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Kees van der Leun  Profile picture
@Sustainable2050
Oct 2, 2020 • 9 tweets • 3 min read • Read on X
450 mm of rain expected in SE France; 270 mm already fell in one place.
.. already resulting in river flooding and damage. Was that flash caused by a power cable in the bridge?
417 mm of rain recorded within 24 hours at one station in Alpes-Maritimes, north of Nice!
That's half a year's worth in the Netherlands.
Up to 500 mm (20 inches) of rain in 12 hours in SE-France, and 630 mm (25 inches) in 24 hours in Italy's adjacent Piedmont region. Two dead, 24 missing. abcnews.go.com/amp/Internatio…
And this from the neighboring part of Italy.
More on the damage in Italy, where water levels in the Po river rose by 3 meters within 24 hours. repubblica.it/cronaca/2020/1…
You understand the destructive power of such extreme rainfall events when you realize that 500 mm of rain means 0.5 meter:

0.5 tonne of water on every m²
3,000 tonnes on a football field
500,000 tonnes per km²

All on its way down in 24 hours.
And all that rushing water takes a lot of soil with it; sediment ending up in the Mediterranean Sea now.

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More from @Sustainable2050

Kees van der Leun  Profile picture
Mar 16
Starting a week-long business & pleasure trip to Spain, by train!
Hope to be in Barcelona this evening :)
I'll keep you posted in this🧵 Image
The plan for today: Utrecht - Rotterdam - Paris - Barcelona. The tricky part is changing trains in Paris. Theoretically 2 hours should be more than enough to get from Paris-Nord to Gare de Lyon (the rail planner irresponsibly proposed 1 hour), but @Eurostar is often delayed (2/n) Image
Made it to Rotterdam, at least ;)
Bit very early, but hey, why hurry on a Saturday morning? (3/n)
Image
Image
Read 69 tweets
Kees van der Leun  Profile picture
Jan 28
Reading the Dutch "Action agenda congestion low-voltage grids".
The accelating energy transition already brings grid issues here. In the low-voltage distribution grid, the growing number of solar panels (PV), electric cars (EV) and (hybrid) heat pumps ((h)WP) is the challenge. Image
Without measures, a large and growing number of households would experience periods with too high or too low voltage (over- resp. onderspanning) or risk of grid failure. Image
Measures are categorized in:
1) accelerating grid expansion
2) more efficient use of the grid capacity
3) saving energy as much as possible.

1) already gets a lot of attention, and each of the three main DSOs plans to spend around €1 billion/year. Many hurdles though.
Read 16 tweets
Kees van der Leun  Profile picture
Nov 14, 2023
"Transition doesn't make energy cheaper, but to the contrary, significantly more expensive"
Headline in Dutch @Volkskrant yesterday, 9 days before the elections here. "Consumers and companies will pay 92% more for electricity and natural gas by 2030".
Hmm, let's look into that. Image
Firstly, as others have already pointed out too, it's a comparison between 2020 and 2030. In 2020, energy was cheap: Covid reduced demand, and Russia hadn't started its energy war and attack on Ukraine yet.
Compared with 2023, not a lot would remain of the "+92%". Image
Looking into the forecasted price increase 2020-2030 it has three components:
1. Tax (Belasting) +€5 billion. That'd be a political choice, which has little to do with the energy transition.
2. Grid (Netbeheer) +€5 billion. Increase to be expected indeed.
But ... Image
Read 17 tweets
Kees van der Leun  Profile picture
Oct 7, 2023
Today it's Scotland.
#ClimatechangeisWaterchange
Install bigger pumps. Oh, and reduce emissions to zero, asap.
Seems like the right decision.
(West of Glasgow, Scotland)
Read 4 tweets
Kees van der Leun  Profile picture
Sep 24, 2023
A problem for French nuclear power producer EDF: its total production cost (in the old power plants) is 60 €/MWh, according to the regulator, but govt forces it to sell a big chunk at 42 €/MWh.
60 €/MWh is not a bad cost in the current European electricity market, but it's also a reality check for those here who think nuclear power is practically for free after the investment in the power plant is done.
Read 4 tweets
Kees van der Leun  Profile picture
May 23, 2023
Tomorrow, @KornelisBlok's 40+ years of wide-ranging, thorough, and groundbreaking work on the energy transition will come together in his "Need for Speed" lecture. Recommended!
Time: 15:00 CEST
Link: lnkd.in/e6hbsKQc
#energytransition #tudelft
Time to tune in! Image
.@KornelisBlok's 1984 analysis of 100% renewable energy for the Netherlands! Including heat pumps and electrolysis. Image
Read 5 tweets

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