Alex1Powell's Categories

Alex1Powell's Authors

Latest Saves

China's Ultra-High Voltage Lines - Thread

1/14

China is building the world's most advanced UHV grid right now.

UHV lines are good for carrying power over long distances. The high voltage level reduces line loss. But they are very expensive to build.

China's UHVDC Network now:


2/14
In the rest of the world, UHV lines have generally been used sparingly. Submarine power cables (e.g. connecting UK to mainland Europe) and some huge hydropower projects in Quebec are some notable exceptions.

China is building UHV lines on a scale never seen before.

3/14
So why is China different? Geography plays a huge role. China's load centers are in the coastal East and South, while the best wind, solar, and hydro resources are in the North, Northwest, and Southwest. Power (esp. RE) is being generated far from where it's needed most.

4/14

In the past, poor regional interconnectivity has been a big contributor to low offtake levels of renewable energy. Of course a glut of coal power also played a role. Curtailment has improved in recent yrs tho. I discussed regional grids before:


5/14
UHV lines provide a inter-region backbone to transport power hundreds or thousands of km across the country. The UHVDC lines are used for the longest distances, while UHVAC lines are used for shorter distances, often within the same regional grid.

China's UHVAC lines now:
https://t.co/3XLYTgAnSV via @yumpu_com
#Moduloft The Concept. #Cop26 Draft No.1 Presentation and discussion #BuildBackBetter #LevellingUp


https://t.co/83Lcp66ySk
#Moduloft #AffordableHousingFinance #TheBestMove
Affordable Homes, Are we Looking for a Solution? If so heres where to look!


https://t.co/TFmLjdJWF8 via @yumpu_com Affordable Homes, Are we Looking for a Solution? If so heres where to look! #Moduloft #AffordableHousingFinance #TheBestMove

https://t.co/YUGr2H0HGl
Affordable Homes, Are we Looking for a Solution? If so heres where to look! #Moduloft #AffordableHousingFinance #TheBestMove

https://t.co/qhAB3TOQHo
Affordable Homes, Are we Looking for a Solution? If so heres where to look! #Moduloft #AffordableHousingFinance #TheBestMove
Good to see @Marthakearney on @BBCr4today taking @pritipatel to task over the numbers of lorries in Dover - now 1,500 in Stack (M20) and Manston airfield combined - rather more than 170 that @BorisJohnson said yesterday, baffling haulage groups /1

@BBCr4today @pritipatel @BorisJohnson She won't say whether lorry drivers will have to take a PCR test (long-winded, requires RNA extraction etc. 24-48hrs) rather than much faster (and less sensitive) lateral flow test. Short Strait will struggle to operates with PCR tests. You'd need one yesterday for tomorrow! /2

@BBCr4today @pritipatel @BorisJohnson Because of the delays that have empty lorries already stuck in the queues, in an earlier interview British Retail Consortium @the_brc Andrew Opie said fresh food shortages would occur within days because lorries couldn't get back to Spain etc to reload /3

@BBCr4today @pritipatel @BorisJohnson @the_brc Haulage experts like @RHADuncanB are always at pains to explain that the lorries at Dover (and GB-IE, for that matter) are flowing in a continuous cycle. More than 85% are from EU countries. So if you block one side, or artery the whole system starts to grind to a halt/4

@BBCr4today @pritipatel @BorisJohnson @the_brc @RHADuncanB This episode has been a bit of a teaching moment, exposing the canard that the UK can unilaterally "take back control of its borders". It can't. Borders are membranes. Traffic flows in both directions. Actions by one side impact the other - as French move has demonstrated. /5
From the Middle of the Night File, up again after a few hours decent sleep, I was doing some organizing for tomorrow's thread. And what do I find? Once again Twitter has broken one of my threads. Yesterday morning's. It was a 4-tweet thread. I can only see 27 tweets.


2) I don't know what I'm going to do about it. That's a bridge too far. If I didn't have the thread reader app unroll above, I'd be checking my memory of my work. Thank goodness at least that's there!

45 - 27 = 18

Twitter disappeared 18 of my tweets. And they're not random.

3) At the same time, look what I find in my feed. Two announcements composed in identical format. I'll point out what's wrong with these "clarifications" below. This is from


4) And this from


5) Isn't it interesting that both clarifications follow the exact same series of questions and answers? Obviously this is from the legal department, as if it were information to be shared. It is not. It is very, very carefully NOT information. Focus on that.
Retracted, with a note that says "we believe that all the key findings of the paper with regards to co-authorship between junior and senior researchers are still valid". Isn't it important to discuss the many points on which the paper is incorrect?


1. The gender analysis was "only meant to be exploratory” and used techniques that “cannot be claimed to establish causality” but causal inferences were made anyway.

Causal claims were justified by pointing out that other people do it too. "While this technique does not establish the existence of a causal effect, it is commonly used to infer causality from observational data."