David Perry
@dwjperry.bsky.social
Engineer/Scientist. Co-founder & CTO at BOOMPower, Director at Hepburn Energy
Used to electrify 🧠 now 🏡 (less squishy).
Used to electrify 🧠 now 🏡 (less squishy).
Reposted by David Perry
This is really quite scandalous... the key assumption that means rising oil demand is that EV sales share will be the same in 2050 as in 2024 in EVERY COUNTRY IN THE WORLD (except China+EU) 🤷♂️
🤡OIL DEMAND WILL KEEP RISING🤡
What are the IEA assumptions that make rising oil demand so improbable?
What are the IEA assumptions that make rising oil demand so improbable?
November 12, 2025 at 9:47 AM
This is really quite scandalous... the key assumption that means rising oil demand is that EV sales share will be the same in 2050 as in 2024 in EVERY COUNTRY IN THE WORLD (except China+EU) 🤷♂️
Not sure this is great policy, but it strikes me as very clever politics.
Turning negativity around almost zero solar feed-in tariffs into free power for others. No-one can hate that...
Turning negativity around almost zero solar feed-in tariffs into free power for others. No-one can hate that...
Today we announce Solar Sharer.
A plan to share the excess solar energy our nation generates to provide every Australia with free power for at least 3 hours during the day.
A plan to share the excess solar energy our nation generates to provide every Australia with free power for at least 3 hours during the day.
November 3, 2025 at 11:21 PM
Not sure this is great policy, but it strikes me as very clever politics.
Turning negativity around almost zero solar feed-in tariffs into free power for others. No-one can hate that...
Turning negativity around almost zero solar feed-in tariffs into free power for others. No-one can hate that...
Reposted by David Perry
24. We oughtta be building more wind. Seriously, solar will get built anyway, but wind needs some help, and wind blows in the dark and in the winter. It doesn’t help that solar pushes down power prices and generates renewable energy credits (where relevant), which hurts wind farm economics.
October 20, 2025 at 7:53 AM
24. We oughtta be building more wind. Seriously, solar will get built anyway, but wind needs some help, and wind blows in the dark and in the winter. It doesn’t help that solar pushes down power prices and generates renewable energy credits (where relevant), which hurts wind farm economics.
Reposted by David Perry
5. Solar modules now cost 8.9 US cents per Watt (higher in US, India due to trade barriers). Solar panels are cheaper than ordinary fencing materials. For rooftop installs, non-module cost is still $0.50-3.00 per Watt, so further module price declines make little difference.
October 20, 2025 at 7:46 AM
5. Solar modules now cost 8.9 US cents per Watt (higher in US, India due to trade barriers). Solar panels are cheaper than ordinary fencing materials. For rooftop installs, non-module cost is still $0.50-3.00 per Watt, so further module price declines make little difference.
Reposted by David Perry
This generic acetaminophen had an Amtrak ACS-64, four Amfleet 1 cars, a Conrail EMD GP15-1, and some Conrail rolling stock in it. The problem is more serious than I thought.
September 24, 2025 at 3:00 PM
This generic acetaminophen had an Amtrak ACS-64, four Amfleet 1 cars, a Conrail EMD GP15-1, and some Conrail rolling stock in it. The problem is more serious than I thought.
Reposted by David Perry
👁️👁️
A nice shift in perceived colour between central and peripheral vision. The fixated disc looks purple while the others look blue.
The effect presumably comes from the absence of S-cones in the fovea.
From Hinnerk Schulz-Hildebrandt:
arxiv.org/pdf/2509.115...
The effect presumably comes from the absence of S-cones in the fovea.
From Hinnerk Schulz-Hildebrandt:
arxiv.org/pdf/2509.115...
September 24, 2025 at 12:29 PM
👁️👁️
Ah yes, the standard "He Died with a Felafel in his Hand" clause.
An update on that insane lease term where the landlord owns everything you create during the tenancy:
September 23, 2025 at 6:18 AM
Ah yes, the standard "He Died with a Felafel in his Hand" clause.
Reposted by David Perry
Just made a few corrections to the gas industry billboard at Darwin airport.
You're welcome Australian Energy Producers.
You're welcome Australian Energy Producers.
September 18, 2025 at 11:08 PM
Just made a few corrections to the gas industry billboard at Darwin airport.
You're welcome Australian Energy Producers.
You're welcome Australian Energy Producers.
Reposted by David Perry
Solar panels now cost peanuts (under 10 cents per W) in most of the world.
Carbon dioxide emissions in high-income countries are now falling, and there's reason to believe other countries will be able to develop much more sustainably than those did.
ourworldindata.org/grapher/annu...
Carbon dioxide emissions in high-income countries are now falling, and there's reason to believe other countries will be able to develop much more sustainably than those did.
ourworldindata.org/grapher/annu...
September 15, 2025 at 6:59 AM
Solar panels now cost peanuts (under 10 cents per W) in most of the world.
Carbon dioxide emissions in high-income countries are now falling, and there's reason to believe other countries will be able to develop much more sustainably than those did.
ourworldindata.org/grapher/annu...
Carbon dioxide emissions in high-income countries are now falling, and there's reason to believe other countries will be able to develop much more sustainably than those did.
ourworldindata.org/grapher/annu...
Reposted by David Perry
🚋🎳🏆🤩World Tram Driver Championship coming to Melbourne in 2027! A chance to exchange ideas, learn from other cities, and a home ground advantage - what's not to like?!
September 14, 2025 at 1:52 AM
🚋🎳🏆🤩World Tram Driver Championship coming to Melbourne in 2027! A chance to exchange ideas, learn from other cities, and a home ground advantage - what's not to like?!
Fucks sake, there really is no escape is there.
September 1, 2025 at 10:36 AM
Fucks sake, there really is no escape is there.
Reposted by David Perry
NEW: The first evidence of a solar take-off in Africa☀️✈️
x33 rise in Algeria solar panel imports in the 12 mths to June 2025, compared to previous 12 mths.
x8 in Zambia
x7 in Botswana
x6 in Sudan
x3 in each of Liberia, DRC, Benin, Angola, Ethiopia
🧵
x33 rise in Algeria solar panel imports in the 12 mths to June 2025, compared to previous 12 mths.
x8 in Zambia
x7 in Botswana
x6 in Sudan
x3 in each of Liberia, DRC, Benin, Angola, Ethiopia
🧵
August 26, 2025 at 7:23 AM
NEW: The first evidence of a solar take-off in Africa☀️✈️
x33 rise in Algeria solar panel imports in the 12 mths to June 2025, compared to previous 12 mths.
x8 in Zambia
x7 in Botswana
x6 in Sudan
x3 in each of Liberia, DRC, Benin, Angola, Ethiopia
🧵
x33 rise in Algeria solar panel imports in the 12 mths to June 2025, compared to previous 12 mths.
x8 in Zambia
x7 in Botswana
x6 in Sudan
x3 in each of Liberia, DRC, Benin, Angola, Ethiopia
🧵
Reposted by David Perry
My favourite stat is that Australia’s domestic use is equal to that of the gas used to compress gas into liquid for export.
Australia’s gas industry uses more of its own gas than any other sector of the economy, in a self-reinforcing demand cycle, according to a new report by climate finance group Market Forces.
Latest from me in @reneweconomy.com.au:
Latest from me in @reneweconomy.com.au:
Australian gas industry is the biggest user of Australian gas, says new report
New report finds the gas industry alone burns more gas just to operate LNG export terminals than the entire Australian manufacturing sector.
reneweconomy.com.au
August 19, 2025 at 5:09 AM
My favourite stat is that Australia’s domestic use is equal to that of the gas used to compress gas into liquid for export.
Reposted by David Perry
I do bloody love this chart. Who'd have thought, 20 years ago, that solar would be ~10% of world electricity generation by 2024 - and over 20% in some countries, rising rapidly in others?
Definitely not me. When I started this job I hoped to be part of a solution for maybe 1% of global electricity.
Definitely not me. When I started this job I hoped to be part of a solution for maybe 1% of global electricity.
August 6, 2025 at 7:37 AM
I do bloody love this chart. Who'd have thought, 20 years ago, that solar would be ~10% of world electricity generation by 2024 - and over 20% in some countries, rising rapidly in others?
Definitely not me. When I started this job I hoped to be part of a solution for maybe 1% of global electricity.
Definitely not me. When I started this job I hoped to be part of a solution for maybe 1% of global electricity.
Reposted by David Perry
For folks who are thinking about induction cooking, I recommend starting with an induction hotplate, which are like $65 at Ikea or wherever. Most people are really happy with the cooking experience and often move half or more of their cooking to induction, even with just one "burner" available.
July 27, 2025 at 9:31 PM
For folks who are thinking about induction cooking, I recommend starting with an induction hotplate, which are like $65 at Ikea or wherever. Most people are really happy with the cooking experience and often move half or more of their cooking to induction, even with just one "burner" available.
I'm terribly embarrassed to admit I was a fan of the Cybertruck styling. Folded sheet metal is a cool manufacturing process and aesthetic. Instead Tesla delivered a lame glued-together mess.
Turns out this is what I was really looking for:
Turns out this is what I was really looking for:
Introducing the Jaunt electric Moke
YouTube video by Jaunt - Electric Vehicles
www.youtube.com
July 24, 2025 at 12:24 PM
I'm terribly embarrassed to admit I was a fan of the Cybertruck styling. Folded sheet metal is a cool manufacturing process and aesthetic. Instead Tesla delivered a lame glued-together mess.
Turns out this is what I was really looking for:
Turns out this is what I was really looking for:
Heading into this thread to pick a fight with anyone who says otherwise...
Rooftop solar power in Australia is the cheapest power available to consumers in the world, full stop. I wish more people knew that.
July 23, 2025 at 1:19 PM
Heading into this thread to pick a fight with anyone who says otherwise...
Reposted by David Perry
Rooftop solar power in Australia is the cheapest power available to consumers in the world, full stop. I wish more people knew that.
July 22, 2025 at 8:56 PM
Rooftop solar power in Australia is the cheapest power available to consumers in the world, full stop. I wish more people knew that.
Reposted by David Perry
It's not hyperbole to say that Pakistan is on track to leapfrog traditional power grids and jump straight to loosely-connected (and when needed, off-grid) distributed solar + battery systems. It's like developing countries leapfrogging land-lines and moving straight to cell phones. It's incredible.
Pakistan's battery boom is definitely starting!
I got the battery data and it's $95m of batteries in March to May alone..
I got the battery data and it's $95m of batteries in March to May alone..
June 30, 2025 at 5:56 PM
It's not hyperbole to say that Pakistan is on track to leapfrog traditional power grids and jump straight to loosely-connected (and when needed, off-grid) distributed solar + battery systems. It's like developing countries leapfrogging land-lines and moving straight to cell phones. It's incredible.
Reposted by David Perry
June 26, 2025 at 10:44 AM
Reposted by David Perry
Who should I be crediting with coming up with BYONCE (Bring Your Own New Clean Energy)?
June 10, 2025 at 2:36 PM
Who should I be crediting with coming up with BYONCE (Bring Your Own New Clean Energy)?
Hot singles in your area?
Use them for space heating.
Use them for space heating.
![Comic. [Two houses next to each other. Piping runs from one underground, connecting it to the other.] [caption] A covertly-installed *Neighbor-Source Heat Pump* takes advantage of the fact that your neighbor keeps their house cool in the summer and warm in the winter.](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:cz73r7iyiqn26upot4jtjdhk/bafkreihme75kw3ibwada5jzdvby6ctmeiuwpvwxkwcuww4bag43agicxz4@jpeg)
June 9, 2025 at 11:02 PM
Hot singles in your area?
Use them for space heating.
Use them for space heating.
Reposted by David Perry
Just putting this out there for all the people who think we're going too fast on decarbonisation
Earth will warm 1.5 degrees Celsius above preindustrial levels in just two years, new data shows. Irreversible tipping points — like the melting of Arctic ice sheets or the collapse of coral reefs — are closer at hand than previously believed.
Earth is likely to cross a key climate threshold in two years
A new World Meteorological Organization report spells the end of the world’s most famous climate goal.
www.washingtonpost.com
June 6, 2025 at 1:57 AM
Just putting this out there for all the people who think we're going too fast on decarbonisation
My company BOOM! Power builds software that helps homes go all-electric!
We're currently hiring a software engineer / data scientist. Fully remote, Australia-based. Would love to hear from anyone keen to work on climate and energy.
We're currently hiring a software engineer / data scientist. Fully remote, Australia-based. Would love to hear from anyone keen to work on climate and energy.
BOOM! Power hiring Software Developer & Data Scientist in Australia | LinkedIn
Posted 3:52:01 AM. About BOOM! Power:Join Australia’s leading home electrification marketplace software platform…See this and similar jobs on LinkedIn.
www.linkedin.com
May 20, 2025 at 11:24 AM
My company BOOM! Power builds software that helps homes go all-electric!
We're currently hiring a software engineer / data scientist. Fully remote, Australia-based. Would love to hear from anyone keen to work on climate and energy.
We're currently hiring a software engineer / data scientist. Fully remote, Australia-based. Would love to hear from anyone keen to work on climate and energy.
I enjoyed this. Transmission towers going up in a day, by hand, shovels and winches.
Albeit before safety was invented...
Albeit before safety was invented...
THE FIRST HALF-MILLION VOLT D.C. TRANSMISSION LINE (1965) (AAPG W3606/1161)
YouTube video by Archives New Zealand
youtu.be
May 5, 2025 at 10:35 AM
I enjoyed this. Transmission towers going up in a day, by hand, shovels and winches.
Albeit before safety was invented...
Albeit before safety was invented...