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
I have been saying this for some time to students seeking career advice:
the energy sector is one of the most exciting places to work with a huge transformation taking place right now.
Electrification is a game changer and means a redesign of our energy system as we know it.
the energy sector is one of the most exciting places to work with a huge transformation taking place right now.
Electrification is a game changer and means a redesign of our energy system as we know it.
January 6, 2026 at 9:04 AM
I have been saying this for some time to students seeking career advice:
the energy sector is one of the most exciting places to work with a huge transformation taking place right now.
Electrification is a game changer and means a redesign of our energy system as we know it.
the energy sector is one of the most exciting places to work with a huge transformation taking place right now.
Electrification is a game changer and means a redesign of our energy system as we know it.
Well-installed heat pumps installed in the UK today achieve on average a 64% higher efficiency than those during the early trials 15 years ago.
It is testament to the brilliant installers and to the technology getting better. More in our recent paper:
www.sciencedirect.com/science/arti...
It is testament to the brilliant installers and to the technology getting better. More in our recent paper:
www.sciencedirect.com/science/arti...
January 5, 2026 at 4:11 PM
Well-installed heat pumps installed in the UK today achieve on average a 64% higher efficiency than those during the early trials 15 years ago.
It is testament to the brilliant installers and to the technology getting better. More in our recent paper:
www.sciencedirect.com/science/arti...
It is testament to the brilliant installers and to the technology getting better. More in our recent paper:
www.sciencedirect.com/science/arti...
Reposted by Jan Rosenow
The "zero-bill" home isn’t just a dream—it’s a massive opportunity to lower costs and secure our energy future.
I spoke to The Times today about how we can make this vision a reality for everyone, not just the wealthy.
The tech is here; now we just need the right policy to unlock it. 🧵
I spoke to The Times today about how we can make this vision a reality for everyone, not just the wealthy.
The tech is here; now we just need the right policy to unlock it. 🧵
January 3, 2026 at 9:17 AM
The "zero-bill" home isn’t just a dream—it’s a massive opportunity to lower costs and secure our energy future.
I spoke to The Times today about how we can make this vision a reality for everyone, not just the wealthy.
The tech is here; now we just need the right policy to unlock it. 🧵
I spoke to The Times today about how we can make this vision a reality for everyone, not just the wealthy.
The tech is here; now we just need the right policy to unlock it. 🧵
The "zero-bill" home isn’t just a dream—it’s a massive opportunity to lower costs and secure our energy future.
I spoke to The Times today about how we can make this vision a reality for everyone, not just the wealthy.
The tech is here; now we just need the right policy to unlock it. 🧵
I spoke to The Times today about how we can make this vision a reality for everyone, not just the wealthy.
The tech is here; now we just need the right policy to unlock it. 🧵
January 3, 2026 at 9:17 AM
The "zero-bill" home isn’t just a dream—it’s a massive opportunity to lower costs and secure our energy future.
I spoke to The Times today about how we can make this vision a reality for everyone, not just the wealthy.
The tech is here; now we just need the right policy to unlock it. 🧵
I spoke to The Times today about how we can make this vision a reality for everyone, not just the wealthy.
The tech is here; now we just need the right policy to unlock it. 🧵
“Housing developers in this country have a track record of pushing back against requirements that enhance energy performance of homes. We have seen this with insulation, heat pumps and other technologies. Ultimately, it will be to the detriment of the homebuyer.”
www.theguardian.com/environment/...
www.theguardian.com/environment/...
Ministers may cut green tech mandate from new homes regulations in England
Critics say removing battery installation requirement will reduce amount homebuyers save on energy bills
www.theguardian.com
January 2, 2026 at 9:34 AM
“Housing developers in this country have a track record of pushing back against requirements that enhance energy performance of homes. We have seen this with insulation, heat pumps and other technologies. Ultimately, it will be to the detriment of the homebuyer.”
www.theguardian.com/environment/...
www.theguardian.com/environment/...
2025 has been a historic year for clean energy in UK, with renewable project approvals reaching a record-high 45 GW — nearly double of 2024.
This surge was driven by an exceptional rise in battery storage capacity, which almost doubled to 28.6 GW, alongside strong growth in offshore wind & solar.
This surge was driven by an exceptional rise in battery storage capacity, which almost doubled to 28.6 GW, alongside strong growth in offshore wind & solar.
December 30, 2025 at 11:53 AM
2025 has been a historic year for clean energy in UK, with renewable project approvals reaching a record-high 45 GW — nearly double of 2024.
This surge was driven by an exceptional rise in battery storage capacity, which almost doubled to 28.6 GW, alongside strong growth in offshore wind & solar.
This surge was driven by an exceptional rise in battery storage capacity, which almost doubled to 28.6 GW, alongside strong growth in offshore wind & solar.
In most EU Member States, energy supply costs are the largest component of household electricity prices, typically accounting for around 50% of the total bill.
What’s often overlooked is the rest.
In some countries, policy costs & other taxes make up more than 25% of household electricity prices.
What’s often overlooked is the rest.
In some countries, policy costs & other taxes make up more than 25% of household electricity prices.
December 30, 2025 at 9:38 AM
In most EU Member States, energy supply costs are the largest component of household electricity prices, typically accounting for around 50% of the total bill.
What’s often overlooked is the rest.
In some countries, policy costs & other taxes make up more than 25% of household electricity prices.
What’s often overlooked is the rest.
In some countries, policy costs & other taxes make up more than 25% of household electricity prices.
Grid investment is set to rise from about USD 300bn in 2020 to nearly USD 580bn by 2027 as renewables and electrification expand. The US and China dominate spending.
But grids are not the only answer: flexibility, energy efficiency and storage can reduce and defer upgrades.
But grids are not the only answer: flexibility, energy efficiency and storage can reduce and defer upgrades.
December 28, 2025 at 1:36 PM
Grid investment is set to rise from about USD 300bn in 2020 to nearly USD 580bn by 2027 as renewables and electrification expand. The US and China dominate spending.
But grids are not the only answer: flexibility, energy efficiency and storage can reduce and defer upgrades.
But grids are not the only answer: flexibility, energy efficiency and storage can reduce and defer upgrades.
2025 comes to an end.
It’s been a strong year for deployment and innovation, but a worrying one for energy politics.
Moves like the US pause on offshore wind show how quickly progress can be undermined by polarised debate.
Here’s hoping 2026 brings calmer, more evidence-based energy policymaking.
It’s been a strong year for deployment and innovation, but a worrying one for energy politics.
Moves like the US pause on offshore wind show how quickly progress can be undermined by polarised debate.
Here’s hoping 2026 brings calmer, more evidence-based energy policymaking.
December 28, 2025 at 8:36 AM
2025 comes to an end.
It’s been a strong year for deployment and innovation, but a worrying one for energy politics.
Moves like the US pause on offshore wind show how quickly progress can be undermined by polarised debate.
Here’s hoping 2026 brings calmer, more evidence-based energy policymaking.
It’s been a strong year for deployment and innovation, but a worrying one for energy politics.
Moves like the US pause on offshore wind show how quickly progress can be undermined by polarised debate.
Here’s hoping 2026 brings calmer, more evidence-based energy policymaking.
Heat pumps remain at the top of the German heating market making up 50% of the heating market in 2025, based on sales data up to October.
@bwpev.bsky.social
@bwpev.bsky.social
December 22, 2025 at 11:21 AM
Heat pumps remain at the top of the German heating market making up 50% of the heating market in 2025, based on sales data up to October.
@bwpev.bsky.social
@bwpev.bsky.social
Reposted by Jan Rosenow
Join Prof Jan Rosenow, Professor of Energy and Climate Policy at the ECI, at the World Economic Forum in Davos next month.
Find out more ➡️https://www.weforum.org/meetings/world-economic-forum-annual-meeting-2026/
@janrosenow.bsky.social @weforum.org
Find out more ➡️https://www.weforum.org/meetings/world-economic-forum-annual-meeting-2026/
@janrosenow.bsky.social @weforum.org
I have been invited to the World Economic Forum in Davos in January 2026 and will attend.
Would love to meet up with those working on the energy transition either in one of the sessions I facilitate or informally.
Please reach out if you're there too and wish to meet up!
Would love to meet up with those working on the energy transition either in one of the sessions I facilitate or informally.
Please reach out if you're there too and wish to meet up!
December 22, 2025 at 9:44 AM
Join Prof Jan Rosenow, Professor of Energy and Climate Policy at the ECI, at the World Economic Forum in Davos next month.
Find out more ➡️https://www.weforum.org/meetings/world-economic-forum-annual-meeting-2026/
@janrosenow.bsky.social @weforum.org
Find out more ➡️https://www.weforum.org/meetings/world-economic-forum-annual-meeting-2026/
@janrosenow.bsky.social @weforum.org
Reposted by Jan Rosenow
CO₂-Reduktion in der Industrie ist kein Technologieproblem, sondern eine Frage konsequenter, integrierter Transformation und verlässlicher Rahmenbedingungen.
Das habe ich der @faznet.bsky.social gesagt.
www.faz.net/aktuell/wirt...
Das habe ich der @faznet.bsky.social gesagt.
www.faz.net/aktuell/wirt...
Industrie-Transformation: Die Suche nach dem Rezept zur CO2-Einsparung
Lars Baumgürtel und Steffen von Glahn sind Industrielle in Westfalen. Beide brauchen Prozesswärme und suchen nach Wegen CO2 einzusparen. Das Patentrezept ist noch nicht dabei.
www.faz.net
December 20, 2025 at 8:59 AM
CO₂-Reduktion in der Industrie ist kein Technologieproblem, sondern eine Frage konsequenter, integrierter Transformation und verlässlicher Rahmenbedingungen.
Das habe ich der @faznet.bsky.social gesagt.
www.faz.net/aktuell/wirt...
Das habe ich der @faznet.bsky.social gesagt.
www.faz.net/aktuell/wirt...
Reposted by Jan Rosenow
I have been invited to the World Economic Forum in Davos in January 2026 and will attend.
Would love to meet up with those working on the energy transition either in one of the sessions I facilitate or informally.
Please reach out if you're there too and wish to meet up!
Would love to meet up with those working on the energy transition either in one of the sessions I facilitate or informally.
Please reach out if you're there too and wish to meet up!
December 19, 2025 at 5:34 PM
I have been invited to the World Economic Forum in Davos in January 2026 and will attend.
Would love to meet up with those working on the energy transition either in one of the sessions I facilitate or informally.
Please reach out if you're there too and wish to meet up!
Would love to meet up with those working on the energy transition either in one of the sessions I facilitate or informally.
Please reach out if you're there too and wish to meet up!
CO₂-Reduktion in der Industrie ist kein Technologieproblem, sondern eine Frage konsequenter, integrierter Transformation und verlässlicher Rahmenbedingungen.
Das habe ich der @faznet.bsky.social gesagt.
www.faz.net/aktuell/wirt...
Das habe ich der @faznet.bsky.social gesagt.
www.faz.net/aktuell/wirt...
Industrie-Transformation: Die Suche nach dem Rezept zur CO2-Einsparung
Lars Baumgürtel und Steffen von Glahn sind Industrielle in Westfalen. Beide brauchen Prozesswärme und suchen nach Wegen CO2 einzusparen. Das Patentrezept ist noch nicht dabei.
www.faz.net
December 20, 2025 at 8:59 AM
CO₂-Reduktion in der Industrie ist kein Technologieproblem, sondern eine Frage konsequenter, integrierter Transformation und verlässlicher Rahmenbedingungen.
Das habe ich der @faznet.bsky.social gesagt.
www.faz.net/aktuell/wirt...
Das habe ich der @faznet.bsky.social gesagt.
www.faz.net/aktuell/wirt...
I have been invited to the World Economic Forum in Davos in January 2026 and will attend.
Would love to meet up with those working on the energy transition either in one of the sessions I facilitate or informally.
Please reach out if you're there too and wish to meet up!
Would love to meet up with those working on the energy transition either in one of the sessions I facilitate or informally.
Please reach out if you're there too and wish to meet up!
December 19, 2025 at 5:34 PM
I have been invited to the World Economic Forum in Davos in January 2026 and will attend.
Would love to meet up with those working on the energy transition either in one of the sessions I facilitate or informally.
Please reach out if you're there too and wish to meet up!
Would love to meet up with those working on the energy transition either in one of the sessions I facilitate or informally.
Please reach out if you're there too and wish to meet up!
Reposted by Jan Rosenow
This research was made possible by @trystanlea.bsky.social and @glynhudson.bsky.social, the brilliant team behind Open Energy Monitor
NEW RESEARCH: UK heat pumps can perform far better than many think.
Our analysis of HeatPumpMonitor.org data shows well-designed systems achieve ~40% higher efficiency than past trials (SCoP 3.86 vs 2.81), cutting bills (~£224/yr) and emissions.
Open access: www.sciencedirect.com/science/arti...
Our analysis of HeatPumpMonitor.org data shows well-designed systems achieve ~40% higher efficiency than past trials (SCoP 3.86 vs 2.81), cutting bills (~£224/yr) and emissions.
Open access: www.sciencedirect.com/science/arti...
December 19, 2025 at 11:29 AM
This research was made possible by @trystanlea.bsky.social and @glynhudson.bsky.social, the brilliant team behind Open Energy Monitor
Reposted by Jan Rosenow
NEW RESEARCH: UK heat pumps can perform far better than many think.
Our analysis of HeatPumpMonitor.org data shows well-designed systems achieve ~40% higher efficiency than past trials (SCoP 3.86 vs 2.81), cutting bills (~£224/yr) and emissions.
Open access: www.sciencedirect.com/science/arti...
Our analysis of HeatPumpMonitor.org data shows well-designed systems achieve ~40% higher efficiency than past trials (SCoP 3.86 vs 2.81), cutting bills (~£224/yr) and emissions.
Open access: www.sciencedirect.com/science/arti...
December 18, 2025 at 11:30 AM
NEW RESEARCH: UK heat pumps can perform far better than many think.
Our analysis of HeatPumpMonitor.org data shows well-designed systems achieve ~40% higher efficiency than past trials (SCoP 3.86 vs 2.81), cutting bills (~£224/yr) and emissions.
Open access: www.sciencedirect.com/science/arti...
Our analysis of HeatPumpMonitor.org data shows well-designed systems achieve ~40% higher efficiency than past trials (SCoP 3.86 vs 2.81), cutting bills (~£224/yr) and emissions.
Open access: www.sciencedirect.com/science/arti...
Reposted by Jan Rosenow
Really great to see this work on how good heat pump installs can be. An average seasonal performance factor (sCOP) of 3.9 beats gas on running costs, even in the UK where the price ratio between gas and electricity is so bad.
NEW RESEARCH: UK heat pumps can perform far better than many think.
Our analysis of HeatPumpMonitor.org data shows well-designed systems achieve ~40% higher efficiency than past trials (SCoP 3.86 vs 2.81), cutting bills (~£224/yr) and emissions.
Open access: www.sciencedirect.com/science/arti...
Our analysis of HeatPumpMonitor.org data shows well-designed systems achieve ~40% higher efficiency than past trials (SCoP 3.86 vs 2.81), cutting bills (~£224/yr) and emissions.
Open access: www.sciencedirect.com/science/arti...
December 18, 2025 at 7:08 PM
Really great to see this work on how good heat pump installs can be. An average seasonal performance factor (sCOP) of 3.9 beats gas on running costs, even in the UK where the price ratio between gas and electricity is so bad.
NEW ANALYSIS: Electric vehicles are entering the mid-transition space starting to replace ICE vehicles.
History shows that shifts like this can happen faster than expected: in the early 20th-century US, horses and mules virtually vanished from roads in under 30 years.
cdn.sanity.io/files/lrxd4j...
History shows that shifts like this can happen faster than expected: in the early 20th-century US, horses and mules virtually vanished from roads in under 30 years.
cdn.sanity.io/files/lrxd4j...
December 18, 2025 at 3:14 PM
NEW ANALYSIS: Electric vehicles are entering the mid-transition space starting to replace ICE vehicles.
History shows that shifts like this can happen faster than expected: in the early 20th-century US, horses and mules virtually vanished from roads in under 30 years.
cdn.sanity.io/files/lrxd4j...
History shows that shifts like this can happen faster than expected: in the early 20th-century US, horses and mules virtually vanished from roads in under 30 years.
cdn.sanity.io/files/lrxd4j...
Reposted by Jan Rosenow
It's been great to be part of this project with @janrosenow.bsky.social @trystanlea.bsky.social to share the results from HeatpumpMonitor.org @openenergymon.bsky.social in a peer-reviewed paper 🥳
The overall highlighted HP performance is testament to the work of excellent installers 👏 🎉
The overall highlighted HP performance is testament to the work of excellent installers 👏 🎉
December 18, 2025 at 1:54 PM
It's been great to be part of this project with @janrosenow.bsky.social @trystanlea.bsky.social to share the results from HeatpumpMonitor.org @openenergymon.bsky.social in a peer-reviewed paper 🥳
The overall highlighted HP performance is testament to the work of excellent installers 👏 🎉
The overall highlighted HP performance is testament to the work of excellent installers 👏 🎉
Reposted by Jan Rosenow
To be clear, this means better designed heat pump systems can operate in the real world at an average of around *386% efficiency*, versus roughly 80-90% for a gas boiler, making heat pumps more than £200 a year cheaper to run for the average household.
NEW RESEARCH: UK heat pumps can perform far better than many think.
Our analysis of HeatPumpMonitor.org data shows well-designed systems achieve ~40% higher efficiency than past trials (SCoP 3.86 vs 2.81), cutting bills (~£224/yr) and emissions.
Open access: www.sciencedirect.com/science/arti...
Our analysis of HeatPumpMonitor.org data shows well-designed systems achieve ~40% higher efficiency than past trials (SCoP 3.86 vs 2.81), cutting bills (~£224/yr) and emissions.
Open access: www.sciencedirect.com/science/arti...
December 18, 2025 at 12:16 PM
To be clear, this means better designed heat pump systems can operate in the real world at an average of around *386% efficiency*, versus roughly 80-90% for a gas boiler, making heat pumps more than £200 a year cheaper to run for the average household.
Reposted by Jan Rosenow
This research on modern household heat pump performance finds an average SCOP of 3.86, 40% better than older studies.
Our heat pump has achieved a SCOP of 3.85 so far this year.
Our heat pump has achieved a SCOP of 3.85 so far this year.
December 18, 2025 at 12:04 PM
This research on modern household heat pump performance finds an average SCOP of 3.86, 40% better than older studies.
Our heat pump has achieved a SCOP of 3.85 so far this year.
Our heat pump has achieved a SCOP of 3.85 so far this year.
NEW RESEARCH: UK heat pumps can perform far better than many think.
Our analysis of HeatPumpMonitor.org data shows well-designed systems achieve ~40% higher efficiency than past trials (SCoP 3.86 vs 2.81), cutting bills (~£224/yr) and emissions.
Open access: www.sciencedirect.com/science/arti...
Our analysis of HeatPumpMonitor.org data shows well-designed systems achieve ~40% higher efficiency than past trials (SCoP 3.86 vs 2.81), cutting bills (~£224/yr) and emissions.
Open access: www.sciencedirect.com/science/arti...
December 18, 2025 at 11:30 AM
NEW RESEARCH: UK heat pumps can perform far better than many think.
Our analysis of HeatPumpMonitor.org data shows well-designed systems achieve ~40% higher efficiency than past trials (SCoP 3.86 vs 2.81), cutting bills (~£224/yr) and emissions.
Open access: www.sciencedirect.com/science/arti...
Our analysis of HeatPumpMonitor.org data shows well-designed systems achieve ~40% higher efficiency than past trials (SCoP 3.86 vs 2.81), cutting bills (~£224/yr) and emissions.
Open access: www.sciencedirect.com/science/arti...
Reposted by Jan Rosenow
♨️Die Union hat mit der grundlegenden Reform des sogenannten #Heizungsgesetzes Wahlkampf gemacht. Dabei, so argumentiert @janrosenow.bsky.social, sei Unsicherheit das derzeit größte Hindernis für die Wärmewende 👇
www.wirtschaftsdienst.eu/inhalt/jahr/...
www.wirtschaftsdienst.eu/inhalt/jahr/...
Heizungsgesetz: Stabilität statt Dauerdebatte
Der Wirtschaftsdienst publiziert jeden Monat Beiträge von namhaften Autoren aus Wissenschaft, Politik und Praxis zu aktuellen Themen der Wirtschafts- und Sozialpolitik in Deutschland und der EU.
www.wirtschaftsdienst.eu
December 17, 2025 at 3:14 PM
♨️Die Union hat mit der grundlegenden Reform des sogenannten #Heizungsgesetzes Wahlkampf gemacht. Dabei, so argumentiert @janrosenow.bsky.social, sei Unsicherheit das derzeit größte Hindernis für die Wärmewende 👇
www.wirtschaftsdienst.eu/inhalt/jahr/...
www.wirtschaftsdienst.eu/inhalt/jahr/...
Mehr als 400 Kommentare unter meinem Artikel, fast alle negativ (kann nicht, darf nicht etc.).
Die Jahrsarbeitszahl unserer Wärmepumpe: 3.9.
Das ist keine Überraschung - Daten aus UK zeigen, dass auch alte und schlecht isolierte Häuser sehr gute Effizienzen erreichen.
Die Jahrsarbeitszahl unserer Wärmepumpe: 3.9.
Das ist keine Überraschung - Daten aus UK zeigen, dass auch alte und schlecht isolierte Häuser sehr gute Effizienzen erreichen.
December 17, 2025 at 1:55 PM
Mehr als 400 Kommentare unter meinem Artikel, fast alle negativ (kann nicht, darf nicht etc.).
Die Jahrsarbeitszahl unserer Wärmepumpe: 3.9.
Das ist keine Überraschung - Daten aus UK zeigen, dass auch alte und schlecht isolierte Häuser sehr gute Effizienzen erreichen.
Die Jahrsarbeitszahl unserer Wärmepumpe: 3.9.
Das ist keine Überraschung - Daten aus UK zeigen, dass auch alte und schlecht isolierte Häuser sehr gute Effizienzen erreichen.