Jan Rosenow
@janrosenow.bsky.social
Professor of Energy & Climate Policy at University of Oxford
Energy Programme Leader at ECI, University of Oxford
Senior Research Fellow at Oriel College, Oxford
Senior Associate Institute for Sustainability Leadership, University of Cambridge
Energy Programme Leader at ECI, University of Oxford
Senior Research Fellow at Oriel College, Oxford
Senior Associate Institute for Sustainability Leadership, University of Cambridge
Heat pumps are the most efficiency heating technology ever invented.
That's because they harvest, compress and transport pre-existing heat from the air, the ground or the water.
Compared to a gas boiler heat pumps deliver ~4x more heat for each unit of energy inout.
That's because they harvest, compress and transport pre-existing heat from the air, the ground or the water.
Compared to a gas boiler heat pumps deliver ~4x more heat for each unit of energy inout.
November 21, 2025 at 10:40 AM
Heat pumps are the most efficiency heating technology ever invented.
That's because they harvest, compress and transport pre-existing heat from the air, the ground or the water.
Compared to a gas boiler heat pumps deliver ~4x more heat for each unit of energy inout.
That's because they harvest, compress and transport pre-existing heat from the air, the ground or the water.
Compared to a gas boiler heat pumps deliver ~4x more heat for each unit of energy inout.
Global investment in electrification in the transport sector has increased markedly over the last 7years.
Building electrification investment is up too but has been growing at a much slower pace.
There is some catching up to do.
Building electrification investment is up too but has been growing at a much slower pace.
There is some catching up to do.
November 21, 2025 at 7:36 AM
Global investment in electrification in the transport sector has increased markedly over the last 7years.
Building electrification investment is up too but has been growing at a much slower pace.
There is some catching up to do.
Building electrification investment is up too but has been growing at a much slower pace.
There is some catching up to do.
Solar capacity is expected to triple based on new projects in the pipeline.
Total global solar capacity, including all projects in construction and planned, is expected to reach almost 3 terawatts, with 80% concentrated in just 15 countries.
Data @globalenergymon.bsky.social
Total global solar capacity, including all projects in construction and planned, is expected to reach almost 3 terawatts, with 80% concentrated in just 15 countries.
Data @globalenergymon.bsky.social
November 21, 2025 at 6:51 AM
Solar capacity is expected to triple based on new projects in the pipeline.
Total global solar capacity, including all projects in construction and planned, is expected to reach almost 3 terawatts, with 80% concentrated in just 15 countries.
Data @globalenergymon.bsky.social
Total global solar capacity, including all projects in construction and planned, is expected to reach almost 3 terawatts, with 80% concentrated in just 15 countries.
Data @globalenergymon.bsky.social
First electric cars and buses, now trucks: in the past we were often told that electric trucks would not be feasible.
But the market is picking up speed and electric trucks have become a reality. Expectations are for significant market expansion in the coming years.
But the market is picking up speed and electric trucks have become a reality. Expectations are for significant market expansion in the coming years.
November 20, 2025 at 12:11 PM
First electric cars and buses, now trucks: in the past we were often told that electric trucks would not be feasible.
But the market is picking up speed and electric trucks have become a reality. Expectations are for significant market expansion in the coming years.
But the market is picking up speed and electric trucks have become a reality. Expectations are for significant market expansion in the coming years.
Would you prefer one of these?
November 19, 2025 at 9:47 PM
Would you prefer one of these?
🚀 Huge step forward for decarbonising heat: Construction has started on world’s largest seasonal thermal energy storage facility in Vantaa, Finland.
Massive underground caverns will store 1.1m m³ of hot water — around 90 GWh of heat, enough to warm an entire town through winter.
Massive underground caverns will store 1.1m m³ of hot water — around 90 GWh of heat, enough to warm an entire town through winter.
November 19, 2025 at 2:43 PM
🚀 Huge step forward for decarbonising heat: Construction has started on world’s largest seasonal thermal energy storage facility in Vantaa, Finland.
Massive underground caverns will store 1.1m m³ of hot water — around 90 GWh of heat, enough to warm an entire town through winter.
Massive underground caverns will store 1.1m m³ of hot water — around 90 GWh of heat, enough to warm an entire town through winter.
NEW RESEARCH:
Demand flexibility becomes more and more attractive.
We found a whopping 480 smart tariffs and services across Europe — a 3x increase since our 2021/2022 study.
www.sciencedirect.com/science/arti...
@jaapburger.eu @regassistproj.bsky.social @ecioxford.bsky.social
Demand flexibility becomes more and more attractive.
We found a whopping 480 smart tariffs and services across Europe — a 3x increase since our 2021/2022 study.
www.sciencedirect.com/science/arti...
@jaapburger.eu @regassistproj.bsky.social @ecioxford.bsky.social
November 19, 2025 at 8:15 AM
NEW RESEARCH:
Demand flexibility becomes more and more attractive.
We found a whopping 480 smart tariffs and services across Europe — a 3x increase since our 2021/2022 study.
www.sciencedirect.com/science/arti...
@jaapburger.eu @regassistproj.bsky.social @ecioxford.bsky.social
Demand flexibility becomes more and more attractive.
We found a whopping 480 smart tariffs and services across Europe — a 3x increase since our 2021/2022 study.
www.sciencedirect.com/science/arti...
@jaapburger.eu @regassistproj.bsky.social @ecioxford.bsky.social
10 years ago hydrogen buses were hyped and many cities ordered them.
Today the picture is clear: electric buses rule, hydrogen buses whither.
Today the picture is clear: electric buses rule, hydrogen buses whither.
November 18, 2025 at 7:39 PM
10 years ago hydrogen buses were hyped and many cities ordered them.
Today the picture is clear: electric buses rule, hydrogen buses whither.
Today the picture is clear: electric buses rule, hydrogen buses whither.
Seems like Bluesky also introduced verification/ blue tick but not one you can buy so more like the old Twitter one.
November 18, 2025 at 6:20 PM
Seems like Bluesky also introduced verification/ blue tick but not one you can buy so more like the old Twitter one.
Europe's electricity system is changing rapidly and often in places that don't make the headlines.
Look at Estonia - not that long ago and fossil fuels dominated around 90% of electricity generation.
Today solar and wind eat more and more into the share of fossil fuel-generated electricity.
Look at Estonia - not that long ago and fossil fuels dominated around 90% of electricity generation.
Today solar and wind eat more and more into the share of fossil fuel-generated electricity.
November 18, 2025 at 2:32 PM
Europe's electricity system is changing rapidly and often in places that don't make the headlines.
Look at Estonia - not that long ago and fossil fuels dominated around 90% of electricity generation.
Today solar and wind eat more and more into the share of fossil fuel-generated electricity.
Look at Estonia - not that long ago and fossil fuels dominated around 90% of electricity generation.
Today solar and wind eat more and more into the share of fossil fuel-generated electricity.
Earlier this year world’s largest battery-electric ship was successfully launched from the main production hall of Incat Tasmania into the River Derwent in Hobart, Australia.
The ferry carries 2,100 passengers and 225 vehicles.
The ferry carries 2,100 passengers and 225 vehicles.
November 14, 2025 at 3:31 PM
Earlier this year world’s largest battery-electric ship was successfully launched from the main production hall of Incat Tasmania into the River Derwent in Hobart, Australia.
The ferry carries 2,100 passengers and 225 vehicles.
The ferry carries 2,100 passengers and 225 vehicles.
In the global electrification race China is marching ahead.
The US and Europe risk falling behind clinging on to yesterday's technologies.
The US and Europe risk falling behind clinging on to yesterday's technologies.
November 14, 2025 at 1:51 PM
In the global electrification race China is marching ahead.
The US and Europe risk falling behind clinging on to yesterday's technologies.
The US and Europe risk falling behind clinging on to yesterday's technologies.
How to rapidly scale the heat pump market?
“The main hurdle is the price ratio of gas to electricity. [Reforming taxation of energy] would unlock a much more market-driven transition.”
That’s what I told the FT. Excellent piece.
“The main hurdle is the price ratio of gas to electricity. [Reforming taxation of energy] would unlock a much more market-driven transition.”
That’s what I told the FT. Excellent piece.
November 14, 2025 at 7:09 AM
How to rapidly scale the heat pump market?
“The main hurdle is the price ratio of gas to electricity. [Reforming taxation of energy] would unlock a much more market-driven transition.”
That’s what I told the FT. Excellent piece.
“The main hurdle is the price ratio of gas to electricity. [Reforming taxation of energy] would unlock a much more market-driven transition.”
That’s what I told the FT. Excellent piece.
Over 2/3 of primary energy is wasted as heat.
The transition isn’t about matching that waste — it’s about outperforming it with efficient clean energy technology.
The transition isn’t about matching that waste — it’s about outperforming it with efficient clean energy technology.
November 13, 2025 at 8:37 PM
Over 2/3 of primary energy is wasted as heat.
The transition isn’t about matching that waste — it’s about outperforming it with efficient clean energy technology.
The transition isn’t about matching that waste — it’s about outperforming it with efficient clean energy technology.
This should be fun: I accepted to serve as a Judge for the upcoming Global Energy Transition Awards hosted by Reuters Events alongside fellow judges Jigar Shah, Amy Jaffe, Brian Dean and Rita Dias.
November 13, 2025 at 3:16 PM
This should be fun: I accepted to serve as a Judge for the upcoming Global Energy Transition Awards hosted by Reuters Events alongside fellow judges Jigar Shah, Amy Jaffe, Brian Dean and Rita Dias.
A reminder: energy isn't just electricity.
Many countries have done well to decarbonise the tip of the energy iceberg - electricity.
The hard bit is what's below the tip of the iceberg - heat, cooling and transport.
Many countries have done well to decarbonise the tip of the energy iceberg - electricity.
The hard bit is what's below the tip of the iceberg - heat, cooling and transport.
November 13, 2025 at 2:13 PM
A reminder: energy isn't just electricity.
Many countries have done well to decarbonise the tip of the energy iceberg - electricity.
The hard bit is what's below the tip of the iceberg - heat, cooling and transport.
Many countries have done well to decarbonise the tip of the energy iceberg - electricity.
The hard bit is what's below the tip of the iceberg - heat, cooling and transport.
Churches across the UK — some centuries-old, uninsulated, many heritage buildings — are embracing electric heat-pump systems to replace oil and gas boilers. It’s a powerful symbol of how decarbonisation and stewardship go hand-in-hand.
www.thereengineer.pro/p/let-there-...
www.thereengineer.pro/p/let-there-...
November 13, 2025 at 12:33 PM
Churches across the UK — some centuries-old, uninsulated, many heritage buildings — are embracing electric heat-pump systems to replace oil and gas boilers. It’s a powerful symbol of how decarbonisation and stewardship go hand-in-hand.
www.thereengineer.pro/p/let-there-...
www.thereengineer.pro/p/let-there-...
Truly remarkable: Poland used to be a climate laggard.
Today, wind and solar are increasingly replacing coal in the Polish electricity mix with almost 30% of all electricity generated to date this year from wind and solar.
In 2000 coal provided 95% of Polish electricity.
Today it is at 51%.
Today, wind and solar are increasingly replacing coal in the Polish electricity mix with almost 30% of all electricity generated to date this year from wind and solar.
In 2000 coal provided 95% of Polish electricity.
Today it is at 51%.
November 13, 2025 at 8:47 AM
Truly remarkable: Poland used to be a climate laggard.
Today, wind and solar are increasingly replacing coal in the Polish electricity mix with almost 30% of all electricity generated to date this year from wind and solar.
In 2000 coal provided 95% of Polish electricity.
Today it is at 51%.
Today, wind and solar are increasingly replacing coal in the Polish electricity mix with almost 30% of all electricity generated to date this year from wind and solar.
In 2000 coal provided 95% of Polish electricity.
Today it is at 51%.
The end of the internal combustion engine?
Sales of petrol and diesel cars in China peaked in 2017 and are now falling rapidly.
The shift to electric and low-carbon transport is well underway—and EV sales are rising fast.
Sales of petrol and diesel cars in China peaked in 2017 and are now falling rapidly.
The shift to electric and low-carbon transport is well underway—and EV sales are rising fast.
November 12, 2025 at 3:36 PM
The end of the internal combustion engine?
Sales of petrol and diesel cars in China peaked in 2017 and are now falling rapidly.
The shift to electric and low-carbon transport is well underway—and EV sales are rising fast.
Sales of petrol and diesel cars in China peaked in 2017 and are now falling rapidly.
The shift to electric and low-carbon transport is well underway—and EV sales are rising fast.
The Talatan Solar Park in China is absurdly huge — stretching across 600 km² of the Tibetan Plateau (about 7× Manhattan’s size) and generating around 17 GW of power.
It’s so big you can see it from space — a shimmering sea of panels.
It’s so big you can see it from space — a shimmering sea of panels.
November 12, 2025 at 2:39 PM
The Talatan Solar Park in China is absurdly huge — stretching across 600 km² of the Tibetan Plateau (about 7× Manhattan’s size) and generating around 17 GW of power.
It’s so big you can see it from space — a shimmering sea of panels.
It’s so big you can see it from space — a shimmering sea of panels.
Contrary to some media reports, heat pumps aren’t new tech — they’ve been around for 100+ years!
✅ First built in 1856 by Peter von Rittinger
✅ Zurich City Hall used one from 1938–2001
✅ UK’s first in 1945 (Norwich)
✅ ~200 million in use worldwide today
✅ First built in 1856 by Peter von Rittinger
✅ Zurich City Hall used one from 1938–2001
✅ UK’s first in 1945 (Norwich)
✅ ~200 million in use worldwide today
November 12, 2025 at 11:19 AM
Contrary to some media reports, heat pumps aren’t new tech — they’ve been around for 100+ years!
✅ First built in 1856 by Peter von Rittinger
✅ Zurich City Hall used one from 1938–2001
✅ UK’s first in 1945 (Norwich)
✅ ~200 million in use worldwide today
✅ First built in 1856 by Peter von Rittinger
✅ Zurich City Hall used one from 1938–2001
✅ UK’s first in 1945 (Norwich)
✅ ~200 million in use worldwide today
China’s CO2 emissions have now been flat or falling for 18 months, starting in March 2024.
This trend continued in the third quarter of 2025, when emissions were unchanged year-on-year.
If this trend starts to move into sustained carbon emissions reduction it would be hugely significant.
This trend continued in the third quarter of 2025, when emissions were unchanged year-on-year.
If this trend starts to move into sustained carbon emissions reduction it would be hugely significant.
November 11, 2025 at 9:00 PM
China’s CO2 emissions have now been flat or falling for 18 months, starting in March 2024.
This trend continued in the third quarter of 2025, when emissions were unchanged year-on-year.
If this trend starts to move into sustained carbon emissions reduction it would be hugely significant.
This trend continued in the third quarter of 2025, when emissions were unchanged year-on-year.
If this trend starts to move into sustained carbon emissions reduction it would be hugely significant.
Europe is a world leader in industrial electrification solutions:
61% of all industrial heat pump and electro-thermal storage manufacturers are headquartered in Europe.
US is also very strong in electro-thermal storage when it comes to companies located there.
Note: This is preliminary data.
61% of all industrial heat pump and electro-thermal storage manufacturers are headquartered in Europe.
US is also very strong in electro-thermal storage when it comes to companies located there.
Note: This is preliminary data.
November 11, 2025 at 2:48 PM
Europe is a world leader in industrial electrification solutions:
61% of all industrial heat pump and electro-thermal storage manufacturers are headquartered in Europe.
US is also very strong in electro-thermal storage when it comes to companies located there.
Note: This is preliminary data.
61% of all industrial heat pump and electro-thermal storage manufacturers are headquartered in Europe.
US is also very strong in electro-thermal storage when it comes to companies located there.
Note: This is preliminary data.
A decade ago, solar power barely registered in Hungary’s electricity mix — just 0.2% of generation. Back then, nuclear, coal, and gas dominated the grid.
Fast forward ten years and solar power now supplies around 1/4 of Hungary’s electricity — a remarkable transformation.
Fast forward ten years and solar power now supplies around 1/4 of Hungary’s electricity — a remarkable transformation.
November 11, 2025 at 11:41 AM
A decade ago, solar power barely registered in Hungary’s electricity mix — just 0.2% of generation. Back then, nuclear, coal, and gas dominated the grid.
Fast forward ten years and solar power now supplies around 1/4 of Hungary’s electricity — a remarkable transformation.
Fast forward ten years and solar power now supplies around 1/4 of Hungary’s electricity — a remarkable transformation.
There's an army of people out there telling us change is impossible.
Only that it is not.
10 years ago electric vehicles plaid almost no role in global car sales.
Today one in five cars sold worldwide is electric.
Only that it is not.
10 years ago electric vehicles plaid almost no role in global car sales.
Today one in five cars sold worldwide is electric.
November 11, 2025 at 10:34 AM
There's an army of people out there telling us change is impossible.
Only that it is not.
10 years ago electric vehicles plaid almost no role in global car sales.
Today one in five cars sold worldwide is electric.
Only that it is not.
10 years ago electric vehicles plaid almost no role in global car sales.
Today one in five cars sold worldwide is electric.