Felix Schreyer's Avatar

Felix Schreyer

@fschreyer.bsky.social

Energy systems researcher at the Potsdam Institute for Climate Impact Research (PIK). Working on climate mitigation scenarios for Germany and Europe, IAMs, renewables, hydrogen, Power-to-X.

200 Followers  |  106 Following  |  21 Posts  |  Joined: 14.11.2023  |  2.3862

Latest posts by fschreyer.bsky.social on Bluesky

Study on lowest still achievable global warming by @climateanalytics.org featuring our integrated assessment model REMIND from @pik-potsdam.bsky.social and my colleagues Fabrice Lécuyer, Chris Gong and @gunnarenergyclima.bsky.social.

06.11.2025 19:33 — 👍 1    🔁 0    💬 0    📌 0
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As coal fades, Australia looks to realize dream of 100% renewable… The country’s grid operator says shifting from coal to clean power is not only possible but inevitable. The work there could provide a road map for other…

Australia's grid operator has a clear line of sight to 100% renewables. There's nothing unknown or exotic required.

It'll be fun when the first large/major economies start hitting the goal. Too bad the US is likely to be at the rear of the pack.

06.10.2025 17:43 — 👍 741    🔁 189    💬 25    📌 15
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Power price stability and the insurance value of renewable technologies - Nature Energy Increasing solar photovoltaic and wind generation capacity beyond European 2030 targets could make electricity prices more stable, with reductions in sensitivity to fluctuations in the price of natura...

Two new papers find renewables are good insurance (they stabilize electricity price volatility in welfare improving ways)

www.nature.com/articles/s41...

www.sciencedirect.com/science/arti...
🔌💡

06.09.2025 13:47 — 👍 388    🔁 137    💬 7    📌 8
r/ChatGPTPro 
u/vurto • 28d
If ChatGPT is not consistently dependable, how are we suppose to use it for actual work?
Discussion
It's behavior and results can randomly change due to some OpenAl tweaking that's opaque.
On some days it can't even keep track of a fresh chat, it can't do calculations, it can't sort through a chat to extract relevant information, and when it's suppose to refer to source material in a PDF, it doesn't.
All because OpenAl trained it for fluency and basically to simulate whatever it can for user satisfaction.
I can use it for general chats, philosophical stuff, therapy, but nothing serious. I'm pro Al, but I approach it with skepticism knowing it's undependable (as I do with anything I read).
And prompts can be interpreted/executed differently across users' own interaction with their Als so it's not truly scalable.
How does the business world / leaders expect staff to adopt Al if it's not consistently dependable? It doesn't even calculate like a calculator. If the internet start claiming 2+2=5, that's what it'll answer with.
I'd use it for hobbies and pet projects but I can't imagine using it for anything "mission critical".

r/ChatGPTPro u/vurto • 28d If ChatGPT is not consistently dependable, how are we suppose to use it for actual work? Discussion It's behavior and results can randomly change due to some OpenAl tweaking that's opaque. On some days it can't even keep track of a fresh chat, it can't do calculations, it can't sort through a chat to extract relevant information, and when it's suppose to refer to source material in a PDF, it doesn't. All because OpenAl trained it for fluency and basically to simulate whatever it can for user satisfaction. I can use it for general chats, philosophical stuff, therapy, but nothing serious. I'm pro Al, but I approach it with skepticism knowing it's undependable (as I do with anything I read). And prompts can be interpreted/executed differently across users' own interaction with their Als so it's not truly scalable. How does the business world / leaders expect staff to adopt Al if it's not consistently dependable? It doesn't even calculate like a calculator. If the internet start claiming 2+2=5, that's what it'll answer with. I'd use it for hobbies and pet projects but I can't imagine using it for anything "mission critical".

You're so close

05.08.2025 04:36 — 👍 9375    🔁 1910    💬 188    📌 225
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Staggering figures.
Source: www.nytimes.com/2025/07/28/b...
“Nepal, The Country Where 76% of Cars Sold Are Electric”

02.08.2025 22:17 — 👍 185    🔁 67    💬 6    📌 7
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This graph from @fschreyer.bsky.social and @pik-potsdam.bsky.social colleagues illustrates the dilemma nicely "LeastCost" path involved scaling up CCS faster than historical precedents. Avoiding fossil-CDR ("FosFree") means doing same for e-fuels.

www.researchsquare.com/article/rs-5...

15.06.2025 11:49 — 👍 5    🔁 2    💬 2    📌 0
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#Ariadne-Forscher @gunnarenergyclima.bsky.social vom @pik-potsdam.bsky.social zu den notwendigen #Investitionen für eine erfolgreiche #Energiewende, die Deutschlands #Wettbewerbsfähigkeit sichert.

Mehr dazu im neuen #Szenarienreport2025 vom Kopernikus-Projekt Ariadne 👉 buff.ly/SSTJHC2

10.03.2025 10:00 — 👍 10    🔁 4    💬 0    📌 0
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Jetzt erst recht: #StandWithUkraine!
Trump wendet sich von der Ukraine ab – wir nicht! Setze mit Tausenden ein Zeichen der Solidarität und Unterstützung. Gemeinsam für Freiheit, Demokratie & ein starkes Europa!
🗓️ Sonntag, 9. März, 17 Uhr
📍 Brandenburger Tor, Berlin

07.03.2025 13:23 — 👍 245    🔁 73    💬 3    📌 5
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#Ariadne-Report kalkuliert Pfade zur #Klimaneutralität 2045 in Deutschland: Der Zusatzaufwand der #Transformation lässt sich durch kosteneffizienten #Klimaschutz je nach Szenario auf jahresdurchschnittlich 16 - 26 Mrd. Euro bis 2045 begrenzen, 0,4 - 0,7 Prozent der heutigen #Wirtschaftsleistung.

06.03.2025 08:02 — 👍 27    🔁 13    💬 4    📌 2
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Investitionen für #Klimaneutralität 2045 in 🇩🇪 werden zum Großteil durch Minderausgaben für Gas/Öl/Kohle ausgeglichen. Zusatzaufwand bei kosteneffizienter Politik 0,4-0,7% des aktuellen BIP. @ariadneprojekt.bsky.social Ariadne-Szenarienreport mit Beteiligung PIK.
👇
www.pik-potsdam.de/de/aktuelles...

06.03.2025 09:42 — 👍 13    🔁 10    💬 0    📌 2
Klimaneutralität 2045: Ariadne-Szenarienreport kalkuliert kosteneffiziente Pfade für Deutschland
YouTube video by Potsdam Institute for Climate Impact Research PIK Klimaneutralität 2045: Ariadne-Szenarienreport kalkuliert kosteneffiziente Pfade für Deutschland

Viele Monate haben #Ariadne-Forschende aus sechs am @ariadneprojekt.bsky.social beteiligten Instituten an dem neuen #Szenarienreport2025 gearbeitet. Die wichtigsten #Erkenntnisse könnt ihr jetzt auch in knapp drei Minuten auf YouTube ansehen 👇 🎞️

Mehr dazu im vollständigen Report 👉 lnkd.in/ekaXRWuT

06.03.2025 09:38 — 👍 7    🔁 6    💬 1    📌 2

Wie kommen junge Männer und Frauen eigentlich miteinander klar?

23.02.2025 22:01 — 👍 281    🔁 32    💬 48    📌 2
Befragung deutscher Millionär:innen Selbst Millionär:innen geben an, dass niedrigere Steuern für Superreiche ungerecht wären. Das zeigt diese Umfrage unter 511 deutschen Millionär:innen im Auftrag von Greenpeace und dem Netzwerk Patriot...

🤔Was sogar viele Reiche als gerecht empfinden würden, passt nicht zu den Steuerplänen von Friedrich Merz. Er möchte weitere Entlastungen für hohe Einkommen.

👉Hier gehts zum Umfrage: act.gp/4hJc9Fm

20.02.2025 16:42 — 👍 28    🔁 7    💬 0    📌 1
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Opinion | Germany’s Far-Right Comeback Germany’s attempts to “remember away” its Nazi past has instead paved the way for an extremist resurgence.

Grade noch rechtzeitig vor der Bundestagswahl: das Opinion-Stück für die @nytimes.com über das Erstarken der Rechtsextremen, effektives "truth twisting" und die deutsche Geschichtsvergessenheit.
www.nytimes.com/2025/02/20/o...

20.02.2025 11:00 — 👍 1901    🔁 572    💬 68    📌 52
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Opinion | Germany’s Far-Right Comeback (Gift Article) Germany’s attempts to “remember away” its Nazi past has instead paved the way for an extremist resurgence.

Watch this! I want his desk lamp.

20.02.2025 13:34 — 👍 116    🔁 38    💬 8    📌 3
Breakdown of battery electric car sales in selected countries and regions by car size,
2018-2023
IEA. CC BY 4.0.
Notes: BEV = battery electric vehicle; SUV = sports utility vehicle. Analysis based on sales-weighted registrations. Small cars
include A and B segments. Medium cars include C and D segments and A segments with SUV body type. Large cars include
E and F segments, multi-purpose vehicles and B segments with SUV body type. SUV category in figure encompasses
segments C to F with SUV body type.
Source: IEA analysis based on data from EV Volumes

Breakdown of battery electric car sales in selected countries and regions by car size, 2018-2023 IEA. CC BY 4.0. Notes: BEV = battery electric vehicle; SUV = sports utility vehicle. Analysis based on sales-weighted registrations. Small cars include A and B segments. Medium cars include C and D segments and A segments with SUV body type. Large cars include E and F segments, multi-purpose vehicles and B segments with SUV body type. SUV category in figure encompasses segments C to F with SUV body type. Source: IEA analysis based on data from EV Volumes

Nevertheless, from a policy perspective, it is critical to mitigate the negative
spillovers associated with an increase in larger electric cars in the fleet.
Larger electric car models have a significant impact on battery supply chains and
critical mineral demand. In 2023, the sales-weighted average battery electric SUV
in Europe had a battery almost twice as large as the one in the average small
electric car, with a proportionate impact on critical mineral needs. Of course, the
range of small cars is typically shorter than SUVs and large cars (see later section
on ranges). However, when comparing electric SUVs and medium-sized electric
cars, which in 2023 offered a similar range, the SUV battery was still 25% larger.
This means that if all electric SUVs sold in 2023 had instead been medium-sized
cars, around 60 GWh of battery equivalent could have been avoided globally, with
limited impact on range. Accounting for the different chemistries used in China,
Europe, and the United States, this would be equivalent to almost 6 000 tonnes of
lithium, 30 000 tonnes of nickel, almost 7 000 tonnes of cobalt, and over
8 000 tonnes of manganese.
Larger manganese also require more power, or longer charging times. This can
put pressure on electricity grids and charging infrastructure by increasing
occupancy, which could create issues during peak utilisation, such as at highway
charging points at high traffic times.
In addition, larger vehicles also require greater quantities of materials such as iron
and steel, aluminium and plastics, with a higher environmental and carbon
footprint for materials production, processing and assembly. Because they are
heavier, larger models also have higher electricity consumption. The additional

Nevertheless, from a policy perspective, it is critical to mitigate the negative spillovers associated with an increase in larger electric cars in the fleet. Larger electric car models have a significant impact on battery supply chains and critical mineral demand. In 2023, the sales-weighted average battery electric SUV in Europe had a battery almost twice as large as the one in the average small electric car, with a proportionate impact on critical mineral needs. Of course, the range of small cars is typically shorter than SUVs and large cars (see later section on ranges). However, when comparing electric SUVs and medium-sized electric cars, which in 2023 offered a similar range, the SUV battery was still 25% larger. This means that if all electric SUVs sold in 2023 had instead been medium-sized cars, around 60 GWh of battery equivalent could have been avoided globally, with limited impact on range. Accounting for the different chemistries used in China, Europe, and the United States, this would be equivalent to almost 6 000 tonnes of lithium, 30 000 tonnes of nickel, almost 7 000 tonnes of cobalt, and over 8 000 tonnes of manganese. Larger manganese also require more power, or longer charging times. This can put pressure on electricity grids and charging infrastructure by increasing occupancy, which could create issues during peak utilisation, such as at highway charging points at high traffic times. In addition, larger vehicles also require greater quantities of materials such as iron and steel, aluminium and plastics, with a higher environmental and carbon footprint for materials production, processing and assembly. Because they are heavier, larger models also have higher electricity consumption. The additional

energy consumption resulting from the increased mass is mitigated by
regenerative braking to some extent, but in 2022, the sales-weighted average
electricity consumption of electric SUVs was 20% higher than that of other electric
cars.
6
Major carmakers have announced launches of smaller and more affordable
electric car models over the past few years. However, when all launch
announcements are considered, far fewer smaller models are expected than
SUVs, large models and pick-up trucks. Only 25% of the 400+ launches expected
over the 2024-2028 period are small and medium models, which represents a
smaller share of available models than in 2023. Even in China, where small and
medium models have been popular, new launches are typically for larger cars.

energy consumption resulting from the increased mass is mitigated by regenerative braking to some extent, but in 2022, the sales-weighted average electricity consumption of electric SUVs was 20% higher than that of other electric cars. 6 Major carmakers have announced launches of smaller and more affordable electric car models over the past few years. However, when all launch announcements are considered, far fewer smaller models are expected than SUVs, large models and pick-up trucks. Only 25% of the 400+ launches expected over the 2024-2028 period are small and medium models, which represents a smaller share of available models than in 2023. Even in China, where small and medium models have been popular, new launches are typically for larger cars.

Nice bit from the IEA on the problem with constantly inflating EV size - mainly, massively higher mineral demand and electricity demand when charging them

iea.blob.core.windows.net/assets/a9e35...

18.02.2025 08:49 — 👍 64    🔁 18    💬 3    📌 2

I think the main strength of detailed ESMs is mostly the spatial / temporal resolution, not necessarily additional technologies in comparison to IAMs. Not sure whether you also look at spatial aspects of biomass which would be quite nice. I still need to fully read your paper. Looks interesting!

25.01.2025 15:04 — 👍 2    🔁 0    💬 1    📌 0
Redirecting

Our EU studies:

doi.org/10.1016/j.on...

doi.org/10.21203/rs....

On global level there is a study by the AIM team:

doi.org/10.1016/j.on...

25.01.2025 15:04 — 👍 2    🔁 0    💬 1    📌 0

Klar fehlt noch einiges zu #Klimaneutralität oder globalen #1.5C, aber man muss definitiv auch den #Fortschritt sehen, den wir gerade machen.

14.01.2025 21:23 — 👍 1    🔁 0    💬 0    📌 0

Projektionsbericht des #UBA bspw. sagt, dass wir aktuell 2030 die -65% etwa erreichen. Und unsere vorläufige Arbeit in #Ariadne mit Szenarien aus mehreren Modellen (Veröffentlichung bald geplant) weist auch in die Richtung, daß wir dem nahe kommen.

14.01.2025 21:23 — 👍 1    🔁 0    💬 1    📌 0

Denn die Politikinstrumente auf EU Ebene (#ETS Reform, Verbrennerverbot etc.) und deutscher Ebene (Erneuerbare Energie Reformen, #Heizungsgesetz ) wurden ja durchaus verschärft über die letzten 2-3 Jahre .

14.01.2025 21:23 — 👍 1    🔁 0    💬 1    📌 0

Stimme nicht zu, dass wir das deutsche 2030 Ziel (-65% ggü 1990) klar verfehlen werden. Hier werden einfach die Emissionsreduktionen aus diesem Jahr die nächste Jahre als Trend fortgeschrieben. Tatsächlich können wir aber stärkere Reduktionen erwarten.

14.01.2025 21:23 — 👍 1    🔁 0    💬 1    📌 0
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🚨New Paper and Policy Brief🚨

How has green hydrogen developed recently? How much hydrogen is needed for 1.5°C? And what are plausible future pathways?

In a new Nature Energy study, we look at these questions.

🔗Article: https://buff.ly/3WeOh3G
🔗Policy Brief: https://buff.ly/3C2F6wm

#EnergySky

14.01.2025 10:17 — 👍 67    🔁 28    💬 5    📌 8
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2024 war laut DWD deutlich zu warm und zu nass Auch in diesem Jahr folgte ein Temperatur-Rekord auf den nächsten. Das macht 2024 zum wärmsten Jahr seit Beginn der Aufzeichnungen - sowohl in Deutschland als auch weltweit. Experten sind zunehmend al...

#ard verwechselt leider #Klima und #Wetter. Dass 2024 1.5C über dem vorindustriellen Zeitalter lag, bedeutet nicht, dass das 1.5C Ziel von #Paris überschritten ist. Das Ziel bezieht sich auf ein klimatologisches Mittel (über 30 Jahre). www.tagesschau.de/wissen/klima...

30.12.2024 19:26 — 👍 0    🔁 0    💬 0    📌 0

Die Autoren haben mich darauf hingewiesen, dass Abfall in Deutschland bereits durch das BEHG bepreist wird. Das ist oben nicht richtig. Mein Punkt ist daher, dass Abfall vorausl ab 2028 im EU-ETS ist und dort starke Preiserhöhungen über das hinaus in den nächsten Jahre zu erwarten sind.

22.10.2024 07:34 — 👍 0    🔁 0    💬 0    📌 0

Kreislaufwirtschaft bräuchte daher viele Einzelverordnungen und es nicht so klar, wie man diese am besten aufstellt ohne ungewollte Nebenwirkungen. Vor dem Hintergrund finde ich es verständlich, CCS für Müll offenzuhalten. CO2 Preis soll zudem vermeiden, dass CCS angekündigt wird, aber nie kommt.

21.10.2024 17:37 — 👍 0    🔁 0    💬 1    📌 0

Zudem ist die Regulierung schwierig, da verschiedene Akteure betroffen sind. Das wird nicht aufgegriffen. Bald kommt ja ein CO2 Preis auf Müllverbrennung. Letztlich habe diese Anlagen aber keinen Einfluss auf die Müllmenge, sondern es ist ein Zusammenspiel aus Konsumentenverhalten und Produktdesign.

21.10.2024 17:32 — 👍 0    🔁 0    💬 0    📌 0

Ich finde den Beitrag etwas irreführend. Tatsächlich ist eine 100%ige Recyclingrate ja schwer zu erreichen. Insofern macht es Sinn CCS im Abfallsektor zu entwickeln. Natürlich sollte Kreislaufwirtschaft trotzdem vorangebracht werden.

21.10.2024 17:26 — 👍 0    🔁 0    💬 0    📌 0
Video thumbnail

In case you don’t believe the same equations describe motion in the atmosphere and the ocean.

14.09.2024 18:01 — 👍 1080    🔁 334    💬 32    📌 21
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Wie können wir erneuerbaren Strom nutzen, um fossile Energieträger nachhaltig & kostengünstig zu ersetzen? Welche Rolle #Elektrifizierung und #Wasserstoff dabei spielen könnten, beschreibt PIK-Forscher @fschreyer.bsky.social ausführlich in einem Blogbeitrag: transforming-economies.de/elektrifizie...

04.04.2024 14:31 — 👍 4    🔁 2    💬 0    📌 0

@fschreyer is following 20 prominent accounts