Alejandro Nuñez-Jimenez
@anunezjimenez.com
Senior Researcher in #energy innovation #policy @ ETH Zurich and Associate investigating #hydrogen @ Harvard Kennedy School. Co-founded YES Europe & ETH Energy Blog. Views mine.
Website -> https://anunezjimenez.com/
Website -> https://anunezjimenez.com/
Pinned
Energy supply security is key to the clean energy transition, but models sometimes overlook it.
Our new paper, in @cp-iscience.bsky.social with @empa-materials.bsky.social colleagues, introduces the ESS Pyramid, a hierarchical framework to assess and strengthen security in future energy systems 🔌💡
Our new paper, in @cp-iscience.bsky.social with @empa-materials.bsky.social colleagues, introduces the ESS Pyramid, a hierarchical framework to assess and strengthen security in future energy systems 🔌💡
🚨Call for Papers
Submissions now open for the ETH Academy on Sustainability & Technology: Energy Research in a Changing World
Guest faculty:
•Prof Inês Azevedo (Stanford)
•Prof Varun Rai (UT Austin)
🥸Junior scholars
📅31.05–05.06
📍Switzerland
Deadline: 13.03
Info: sustec.ethz.ch/teaching/phd...
Submissions now open for the ETH Academy on Sustainability & Technology: Energy Research in a Changing World
Guest faculty:
•Prof Inês Azevedo (Stanford)
•Prof Varun Rai (UT Austin)
🥸Junior scholars
📅31.05–05.06
📍Switzerland
Deadline: 13.03
Info: sustec.ethz.ch/teaching/phd...
ETH PhD Academy on Sustainability and Technology 2026
Energy Research in a Changing World
sustec.ethz.ch
February 9, 2026 at 4:02 PM
🚨Call for Papers
Submissions now open for the ETH Academy on Sustainability & Technology: Energy Research in a Changing World
Guest faculty:
•Prof Inês Azevedo (Stanford)
•Prof Varun Rai (UT Austin)
🥸Junior scholars
📅31.05–05.06
📍Switzerland
Deadline: 13.03
Info: sustec.ethz.ch/teaching/phd...
Submissions now open for the ETH Academy on Sustainability & Technology: Energy Research in a Changing World
Guest faculty:
•Prof Inês Azevedo (Stanford)
•Prof Varun Rai (UT Austin)
🥸Junior scholars
📅31.05–05.06
📍Switzerland
Deadline: 13.03
Info: sustec.ethz.ch/teaching/phd...
Reposted by Alejandro Nuñez-Jimenez
No joke: I got angry hate mail today for writing an obituary of a Black woman scientist—because the person felt she did didn’t deserve the recognition.
Which just makes me want to share it again: www.nature.com/articles/d41...
Which just makes me want to share it again: www.nature.com/articles/d41...
Gladys Mae West obituary: mathematician who pioneered GPS technology
She made key contributions to US cold-war science despite facing huge barriers as a Black woman.
www.nature.com
February 6, 2026 at 9:09 AM
No joke: I got angry hate mail today for writing an obituary of a Black woman scientist—because the person felt she did didn’t deserve the recognition.
Which just makes me want to share it again: www.nature.com/articles/d41...
Which just makes me want to share it again: www.nature.com/articles/d41...
Reposted by Alejandro Nuñez-Jimenez
I follow this stuff closely. I wrote about it a few months ago. I'm shocked how fast this is happening for big trucks.
"China’s rapid adoption of electric trucks — which overtook gas-powered vehicle sales for the first time last yea"
"China’s rapid adoption of electric trucks — which overtook gas-powered vehicle sales for the first time last yea"
January 28, 2026 at 6:07 PM
I follow this stuff closely. I wrote about it a few months ago. I'm shocked how fast this is happening for big trucks.
"China’s rapid adoption of electric trucks — which overtook gas-powered vehicle sales for the first time last yea"
"China’s rapid adoption of electric trucks — which overtook gas-powered vehicle sales for the first time last yea"
Reposted by Alejandro Nuñez-Jimenez
Announcing eurosky.social accounts - launching January 2026.
✅ Managed by Eurosky, a European non-profit initiative
✅ Hosted on European cloud
✅ Governed by European law
www.eurosky.social/register
✅ Managed by Eurosky, a European non-profit initiative
✅ Hosted on European cloud
✅ Governed by European law
www.eurosky.social/register
Register for a eurosky.social account - one web identity, dozens of apps — eurosky
www.eurosky.social
December 15, 2025 at 3:01 PM
Announcing eurosky.social accounts - launching January 2026.
✅ Managed by Eurosky, a European non-profit initiative
✅ Hosted on European cloud
✅ Governed by European law
www.eurosky.social/register
✅ Managed by Eurosky, a European non-profit initiative
✅ Hosted on European cloud
✅ Governed by European law
www.eurosky.social/register
Wow, that's pretty shocking! I just started reading "After the Spike: Population, Progress, and the Case for People" by Dean Spears and Michael Geruso, and it gives you a lot of food for thought on this topic.
January 20, 2026 at 11:02 AM
Wow, that's pretty shocking! I just started reading "After the Spike: Population, Progress, and the Case for People" by Dean Spears and Michael Geruso, and it gives you a lot of food for thought on this topic.
Tremendous view of Zurich!
January 16, 2026 at 4:10 PM
Tremendous view of Zurich!
Reposted by Alejandro Nuñez-Jimenez
Reposted by Alejandro Nuñez-Jimenez
The threat to German auto producers isn't from Chinese cars flooding Germany. It's from Chinese cars flooding to emerging markets (red), where they're killing the market for German cars. That's not something EU tariffs on China are going to be able to fix...
robinjbrooks.substack.com/p/chinas-inv...
robinjbrooks.substack.com/p/chinas-inv...
December 25, 2025 at 3:57 PM
The threat to German auto producers isn't from Chinese cars flooding Germany. It's from Chinese cars flooding to emerging markets (red), where they're killing the market for German cars. That's not something EU tariffs on China are going to be able to fix...
robinjbrooks.substack.com/p/chinas-inv...
robinjbrooks.substack.com/p/chinas-inv...
Reposted by Alejandro Nuñez-Jimenez
Closing out my year with a journal editor shocker 🧵
Checking new manuscripts today I reviewed a paper attributing 2 papers to me I did not write. A daft thing for an author to do of course. But intrigued I web searched up one of the titles and that's when it got real weird...
Checking new manuscripts today I reviewed a paper attributing 2 papers to me I did not write. A daft thing for an author to do of course. But intrigued I web searched up one of the titles and that's when it got real weird...
December 19, 2025 at 5:20 PM
Closing out my year with a journal editor shocker 🧵
Checking new manuscripts today I reviewed a paper attributing 2 papers to me I did not write. A daft thing for an author to do of course. But intrigued I web searched up one of the titles and that's when it got real weird...
Checking new manuscripts today I reviewed a paper attributing 2 papers to me I did not write. A daft thing for an author to do of course. But intrigued I web searched up one of the titles and that's when it got real weird...
@science.org chooses "The Rise of Renewables" as 2025's breakthrough
"Renewable energy, most of it from sunlight itself or from wind, ultimately driven by the Sun, overtook conventional energy on multiple fronts."
Amazing photos of the rise of the green giant!
Link www.science.org/content/arti...
"Renewable energy, most of it from sunlight itself or from wind, ultimately driven by the Sun, overtook conventional energy on multiple fronts."
Amazing photos of the rise of the green giant!
Link www.science.org/content/arti...
Science’s 2025 Breakthrough of the Year: The unstoppable rise of renewable energy
Clean energy infrastructure is being deployed with unmatched scale and speed—and China is leading the way
www.science.org
December 18, 2025 at 7:40 PM
@science.org chooses "The Rise of Renewables" as 2025's breakthrough
"Renewable energy, most of it from sunlight itself or from wind, ultimately driven by the Sun, overtook conventional energy on multiple fronts."
Amazing photos of the rise of the green giant!
Link www.science.org/content/arti...
"Renewable energy, most of it from sunlight itself or from wind, ultimately driven by the Sun, overtook conventional energy on multiple fronts."
Amazing photos of the rise of the green giant!
Link www.science.org/content/arti...
Find the full report by @eciu.net here: eciu.net/analysis/rep...
10 Years Post-Paris: How emissions decoupling has progressed
Global CO2 emissions are still rising, but this masks a striking shift beneath the surface: a growing share of the world economy is now managing to grow while cutting CO2.
eciu.net
December 13, 2025 at 4:24 PM
Find the full report by @eciu.net here: eciu.net/analysis/rep...
China, the world’s biggest emitter, "is reducing its dependence on fossil fuels. Between 2015-2023, China’s consumption-based emissions rose 24%, less than half the growth of its economy (over 50%). For the past 18 months, its emissions have plateaued and many analysts believe they may have peaked."
December 13, 2025 at 4:22 PM
China, the world’s biggest emitter, "is reducing its dependence on fossil fuels. Between 2015-2023, China’s consumption-based emissions rose 24%, less than half the growth of its economy (over 50%). For the past 18 months, its emissions have plateaued and many analysts believe they may have peaked."
GDP growth is decoupling from emissions, claims new report
"Countries [adding to 46% of global GDP] expanded their economies while cutting emissions, incl. Brazil, Colombia and Egypt. The most pronounced decouplings occurred in the UK, Norway and Switzerland." www.theguardian.com/environment/...
"Countries [adding to 46% of global GDP] expanded their economies while cutting emissions, incl. Brazil, Colombia and Egypt. The most pronounced decouplings occurred in the UK, Norway and Switzerland." www.theguardian.com/environment/...
Economic growth no longer linked to carbon emissions in most of the world, study finds
Analysis marking 10 years since Paris climate agreement underscores effectiveness of strong government policies
www.theguardian.com
December 13, 2025 at 4:19 PM
GDP growth is decoupling from emissions, claims new report
"Countries [adding to 46% of global GDP] expanded their economies while cutting emissions, incl. Brazil, Colombia and Egypt. The most pronounced decouplings occurred in the UK, Norway and Switzerland." www.theguardian.com/environment/...
"Countries [adding to 46% of global GDP] expanded their economies while cutting emissions, incl. Brazil, Colombia and Egypt. The most pronounced decouplings occurred in the UK, Norway and Switzerland." www.theguardian.com/environment/...
Reposted by Alejandro Nuñez-Jimenez
The European Union has triggered Article 122 to indefinitely immobilise the assets of the Russian Central Bank, worth a whopping €210 billion.
I explain what just happened and why this is such a big deal for Europeans.
🧵 Long thread.
I explain what just happened and why this is such a big deal for Europeans.
🧵 Long thread.
December 11, 2025 at 6:16 PM
The European Union has triggered Article 122 to indefinitely immobilise the assets of the Russian Central Bank, worth a whopping €210 billion.
I explain what just happened and why this is such a big deal for Europeans.
🧵 Long thread.
I explain what just happened and why this is such a big deal for Europeans.
🧵 Long thread.
Cool paper, thanks for sharing it!
December 11, 2025 at 11:55 AM
Cool paper, thanks for sharing it!
Reposted by Alejandro Nuñez-Jimenez
Our new study an EU #fossil #phase-out is out in @natcomms.nature.com.
www.nature.com/articles/s41...
Afaik, this is the first #IAM study investigating a complete fossil phase-out. How much do we need to reduce fossils for the EU 2050 goal? And would even a full fossil phase-out be possible?
www.nature.com/articles/s41...
Afaik, this is the first #IAM study investigating a complete fossil phase-out. How much do we need to reduce fossils for the EU 2050 goal? And would even a full fossil phase-out be possible?
From net-zero to zero-fossil in transforming the EU energy system - Nature Communications
This scenario study investigates how the EU net-zero target can be reached with varying levels of residual fossil fuels. Reducing fossils by only 90% relies on substantial carbon storage, while a full...
www.nature.com
December 11, 2025 at 11:25 AM
Our new study an EU #fossil #phase-out is out in @natcomms.nature.com.
www.nature.com/articles/s41...
Afaik, this is the first #IAM study investigating a complete fossil phase-out. How much do we need to reduce fossils for the EU 2050 goal? And would even a full fossil phase-out be possible?
www.nature.com/articles/s41...
Afaik, this is the first #IAM study investigating a complete fossil phase-out. How much do we need to reduce fossils for the EU 2050 goal? And would even a full fossil phase-out be possible?
I agree. How "visible" these trends are in terms of easily accessible data may play a role. I imagine that new car registrations are easier to find as data and compare across countries than, say, sales of bikes and electric bikes.
December 7, 2025 at 10:01 AM
I agree. How "visible" these trends are in terms of easily accessible data may play a role. I imagine that new car registrations are easier to find as data and compare across countries than, say, sales of bikes and electric bikes.
The article in The Conversation is fascinating, thanks for sharing it :)
December 7, 2025 at 9:53 AM
The article in The Conversation is fascinating, thanks for sharing it :)
Totally agree, I just don't have the data at hand to say much about how modality changes may be affecting the oil demand for transport in China. Based on the report, it does not sound like they're having the most important factor, but that doesn't mean they are necessarily unimportant.
December 6, 2025 at 7:07 PM
Totally agree, I just don't have the data at hand to say much about how modality changes may be affecting the oil demand for transport in China. Based on the report, it does not sound like they're having the most important factor, but that doesn't mean they are necessarily unimportant.
Based on the report, passenger cars seem the major driver.
"Railway passenger reached a record high of 3.5 billion in Q1-Q3 of 2025, a 6% year-on-year increase. Air travel passengers grew slightly slower, by 5.2% compared to 2024, to 581 million passengers."
But probably many factors are involved!
"Railway passenger reached a record high of 3.5 billion in Q1-Q3 of 2025, a 6% year-on-year increase. Air travel passengers grew slightly slower, by 5.2% compared to 2024, to 581 million passengers."
But probably many factors are involved!
December 6, 2025 at 11:37 AM
Based on the report, passenger cars seem the major driver.
"Railway passenger reached a record high of 3.5 billion in Q1-Q3 of 2025, a 6% year-on-year increase. Air travel passengers grew slightly slower, by 5.2% compared to 2024, to 581 million passengers."
But probably many factors are involved!
"Railway passenger reached a record high of 3.5 billion in Q1-Q3 of 2025, a 6% year-on-year increase. Air travel passengers grew slightly slower, by 5.2% compared to 2024, to 581 million passengers."
But probably many factors are involved!
The driver of lower oil demand for transport seems clear.
One in ten buses and passenger cars rolling on the streets in China in 2025 were new energy vehicles (BEV, PHEV, FCEV).
Average sales of new passenger cars for the past 12 months are now over 50% new energy vehicles.
One in ten buses and passenger cars rolling on the streets in China in 2025 were new energy vehicles (BEV, PHEV, FCEV).
Average sales of new passenger cars for the past 12 months are now over 50% new energy vehicles.
December 6, 2025 at 10:50 AM
The driver of lower oil demand for transport seems clear.
One in ten buses and passenger cars rolling on the streets in China in 2025 were new energy vehicles (BEV, PHEV, FCEV).
Average sales of new passenger cars for the past 12 months are now over 50% new energy vehicles.
One in ten buses and passenger cars rolling on the streets in China in 2025 were new energy vehicles (BEV, PHEV, FCEV).
Average sales of new passenger cars for the past 12 months are now over 50% new energy vehicles.
"[Oil] demand in the transport sector has likely peaked in 2023, implying that China’s total oil demand may be approaching a peak, unless offset by the consumption growth in other sectors such as chemicals production."
Source: energyandcleanair.org/publication/...
Source: energyandcleanair.org/publication/...
China’s Climate Transition: Outlook 2025 – Centre for Research on Energy and Clean Air
energyandcleanair.org
December 6, 2025 at 10:50 AM
"[Oil] demand in the transport sector has likely peaked in 2023, implying that China’s total oil demand may be approaching a peak, unless offset by the consumption growth in other sectors such as chemicals production."
Source: energyandcleanair.org/publication/...
Source: energyandcleanair.org/publication/...
China's oil consumption for transport may fall in 2025 almost as much as it did in 2020, during the pandemic.
"China’s oil consumption [for transport] is projected to fall for the 2nd consecutive year in 2025, declining by 4.6% year-on-year and by 7.2% compared to 2023."
"China’s oil consumption [for transport] is projected to fall for the 2nd consecutive year in 2025, declining by 4.6% year-on-year and by 7.2% compared to 2023."
December 6, 2025 at 10:50 AM
China's oil consumption for transport may fall in 2025 almost as much as it did in 2020, during the pandemic.
"China’s oil consumption [for transport] is projected to fall for the 2nd consecutive year in 2025, declining by 4.6% year-on-year and by 7.2% compared to 2023."
"China’s oil consumption [for transport] is projected to fall for the 2nd consecutive year in 2025, declining by 4.6% year-on-year and by 7.2% compared to 2023."
Reposted by Alejandro Nuñez-Jimenez
🚨job alert🚨
I'm looking to hire at least one PhD student for next year, looking at decarbonization-oriented technology deployment within an ethical frame of resource allocation and justice outcomes.
Full ad attached! Pref for CEEES admissions; deadline is 1 January.
I'm looking to hire at least one PhD student for next year, looking at decarbonization-oriented technology deployment within an ethical frame of resource allocation and justice outcomes.
Full ad attached! Pref for CEEES admissions; deadline is 1 January.
November 21, 2025 at 8:45 PM
🚨job alert🚨
I'm looking to hire at least one PhD student for next year, looking at decarbonization-oriented technology deployment within an ethical frame of resource allocation and justice outcomes.
Full ad attached! Pref for CEEES admissions; deadline is 1 January.
I'm looking to hire at least one PhD student for next year, looking at decarbonization-oriented technology deployment within an ethical frame of resource allocation and justice outcomes.
Full ad attached! Pref for CEEES admissions; deadline is 1 January.
Reposted by Alejandro Nuñez-Jimenez
Propose a session track or special session for #IST26 in Zürich (31 Aug–2 Sep 2026)!
Help us create an engaging, inclusive, and meaningful programme around the theme “Hope – in challenging times and sustainability transitions.”
🔗 Link to full call: www.transitionsnetwork.org/call-for-ses...
Help us create an engaging, inclusive, and meaningful programme around the theme “Hope – in challenging times and sustainability transitions.”
🔗 Link to full call: www.transitionsnetwork.org/call-for-ses...
October 15, 2025 at 9:19 AM
Propose a session track or special session for #IST26 in Zürich (31 Aug–2 Sep 2026)!
Help us create an engaging, inclusive, and meaningful programme around the theme “Hope – in challenging times and sustainability transitions.”
🔗 Link to full call: www.transitionsnetwork.org/call-for-ses...
Help us create an engaging, inclusive, and meaningful programme around the theme “Hope – in challenging times and sustainability transitions.”
🔗 Link to full call: www.transitionsnetwork.org/call-for-ses...