Sign in

Kornelis Blok

@kornelis.bsky.social
3K followers 1.6K following 120 posts

Speeding up the energy transition Professor Energy Systems @TU-Delft Lead author @IPCC @UNEP Gap Report Chairman Technical Council @SBTi Scientific Climate Council @NL Energy coach @Houten #energysky #climatesky www.kornelis.blog

PostsRepliesMedia
Reposted by Kornelis Blok
Reinier van den Berg @reiniervdberg.bsky.social · 25/09/2026
Ook vanochtend zagen we, nu vooral boven de westelijke helft van NL, weer bakken vol met vliegtuigbewolking (contrails). Die hebben netto een even sterk opwarmend effect als de uitstoot van CO2 door luchtvaart, maar zijn (als men wil) veel makkelijker te voorkomen. Zie: lnkd.in/p/echcQJpa
1514767
Kornelis Blok @kornelis.bsky.social · 19/08/2026
Important article on the vulnerability of the U.S. power grid (and probably of power systems elsewhere): transformers are the weak link. Gift article: www.nytimes.com/2026/08/18/m...
nytimes.com
The Blackout That Could Devastate America (Gift Article)
The power grid relies on thousands of aging, hand-built transformers. If enough fail, the blackout could last years.
021
Reposted by Kornelis Blok
Justin Gerdes @justingerdes.bsky.social · 22/05/2026
"Collectively, these projects presage a future when the sunniest, most remote places in the world serve as electrical breadbaskets, supplying energy to population hubs far away," writes Julian Spector: www.canarymedia.com/articles/sol... 🔌💡
canarymedia.com
How big can solar go? These 3 projects show us the gigascale future
A handful of sensationally large developments are underway around the world, testing just how big solar can get.
1125
Reposted by Kornelis Blok
TerraWatts2010 @terrawatts2010.bsky.social · 02/04/2026
With solar, “you can make a major dent on your fossil fuel reliance in a matter of a couple of years,” Lauri Myllyvirta, the research center’s lead analyst, told me. 🔌💡 www.nytimes.com/2026/04/01/o...
nytimes.com
Opinion | Remember the Oil Shocks of the ’70s? This Is Going to Be Worse. Much Worse.
076
Reposted by Kornelis Blok
Kees van der Leun @sustainable2050.bsky.social · 24/03/2026
Global oil supply hit by US-Israeli war against Iran. Oil and gasoline prices up. And... of course some parties in Dutch parliament now ask for (tax) subsidies to keep demand high. President of Central bank DNB: Don't do this! Aim financial support at lower incomes. nos.nl/l/2607642
nos.nl
Druk op kabinet neemt toe, Kamer wil maatregelen tegen hoge prijzen
Morgen is er een debat over de economische gevolgen van de oorlog in het Midden-Oosten.
0104
Kornelis Blok @kornelis.bsky.social · 05/03/2026
No interest from oil companies for new exploration in Alaska Explore this gift article from The New York Times. You can read it for free without a subscription. www.nytimes.com/2026/03/04/c...
nytimes.com
Trump’s High-Profile Oil and Gas Lease Sale in Alaska Has No Takers
132
Reposted by Kornelis Blok
Katharine Hayhoe @katharinehayhoe.com · 13/02/2026
Bluesky is the new science Twitter, new study by @whysharksmatter.bsky.social and Julia Wester concludes! "Results show that for every reported professional benefit that scientists once gained from Twitter, scientists can now gain that benefit more effectively on Bluesky than on Twitter."
academic.oup.com
Scientists no Longer Find Twitter Professionally Useful, and have Switched to Bluesky
Synopsis. Social media has become widely used by the scientific community for a variety of professional uses, including networking and public outreach. For
9667912210
Kornelis Blok @kornelis.bsky.social · 12/02/2026
Anyone interested? Proceedings of probably the first IEA seminar on energy and climate change, 1989. Two volumes, over 1000 pages.
232
Reposted by Kornelis Blok
Henk Nieboer @henknieboer.bsky.social · 01/01/2026
In 2013 was dit 10%. In 12 jaar van 10% naar 57% is een hele prestatie (totstandkoming processen van grote projecten duren soms decennia). En al die tijd werd dit harde werken begeleid door een koor van opiniemakers, journalisten en politici die beweerden dat 'er niets gebeurde'.
194
Reposted by Kornelis Blok
Kees van der Leun @sustainable2050.bsky.social · 03/12/2025
Kom bij ons werken! We zoeken nieuwe collega's bij Common Futures; werk mee aan mooie projecten om de energietransitie te versnellen. www.commonfutures.com/nl/vacatures (We're hiring; in Dutch ;)
commonfutures.com
Vacatures
Vacatures
065
Reposted by Kornelis Blok
Lauri Myllyvirta @laurimyllyvirta.bsky.social · 04/12/2025
Our annual deep dive on China’s climate transition is out! China’s CO₂ emissions are set to remain flat for a second year in 2025. Record additions of solar and wind, accelerating electrification, and declining construction-material demand are the main drivers.
35825
Reposted by Kornelis Blok
European University Association (EUA) @eua.eu · 26/11/2025
Can universities lead on clean technologies?🌱⚡Join the next webinar in EUA’s ‘Spotlight on Sustainability’ series. 📅 09 Dec 2025 | 10.30 CET 🔗 Registrations will remain open until the webinar starts at bit.ly/3XcQ6hp 🗣️ Carlos Härtel, Stella Tsani, @kornelis.bsky.social
Promotional image for a webinar titled "Technological innovation – universities' role and dilemmas in sustainability", scheduled for 9 December 2025. The event is part of the EUA webinar series on sustainability. The background shows a blurred image of trees, emphasizing the theme of sustainability.
001
Reposted by Kornelis Blok
Glen Peters @glenpeters.bsky.social · 25/11/2025
The costs of Direct Air Capture will not fall as much as hoped. "Efforts to reduce carbon emissions should therefore* continue at pace, says the research team." *Therefore is problematic here, as it implies that if DACCS was cheap less reductions are needed. No, no, no. ethz.ch/en/news-and-... 1/
66720
Reposted by Kornelis Blok
Chris Bataille @chrisbataille.bsky.social · 21/11/2025
I’m really surprised this isn’t bigger news. Just under 10 million people live in Tehran. Where can they go? Where else in Iran will have enough water? This will undoubtedly strain the country’s and the region’s politics, finances and governance capacity.
9174114
Reposted by Kornelis Blok
European University Association (EUA) @eua.eu · 11/11/2025
Can universities lead on clean technologies?🌱⚡Join the next webinar in EUA’s ‘Spotlight on Sustainability’ series. 📅 09 Dec 2025 | 10.30 CET 🔗 Registrations will remain open until the webinar starts at bit.ly/3XcQ6hp 🗣️ Carlos Härtel, Stella Tsani, @kornelis.bsky.social
Promotional image for a webinar titled "Technological innovation – universities' role and dilemmas in sustainability", scheduled for 9 December 2025. The event is part of the EUA webinar series on sustainability. The background shows a blurred image of trees, emphasizing the theme of sustainability.
011
Reposted by Kornelis Blok
Chris Baraniuk @chrisbaraniuk.com · 13/11/2025
NEW: I wrote about British churches installing heat pumps, in some cases in 1,000-year-old buildings! Decarbonisation may not be easy, but many view it as an act of faith. This is a special feature to mark The Reengineer’s first anniversary! Spread the word! 🥳 www.thereengineer.pro/p/let-there-...
thereengineer.pro
Let there be warmth! The British churches putting their faith in heat pumps
Ancient buildings and old bones aren’t getting in the way of decarbonisation
1017957
Reposted by Kornelis Blok
Martien Visser @bmvisser.bsky.social · 11/11/2025
Een gem. huishouden betaalt nu €1000/jr meer voor energie dan 5 jaar geleden; en nog in veelvoud indirect via inflatie. #grafiekvandedag De stijging (+ inflatie) wordt mogelijk flink groter; ook voor 'gas-loos'. Zie mijn (gratis) column vandaag op Energiepodium. www.energiepodium.nl/artikel/onze...
4257
Kornelis Blok @kornelis.bsky.social · 08/11/2025
Very nice visualisation 👇 The fact the 75% can be electrified, doesn't mean that 75% of final energy use will be electricity. Electrification leads to a reduction of final energy use, typically by a factor 2,5 - 4. The share of electricity will then probably end up around 50%.
22310
Kornelis Blok @kornelis.bsky.social · 07/11/2025
Science-Based Targets initiative has published a 2nd consultation draft of the new Corporate Net-Zero Standard. This is a core document in the family of standards. Any comments welcome! sciencebasedtargets.org/consultation...
sciencebasedtargets.org
Corporate Net-Zero Standard V2 Second Public Consultation
Explore the second draft of the Corporate Net-Zero Standard V2 with our digital consultation guide.
010
Reposted by Kornelis Blok
James Murray @james-bg.bsky.social · 03/11/2025
Lots of anti-net zero noise, but a major new report from SBTI shows the number of companies with net zero targets has surged and those with goals in place are reporting multiple financial, operational, and reputational benefits. www.businessgreen.com/news/4521250...
businessgreen.com
SBTi: Number of firms with net zero goals triples in 18 months
Poll of leading corporates finds vast majority are enjoying reputational and financial benefits from having a validated emissions target in place
14216
Kornelis Blok @kornelis.bsky.social · 16/10/2025
"Keeping global temperature rise below 2 degree ˚C is surely feasible". Interview related to the next IPCC report (in Dutch). www.change.inc/klimaatveran...
change.inc
Prof. Blok met honderden wetenschappers begonnen aan nieuw IPCC-klimaatrapport: ‘2 graden opwarming nog steeds haalbaar’ - Change Inc.
Het klimaatdoel van 1,5 graad opwarming gaat de wereld niet meer halen, maar 2 graden is nog steeds mogelijk, betoogt Em. Prof. Dr. Kornelis Blok. De komende drie jaar is hij voor de vierde keer hoofd...
021
Reposted by Kornelis Blok
Scientific American @sciam.bsky.social · 14/10/2025
A famous graphic, now updated, compares locomotion in the animal kingdom
scientificamerican.com
The Most Efficient Traveler Isn’t a Bird or a Fish—It’s You on a Bike
A famous graphic, now updated, compares locomotion in the animal kingdom
29832
Reposted by Kornelis Blok
Reuters @reuters.com · 03/10/2025
Indonesia starts construction of 92 megawatt floating solar plant reut.rs/4pXLGbI
reut.rs
Indonesia starts construction of 92 megawatt floating solar plant
Indonesia's state utility firm Perusahaan Listrik Negara (PLN) has started constructing a 92-megawatt-peak floating solar power plant in the West Java province as part of the country's renewable energy drive, it said on Friday.
14420
Reposted by Kornelis Blok
Chris Bataille @chrisbataille.bsky.social · 30/09/2025
I'd wager anyone in that room is more qualified to be Secretary of Defence, and better understands the threat multiplier implications of climate change. Security think tanks have been thinking about it since the 1970s, & the Pentagon formally since the 1990s.
172
Reposted by Kornelis Blok
Glen Peters @glenpeters.bsky.social · 29/09/2025
Some of the most interesting trends in electric car sales are in developing countries, here Indonesia. When price parity is reached & energy security is a concern, EVs will take off in the developing world. Check some charts here (mainly developed countries) robbieandrew.github.io/carsales/
Indonesia is up to 20% new car sales are EVs, in the space of a few years...
48131
Kornelis Blok @kornelis.bsky.social · 25/09/2025
Balanced perspective on solar geo-engineering: by @hausfath.bsky.social, www.nytimes.com/2025/09/21/o...
nytimes.com
Opinion | Turns Out Air Pollution Was Good for Something
120
Reposted by Kornelis Blok
Lauri Myllyvirta @laurimyllyvirta.bsky.social · 24/09/2025
Xi Jinping announced China's new climate targets personally, a positive gesture, but the targets brought little clarity on China’s future emission pathway. Targeting a 7-10% emission reduction by 2035 from an undefined "peak level" undersells China's current clean energy boom.
414446
Kornelis Blok @kornelis.bsky.social · 24/09/2025
Important message from Xi 👇 Hopefully they "will do - a lot - better".
040
Reposted by Kornelis Blok
Lauri Myllyvirta @laurimyllyvirta.bsky.social · 24/09/2025
The basic dilemma for China's leaders is: you have to cut either the clean energy industry or the coal industry down to size; both can't continue to grow like they have. These targets just show they still haven't made up their minds, balking at the economic fallout from either.
24210
Kornelis Blok @kornelis.bsky.social · 24/09/2025
Natural gas imported from the US to the Netherlands causes 40% higher greenhouse gas emissions than the gas we used to extract from the Groningen field. Contribution to the "Climate Helpdesk" (in Dutch): www.klimaathelpdesk.org/answers/wat-...
klimaathelpdesk.org
Wat is de extra klimaatimpact als we gas uit de Verenigde Staten gebruiken in plaats van gas uit Groningen?
Als we aardgas uit de Verenigde Staten importeren, wordt de uitstoot van broeikasgassen hoger. Dat heeft twee redenen. Ten eerste komt in de Verenigde Staten bij de winning en het transport van aardga...
030
Kornelis Blok @kornelis.bsky.social · 24/09/2025
"The world isn't slowing down on climate". I think EU Commissioner Hoekstra is right and that is good news. The bad news is that we are not accelerating. www.nytimes.com/2025/09/24/c...
nytimes.com
Despite Trump, the World Isn’t Slowing on Climate, E.U. Official Says
061
Reposted by Kornelis Blok
Alaina Wood @thegarbagequeen.bsky.social · 23/09/2025
I keep telling y’all that your voice and wallet are more powerful than you think, so maybe we should stop listening to the doomers and accelerationists who think things are hopeless — because things are only hopeless if we all give up.
929080
Kornelis Blok @kornelis.bsky.social · 23/09/2025
👇 Thread on "the most significant climate announcement of the year"
032
Reposted by Kornelis Blok
Christian Breyer @christianonre.bsky.social · 27/08/2025
Podcast on Feasibility of 100% Renewable Energy Systems youtu.be/GXadcmYfWGY for this paper from 2018 doi.org/10.1016/j.rs... @lut.fi @nworbmot.bsky.social @kornelis.bsky.social @brianvad.bsky.social
youtu.be
Feasibility of 100% Renewable Energy Systems
YouTube video by Christian Breyer
042
Kornelis Blok @kornelis.bsky.social · 30/07/2025
The 1.5˚C target remains a critical objective - even if we are on the way to exceed it. Important paper by Rogelj and Rajamani: www.science.org/doi/10.1126/...
071
Kornelis Blok @kornelis.bsky.social · 24/07/2025
Great thread on yesterdays ruling on climate by the International Court of Justice:
050
Reposted by Kornelis Blok
Thijs ten Brinck @wattisduurzaam.bsky.social · 21/07/2025
De kans op daadwerkelijke conversie van Powerpoints naar operationele waterstoffabrieken groeit. En dat werd tijd, dus dat is mooi. www.wattisduurzaam.nl/49462/energi...
wattisduurzaam.nl
Serieuze subsidie voor 602 MW aan groene waterstofproductie
De Rijksdienst voor Ondernemend Nederland (RVO) heeft ruim €700 mln subsidie toegekend aan 11 elektrolyseprojecten in Nederland. Als alle intenties tot een investeringsbeslissing komen, levert dat …
1107
Kornelis Blok @kornelis.bsky.social · 11/06/2025
Very good overview of the role of aerosols in (masking) global warming: www.carbonbrief.org/explainer-ho...
carbonbrief.org
Explainer: How human-caused aerosols are ‘masking’ global warming - Carbon Brief
Carbon Brief unpacks the climate effects of aerosols, how their emissions have changed over time and how they could impact the pace of future warming
040
Reposted by Kornelis Blok
Lauri Myllyvirta @laurimyllyvirta.bsky.social · 15/05/2025
NEW from me: China's CO2 emissions fell ~1.6% in the first quarter and have now been flat or down for more than a year. This is the first time on record that emissions are falling due to clean energy growth, not slow power demand.
8943327
Kornelis Blok @kornelis.bsky.social · 19/04/2025
So far, 2025 is a very warm year, despite the dissipation of El Nino. Data for March: berkeleyearth.org/march-2025-t...
0134
Reposted by Kornelis Blok
Glen Peters @glenpeters.bsky.social · 16/04/2025
Just your regular reminder of where global CO2 emissions are tracking compared to scenarios that keep warming to below 1.5C in 2100, with "no or low overshoot" (maximum temperature around 1.6C). journals.sagepub.com/doi/full/10.... C1/
16443248
Kornelis Blok @kornelis.bsky.social · 17/04/2025
How vulnerable are you to flooding and what can you do about it? Scientists develop "water label" for Dutch homes: www.tudelft.nl/en/2025/tbm/...
tudelft.nl
“Homeowners unaware of flood risks”: Why scientists are developing a water label for Dutch homes
From installing special window shutters and flood-protection valves to choosing floors that can take a splash: there are many things homeowners can do to prevent damage when the water comes. But in th...
020
Kornelis Blok @kornelis.bsky.social · 15/04/2025
Harvard’s Decision to Resist Trump Is ‘of Momentous Significance’ (gift article) www.nytimes.com/2025/04/14/u...
nytimes.com
Harvard’s Decision to Resist Trump Is ‘of Momentous Significance’ (Gift Article)
But a fight with the nation’s oldest, richest and most elite university is a battle that President Trump and his powerful aide, Stephen Miller, want to have.
040
Reposted by Kornelis Blok
Jesse D. Jenkins @jessedjenkins.com · 06/03/2025
“It took more than 20 years for the U.S. to install the first 100 GW of clean power, five years to install the next 100 GW, and three years to install the most recent 100 GW" cleanpower.org/news/market-... #Upshift 🔌💡
cleanpower.org
NEW REPORT: Clean Energy Dominates in 2024 | ACP
• 93% of new energy capacity that came online last year was solar, wind, and storage • 49 GW of clean energy installed in 2024 • Clean energy in the […]
15616
Reposted by Kornelis Blok
Eliot Higgins @eliothiggins.bsky.social · 28/02/2025
Polish Prime Minister Donald Tusk responds, something we hopefully see a lot more of that from other European leaders. It's never been clearer than in this moment that Trump is Putin's ally, not Europe's.
9199062075
Reposted by Kornelis Blok
Bluesky Wins @blueskywins.bsky.social · 27/02/2025
Already posted Kees before, but it's one account I've grown to like - needs a much bigger following here. Truly one of the best accounts on #EnergySky @sustainable2050.bsky.social
A screenshot of a Bluesky profile for Kees van der Leun. The profile banner features a scenic landscape with a flooded field, trees, and a wooden fence leading into the water. The profile picture is a headshot of Kees van der Leun, a middle-aged man wearing glasses and a suit. His bio states that he has 38 years of experience in energy transition and is building a consultancy called Common Futures. He posts about energy, climate, and Ukraine. The bio also mentions that he is on Mastodon and clarifies that reposts are not endorsements. His handle is @sustainable2050.bsky.social, and he has 7K followers, follows 660 accounts, and has made 1.3K posts. The profile includes the hashtag #EnergySky
2609
Reposted by Kornelis Blok
Christian Breyer @christianonre.bsky.social · 26/02/2025
TU Delft research suggests back contact tech may push crystalline silicon PV over 28% threshold www.pv-magazine.com/2025/02/24/t...
pv-magazine.com
TU Delft research suggests back contact tech may push crystalline silicon PV over 28% threshold
Researchers in the Netherlands have investigated how carrier-selective contacts may help achieve stronger performance in back-contact (BC) crystalline silicon solar cells and have predicted efficienci...
0124
Reposted by Kornelis Blok
Katharine Hayhoe @katharinehayhoe.com · 21/02/2025
‼️The US-based @ipcc.bsky.social technical support unit (TSU) for Working Group 3 Co-Chairs has been terminated, and the US won’t be attending next week’s IPCC meeting where the AR7 chapter outlines will be approved. More by @afreedma.bsky.social here:
axios.com
Scoop: U.S. delegation pulled from key U.N. climate science meeting
The IPCC meeting in China is slated to determine the content in the group's next series of reports.
43655482
Kornelis Blok @kornelis.bsky.social · 20/02/2025
Evaluation of our series of online courses "Designing a Climate-Neutral World": learners are very positive (scale from 0 tot 10) 👇
141
Reposted by Kornelis Blok
Prof Sebastian Geiger @geoenergyprof.bsky.social · 18/02/2025
Some truly excellent talks on energy transition, critical raw materials, climate change & water resources - and a much needed positive message on #CO2 emissions from @kornelis.bsky.social at the half-Lustrum event that our #geoscience & #mining student association at TU Delft hosted today.
A TU Delft Professor giving a lecture that explains why there is hope for reducing CO2 emissions even in 2925.
041