link in the OP from a comment posted in the Grauniad...and thought it needed setting free over here! Sent from my STF-L09 using Tapatalk
Post by: geoff on 01 January, 2020, 11:56:12 pm
"Zero-carbon electricity outstrips fossil fuels in Britain across 2019"
https://www.theguardian.com/business/2020/jan/01/zero-carbon-energy-outstrips-fossil-fuels-in-britain-across-2019?CMP=Share_AndroidApp_Copy_to_clipboard
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Post by: Pedal Castro on 02 January, 2020, 06:39:01 am
http://www.gridwatch.templar.co.uk
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This is a great resource for physics teachers, I used to use it when covering the energy generation topic. Coal use has gone down quite a bit since then!
Post by: ian on 02 January, 2020, 09:22:29 am
http://www.gridwatch.templar.co.uk
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Thanks for posting that Geoff, as well as being interesting in its own right having followed one of the links I've discovered that I can book a tour of my friendly neighborhood nuclear plant. ;D
It's worth doing, I've done a few in both the US and UK. Admittedly, I don't need to turn the lights on after dark now. The guide at the local one in Connecticut told me the core was so safe I could kick it. So I did. The next day they had to turn it off for safety reasons.
Post by: pcolbeck on 02 January, 2020, 12:40:47 pm
Businesses are still using broadly similar computers (there's been some shift to laptops for office workers), but they've replaced a lot of inefficient lighting, especially in the commercial sector where CFL never replaced halogen for many applications.
I dont know about that. Modern processors are much more power efficient than older ones. They dont get as hot as they used to and they scale theri performance when its not needed so office computers will be more efficent. You dont see CRTs anymore either.
Datacentre stuff is a lot more efficient these days. Power and cooling are one of the biggest costs in a DC. Virtulisation has seen compute estate reduced masively from hundreds of bare metal servers to far fewer servers running lots of VMs (or containers or whatever the flavour of the day is). Also the switches in DCs are a lot more efficent than they used to be, unused ASICs and optics get no power delivered to them.
Post by: simonp on 02 January, 2020, 12:56:42 pm
This shows CO2 emissions (colours from green through black) per kwh for various countries around the world. Most countries have no data. Notable dirty countries are Poland, Australia, with somewhat less dirty being various Midwest States and some of the smaller European countries. Click on a country for 24h history of CO2 and sources.
Post by: Kim on 02 January, 2020, 01:04:19 pm
Businesses are still using broadly similar computers (there's been some shift to laptops for office workers), but they've replaced a lot of inefficient lighting, especially in the commercial sector where CFL never replaced halogen for many applications.
I dont know about that. Modern processors are much more power efficient than older ones. They dont get as hot as they used to and they scale theri performance when its not needed so office computers will be more efficent. You dont see CRTs anymore either.
I wasn't thinking as far back as the CRT era; the graph was for about 10 years of demand. Dell Optiplex level kit has't changed that much, and spends most of its time twiddling its electronic thumbs while the user stares at Excel/Facebook.
Quote
Datacentre stuff is a lot more efficient these days. Power and cooling are one of the biggest costs in a DC. Virtulisation has seen compute estate reduced masively from hundreds of bare metal servers to far fewer servers running lots of VMs (or containers or whatever the flavour of the day is). Also the switches in DCs are a lot more efficent than they used to be, unused ASICs and optics get no power delivered to them.
Oh, sure. But has that reduced overall power demand, or has that just enabled a lot more computing to happen for the same (or increased) number of electrons? If I had to guess, I'd imagine a lot of that computing is now happening Somewhere Else, clouding (pun intended) the issue. (That's an interesting question, actually: How much of the UK's electricity demand takes place in other countries, via the internet? How would you even begin to account for that...)
Post by: rob on 02 January, 2020, 02:45:29 pm
Gas and nuke are marginally less interesting. I have walked round on-shore wind farms but there's not that much difference between them. For something completely different Dinorwig is an excellent trip.
Post by: fuaran on 02 January, 2020, 03:13:22 pm
Here's the original article:Only if you class nuclear as "zero carbon".
"Zero-carbon electricity outstrips fossil fuels in Britain across 2019"
https://www.theguardian.com/business/2020/jan/01/zero-carbon-energy-outstrips-fossil-fuels-in-britain-across-2019?CMP=Share_AndroidApp_Copy_to_clipboard
Maybe zero carbon at the point of generation, but how much carbon involved in mining and processing the uranium, then disposing and storing it afterwards.
Post by: Tim Hall on 02 January, 2020, 03:16:07 pm
Post by: ian on 02 January, 2020, 03:17:38 pm
...
Oh, sure. But has that reduced overall power demand, or has that just enabled a lot more computing to happen for the same (or increased) number of electrons? If I had to guess, I'd imagine a lot of that computing is now happening Somewhere Else, clouding (pun intended) the issue. (That's an interesting question, actually: How much of the UK's electricity demand takes place in other countries, via the internet? How would you even begin to account for that...)
It's an interesting question, I'm sure much of our power-intensive big industry has gone elsewhere. We forget that it wasn't just labour we outsourced. My mothership stuff generally runs out on Amazon servers ostensibly in Oregon (but who knows if it's physically located there, or just another layer of virtualization). Our in-house electron shuffling is in India (though, like a lot of companies these days, we're pulling out in favour of another location). In the UK, it's just laptops and the occasional server, and most of the admin stuff now runs on Azure.
But anyway, as ever we're dumping out emissions elsewhere. Be it China-manufactured Christmas tat or cloud datacentres. Out of sight, out of mind.
(I suspect we'd be a lot less keen on EVs if the cobalt, rare earths etc, where under the home counties.)
Post by: Cudzoziemiec on 02 January, 2020, 03:53:10 pm
Post by: Cudzoziemiec on 02 January, 2020, 03:55:21 pm
Have a look at http://www.electricitymap.org/Even Poland has plans to clean up its electricity generation, but by building at least one nuclear power station rather turbines or solar. I expect renewables are for gays and Muslims. But what's most noticeable about that map is how few countries actually have figures.
This shows CO2 emissions (colours from green through black) per kwh for various countries around the world. Most countries have no data. Notable dirty countries are Poland, Australia, with somewhat less dirty being various Midwest States and some of the smaller European countries. Click on a country for 24h history of CO2 and sources.
Post by: ElyDave on 02 January, 2020, 04:13:10 pm
I went to Dungeness A a few years ago to look at a pile of 20 foot containers. After I'd done that my host asked if I'd like a look round. That'll be a yes. In a door, wandering round a partly decommissioned nuclear power station, full of 1950s tech. What's not to like?
I used to do the health and safety for part of a previous company the did stuff at Harwell, spent one afternoon being given a tour of one of the early experimental reactors by the archetypal mad scientist. It was fascinating, but you also got a sense of just how seat of the pants some of it was.
Post by: simonp on 02 January, 2020, 05:09:56 pm
Here's the original article:Only if you class nuclear as "zero carbon".
"Zero-carbon electricity outstrips fossil fuels in Britain across 2019"
https://www.theguardian.com/business/2020/jan/01/zero-carbon-energy-outstrips-fossil-fuels-in-britain-across-2019?CMP=Share_AndroidApp_Copy_to_clipboard
Maybe zero carbon at the point of generation, but how much carbon involved in mining and processing the uranium, then disposing and storing it afterwards.
The figures used at the website I linked to above are:
12g/kWh for nuclear.
11g/kWh for wind.
45g/kWh for solar PV.
230g/kWh for biomass.
490g/kWh for gas.
820g/kWh for coal.
I'd say the first three are effectively zero, given the relatively high values for the others.
Post by: Cudzoziemiec on 09 January, 2020, 07:06:32 pm
Post by: simonp on 09 January, 2020, 07:23:25 pm
My son's doing his maths homework. What's that got to do with electricity generation? He's using a calculator which is powered solely by a PV panel. Presumably it has some sort of rechargeable battery, capacitor or other storage device, but there's no external source of power. And when I bought it for him (four or five years ago), all calculators were like this. Whereas when I was at school, a few calculators had solar panels but they were just additional to a battery. An indication of how much more efficient PV has become. (They are also much cheaper than when I was at school, but that's presumably down to China.)
It's not just PV that has become more efficient - you can have way more processing power per Watt now than in the past, so you can have a much more functional device on very limited power.
Post by: Cudzoziemiec on 09 January, 2020, 07:45:05 pm
Post by: rob on 10 January, 2020, 03:43:55 pm
Post by: Kim on 10 January, 2020, 03:53:46 pm
That makes sense. Presumably that would also be a factor (along with Far Eastern mass manufacturing and increased global demand) why items like this are so much cheaper than 30-odd years ago?
Except when they conspicuously aren't. I'd previously noticed that the development of calculators seemed to have stagnated in the late 90s (which sort-of makes sense, in a world with ubiquitous fully-functional desktop/pocket computers, the niche for physical calculators is basically the extreme low-end, and exam/classroom-legality).
Not having experience of the USAnian edumacation system, I didn't realise that this was going on, though:
https://gen.medium.com/big-calculator-how-texas-instruments-monopolized-math-class-67ee165045dc
(As for the shift to solar for calculators, I suspect that's more about low-power electronics and avoiding the cost or shipping/shelf-life issues of batteries than developments in photovoltaics. They're hardly cutting-edge stuff. My first calculator in about 1987 was a purely solar-powered four-banger, though the scientific ones we had at secondary school mostly ran on lithium cells (occasional dual-power model), and programmable/graphing calculators ate AAAs[1].)
[1] I recall a mathmo friend draining the batteries in a couple of hours trying to get it to render the Mandelbrot set.
Post by: Cudzoziemiec on 10 January, 2020, 04:25:05 pm
The late 90s was a different world. By then we had all sorts of stuff like mobile phones and email squeezy-powered torches which were just sci-fi in the early 80s (even if they did actually really exist).
Post by: ian on 10 January, 2020, 04:32:32 pm
I confess that I never bought any books at university, which is why I'm as clever as I am.
I seem to recall our school recommended a Casio something or other. I'm sure it was solar-powered. Had a mysterious RAD feature which turned out to be less than billed.
Post by: rob on 10 January, 2020, 04:55:39 pm
Post by: Kim on 10 January, 2020, 05:21:14 pm
Brizzle University (or at least the engineering faculty) had a list of authorised models, and I promptly invested in the most functional model on the list. (The only real benefits over a typical scientific model were a one-line edit history, which was a useful error-check, and numerical integration, which was much less useful than it sounds.)
I vaguely recall that UKC issued all first years CS student with their exam-legal model which they bought in bulk at a hefty discount. I didn't get one, as I went straight into the second year, but the Brizzle one was fine.
My CFX9850 has barely been used since uni. I've probably dusted it off a couple of times as a convenient out-of-band way of converting between binary, decimal and hex, but I've forgotten how to do anything clever with it.
Post by: Frank9755 on 14 January, 2020, 11:34:27 am
Not having experience of the USAnian edumacation system, I didn't realise that this was going on, though:
https://gen.medium.com/big-calculator-how-texas-instruments-monopolized-math-class-67ee165045dc
That's terrible.
The nearest equivalent that I recall is the HP 12c calculators which were required use by people who worked at Bain, the management consulting firm, but were basically big chunks of weird American kit that nobody else could work out how to use.
Post by: Greenbank on 14 January, 2020, 11:50:19 am
University didn't allow anything that could draw graphs so it was a generic Casio FX-mumble. I still have it somewhere but, like most things like this, my 10yo squirrels it away for herself in her room.
Post by: rob on 14 January, 2020, 11:53:44 am
Not having experience of the USAnian edumacation system, I didn't realise that this was going on, though:
https://gen.medium.com/big-calculator-how-texas-instruments-monopolized-math-class-67ee165045dc
That's terrible.
The nearest equivalent that I recall is the HP 12c calculators which were required use by people who worked at Bain, the management consulting firm, but were basically big chunks of weird American kit that nobody else could work out how to use.
I still see those on desks of colleagues who came from US offices or companies. No idea how they work.
Post by: ian on 14 January, 2020, 11:55:54 am
Where it hit the deputy-head, appropriately, on the head. The calculator didn't break and the teacher lived to issue stern words about tossing stuff out the window.
Post by: Jaded on 14 January, 2020, 12:29:01 pm
It does metric to Imperial conversion too!
Post by: Wowbagger on 14 January, 2020, 12:36:45 pm
Post by: Frank9755 on 14 January, 2020, 12:56:24 pm
I had a Sinclair Programmable calculator at one time - 1970s I think it was. Quite fun for a while. I recall programming ti to churn out the Fibonacci sequence, but the buttons were susceptible to conking out. They were "clicky" buttons, unlike the much more reliable "soft" buttons that more modern calculators have.
Clicking calcluator buttons! That takes me back. At one point that was a very important issue. People lost sleep over whether their new calculator would be allowed in exams on noise grounds.
IIRC Casios had lovely soft buttons and Texas Instruments were clicky and clunky
Post by: Kim on 14 January, 2020, 01:57:35 pm
To be fair, for the period in the early noughties between laptop computers becoming affordable to students and their battery life being vaguely decent, they pretty much got it right.
Post by: Wowbagger on 14 January, 2020, 02:04:23 pm
We also had a dial-up connection to a computer. it was via pulse dialling. You had to put the receiver in a special cradle so that our terminal could talk to the computer, which I think was in Preston Polytechnic, or it might have been Lancaster Uni. i found that telephone very useful for making calls on. It had a little lock on the dial, but I knew where the key was...
Post by: Greenbank on 14 January, 2020, 02:07:18 pm
It display was incandescent wires, each decimal place having enough wires to generate all 10 digits.
Nixie tubes: https://www.youtube.com/watch?v=wxL4ElboiuA
Post by: Cudzoziemiec on 14 January, 2020, 02:14:54 pm
*Makes them almost sound like a Motown girl group.
Post by: Cudzoziemiec on 14 January, 2020, 02:18:54 pm
(Modern TVs must also consume less electricity than their CRT ancestors, but this might be offset by the additional energy and resources used in making them and transporting them, due to their size, and the additional time we spend watching them. Which is also time we spend not doing other things with other people.)
Post by: Kim on 14 January, 2020, 02:26:18 pm
Modern TVs must also consume less electricity than their CRT ancestors, but this might be offset by the additional energy and resources used in making them and transporting them, due to their size, and the additional time we spend watching them. Which is also time we spend not doing other things with other people.
Ignoring plasma as a temporary aberration (those things were basically convection heaters), for television (rather than computer monitors, which have generally remained fits-sensibly-on-your-desk size) I reckon it's a case of what LCD giveth, screen area taketh away.
Of course we spend a lot less time watching telly than we did in the CRT area, but many of the activities that have displaced it involve similar amounts of electricity consumption.
Post by: Cudzoziemiec on 14 January, 2020, 02:35:13 pm
Post by: sojournermike on 14 January, 2020, 02:37:00 pm
https://www.ebay.co.uk/i/113700515681?chn=ps&norover=1&mkevt=1&mkrid=710-134428-41853-0&mkcid=2&itemid=113700515681&targetid=910044633967&device=c&mktype=pla&googleloc=1006766&poi=&campaignid=1669190336&mkgroupid=88374263757&rlsatarget=pla-910044633967&abcId=578896&merchantid=113601272&gclid=EAIaIQobChMI4r7yq6eD5wIVh63tCh0uiw1eEAQYBSABEgLRZ_D_BwE (https://www.ebay.co.uk/i/113700515681?chn=ps&norover=1&mkevt=1&mkrid=710-134428-41853-0&mkcid=2&itemid=113700515681&targetid=910044633967&device=c&mktype=pla&googleloc=1006766&poi=&campaignid=1669190336&mkgroupid=88374263757&rlsatarget=pla-910044633967&abcId=578896&merchantid=113601272&gclid=EAIaIQobChMI4r7yq6eD5wIVh63tCh0uiw1eEAQYBSABEgLRZ_D_BwE)
The interesting feature, which made it dual purpose, was that it had a Vacuum Fluorescent Display. Not only can it do 'hard sums', but also you can hide under your blankets at night and read books by its gentle glow - long after your parents believe you should be asleep.
Given my -9 optical prescription, I have always encouraged my own children to keep their lights on when they want to read. As a consequence they seem to drop off much later than I do these days, but I ope they will have better vision than I had prior to my cataract replacement.
Post by: Kim on 14 January, 2020, 02:45:04 pm
I doubt if we spend less time telly watching now. There are so many ways to watch it! Not just cable and satellite but things like Netflix and Prime. And then there are those things like Wii, which use a TV screen but aren't TV.
https://www.statista.com/statistics/269918/daily-tv-viewing-time-in-the-uk-by-age/
I'd like to see a longer term graph. I remember routinely watching television out of boredom as a child. Haven't done that since The Great Our-Favourite-Teclo Dispute of 2007. I watch plenty of video, be it films, or YouTube or even occasionally live broadcast television, but since it competes with general spodding, the Wikipedia random article button and indeed gaming, it tends to be something I'm actively choosing to watch. It's massively easier to find something worth watching these days, but I find myself watching less and less.
OTOH, there are plenty of people, probably increasingly older demographics, who still use television[1] as wallpaper.
[1] Using radio as wallpaper is obviously completely different(!) and not something the middle classes tend to get snobby about.
Post by: orienteer on 14 January, 2020, 02:45:19 pm
Post by: Tim Hall on 14 January, 2020, 03:31:19 pm
Jurek knows about those I think.It display was incandescent wires, each decimal place having enough wires to generate all 10 digits.
Nixie tubes: https://www.youtube.com/watch?v=wxL4ElboiuA
Post by: Cudzoziemiec on 14 January, 2020, 03:51:37 pm
All I can see of that graph is a fairly level purple (might be blue to you ;)) line at the top and a big splodge asking me to pay "only $59 a month". I'll just take your word for it. :DI doubt if we spend less time telly watching now. There are so many ways to watch it! Not just cable and satellite but things like Netflix and Prime. And then there are those things like Wii, which use a TV screen but aren't TV.
https://www.statista.com/statistics/269918/daily-tv-viewing-time-in-the-uk-by-age/
I'd like to see a longer term graph.
Post by: pcolbeck on 14 January, 2020, 04:15:17 pm
Back to calculators, when I was at school I had a Casio fx-39
https://www.ebay.co.uk/i/113700515681?chn=ps&norover=1&mkevt=1&mkrid=710-134428-41853-0&mkcid=2&itemid=113700515681&targetid=910044633967&device=c&mktype=pla&googleloc=1006766&poi=&campaignid=1669190336&mkgroupid=88374263757&rlsatarget=pla-910044633967&abcId=578896&merchantid=113601272&gclid=EAIaIQobChMI4r7yq6eD5wIVh63tCh0uiw1eEAQYBSABEgLRZ_D_BwE (https://www.ebay.co.uk/i/113700515681?chn=ps&norover=1&mkevt=1&mkrid=710-134428-41853-0&mkcid=2&itemid=113700515681&targetid=910044633967&device=c&mktype=pla&googleloc=1006766&poi=&campaignid=1669190336&mkgroupid=88374263757&rlsatarget=pla-910044633967&abcId=578896&merchantid=113601272&gclid=EAIaIQobChMI4r7yq6eD5wIVh63tCh0uiw1eEAQYBSABEgLRZ_D_BwE)
That was the weapon of choice for maths when I was at school as well. We all traded in our slide rules for one of those.
For A-level maths I was bought a Sharp EL-506P which I had for about twenty years before it died.
https://www.ebay.co.uk/itm/Vintage-Sharp-Calculator-EL-506P/143500736825?hash=item21694f7939:g:Dt0AAOSwDUJc~m95
Post by: Wowbagger on 14 January, 2020, 06:20:20 pm
That's them!It display was incandescent wires, each decimal place having enough wires to generate all 10 digits.
Nixie tubes: https://www.youtube.com/watch?v=wxL4ElboiuA
Post by: rob on 28 January, 2020, 08:52:08 am
Peak system demand 10years ago was 59.5GW. This Winter's looks like it is going to be sub 45GW.