Jamie Matthews
@mtth.org
Web engineer. Python, Django. Sustainability, clean tech, decarbonisation. Photography, fuzz pedals and dynamic languages. Co-Founder, Technical Director.
Released django-readers 2.4.0 with support for Django 5.2 and a nice quality of life improvement for anyone using the DRF integration with schema generation: www.django-readers.org/community/ch...
Changelog - django-readers
A lightweight function-oriented toolkit for better organisation of business logic and efficient selection and projection of data in Django projects.
www.django-readers.org
April 3, 2025 at 4:13 PM
Released django-readers 2.4.0 with support for Django 5.2 and a nice quality of life improvement for anyone using the DRF integration with schema generation: www.django-readers.org/community/ch...
Reposted by Jamie Matthews
Read more about the motivation and methodology behind Greener Charge here: dabapps.com/insights/gre...
P.S. We’re officially introducing Greener Charge at the “Charge & Drive EV Experience Day” tomorrow (3rd April) from 10am-4pm on Brighton Seafront. Come say hi!
P.S. We’re officially introducing Greener Charge at the “Charge & Drive EV Experience Day” tomorrow (3rd April) from 10am-4pm on Brighton Seafront. Come say hi!
Greener Charge: Under the Hood - DabApps
Recently, we launched Greener Charge - a simple tool that gives EV owners information about when to charge their vehicles to minimise carbon emissions. But what powers this tool, and how do we know it...
dabapps.com
April 2, 2025 at 3:45 PM
Read more about the motivation and methodology behind Greener Charge here: dabapps.com/insights/gre...
P.S. We’re officially introducing Greener Charge at the “Charge & Drive EV Experience Day” tomorrow (3rd April) from 10am-4pm on Brighton Seafront. Come say hi!
P.S. We’re officially introducing Greener Charge at the “Charge & Drive EV Experience Day” tomorrow (3rd April) from 10am-4pm on Brighton Seafront. Come say hi!
I'm pretty excited to share a project we’ve been cooking up at DabApps this week: Greener Charge greenercharge.uk
Please follow @greenercharge.uk
🧵
Please follow @greenercharge.uk
🧵
March 28, 2025 at 9:41 AM
I'm pretty excited to share a project we’ve been cooking up at DabApps this week: Greener Charge greenercharge.uk
Please follow @greenercharge.uk
🧵
Please follow @greenercharge.uk
🧵
@protons4b.bsky.social this seems up your street! www.netzero.energy/content/2025...
Analysis of Powerwall Battery Retention
www.netzero.energy
March 13, 2025 at 7:11 PM
@protons4b.bsky.social this seems up your street! www.netzero.energy/content/2025...
Some musings on what LLM-friendly web APIs might look like: www.dabapps.com/insights/cou...
Could AI Bring About a Hypermedia Renaissance? - DabApps
Over the past decade or so, as APIs have moved toward JSON as the de facto standard format, some developers and architects attempted to bring hypermedia concepts along for the ride...
www.dabapps.com
February 10, 2025 at 5:34 PM
Some musings on what LLM-friendly web APIs might look like: www.dabapps.com/insights/cou...
Reposted by Jamie Matthews
A "potential" 0.43% increase in GDP *by 2050* - in return for torching the UK's climate leadership and adding vast amounts of carbon to the atmosphere - is simply not worth it.
No third runway. Grow the green economy, not airports.
www.theguardian.com/politics/liv...
No third runway. Grow the green economy, not airports.
www.theguardian.com/politics/liv...
Rachel Reeves confirms backing for third runway at Heathrow – UK politics live
The chancellor says she wants plan for runway brought forward by summer and criticises Conservatives for not acting to build runway
www.theguardian.com
January 29, 2025 at 11:00 AM
A "potential" 0.43% increase in GDP *by 2050* - in return for torching the UK's climate leadership and adding vast amounts of carbon to the atmosphere - is simply not worth it.
No third runway. Grow the green economy, not airports.
www.theguardian.com/politics/liv...
No third runway. Grow the green economy, not airports.
www.theguardian.com/politics/liv...
Reposted by Jamie Matthews
Heat pumps offer vast energy efficiency gains.
They are 4x more efficient than gas boilers.
They are 4x more efficient than gas boilers.
January 14, 2025 at 2:16 PM
Heat pumps offer vast energy efficiency gains.
They are 4x more efficient than gas boilers.
They are 4x more efficient than gas boilers.
What I’ve been calling “carbon leverage”:
“if AI helps bring forward the electrification of heating, transport and industry by a single year, that would more than offset any negative climate impact from its own relatively limited power demand.”
“if AI helps bring forward the electrification of heating, transport and industry by a single year, that would more than offset any negative climate impact from its own relatively limited power demand.”
What happens when techno-optimism meets energy system realism? My latest for @BloombergNEF is a long read on AI, called The Power and the Glory. So that's Boxing Day sorted!
about.bnef.com/blog/liebrei...
about.bnef.com/blog/liebrei...
Liebreich: Generative AI – The Power and the Glory | BloombergNEF
This year will go down in history as the year the energy sector woke up to AI. This is also the year AI woke up to energy. Is the data center power frenzy just the latest of a long line of energy sect...
about.bnef.com
December 26, 2024 at 9:21 AM
What I’ve been calling “carbon leverage”:
“if AI helps bring forward the electrification of heating, transport and industry by a single year, that would more than offset any negative climate impact from its own relatively limited power demand.”
“if AI helps bring forward the electrification of heating, transport and industry by a single year, that would more than offset any negative climate impact from its own relatively limited power demand.”
Just about scraped over the 5MWh mark for the year.
December 22, 2024 at 1:58 PM
Just about scraped over the 5MWh mark for the year.
39.3M GPU hours at 700 watts is 27.51 million kWh. 11390 tonnes would be about 410g/kWh, which sounds about right for the US grid.
Right now, according to grid.iamkate.com, UK wind farms are generating 21GW (it’s windy), so would generate 28MWh in less than 5 seconds!
(I hope my maths is right…)
Right now, according to grid.iamkate.com, UK wind farms are generating 21GW (it’s windy), so would generate 28MWh in less than 5 seconds!
(I hope my maths is right…)
Added this provocative note to my Llama 3.3 post concerning the CO2 impact of training the model, which Meta calculated as 11,390 tons CO2eq
"I believe that's equivalent to around 20 fully loaded passenger flights from New York to London (at ~550 tons per flight)." simonwillison.net/2024/Dec/6/l...
"I believe that's equivalent to around 20 fully loaded passenger flights from New York to London (at ~550 tons per flight)." simonwillison.net/2024/Dec/6/l...
Meta AI release Llama 3.3
This new [Llama-3.3-70B-Instruct model](https://huggingface.co/meta-llama/Llama-3.3-70B-Instruct) from Meta AI makes some bold claims: > This model delivers similar performance to Llama 3.1 405B with ...
simonwillison.net
December 6, 2024 at 9:43 PM
39.3M GPU hours at 700 watts is 27.51 million kWh. 11390 tonnes would be about 410g/kWh, which sounds about right for the US grid.
Right now, according to grid.iamkate.com, UK wind farms are generating 21GW (it’s windy), so would generate 28MWh in less than 5 seconds!
(I hope my maths is right…)
Right now, according to grid.iamkate.com, UK wind farms are generating 21GW (it’s windy), so would generate 28MWh in less than 5 seconds!
(I hope my maths is right…)
Reposted by Jamie Matthews
Solar results are in for a dull and grey November… 110kWh total, average 3.7kWh per day. 58% of last year and 54% of the PVGIS estimate. Rubbish! Still, looks like we’re going to pay less than £50 to run the house (including the heating) AND the car once export credit from the summer is taken off.
December 1, 2024 at 7:59 AM
Solar results are in for a dull and grey November… 110kWh total, average 3.7kWh per day. 58% of last year and 54% of the PVGIS estimate. Rubbish! Still, looks like we’re going to pay less than £50 to run the house (including the heating) AND the car once export credit from the summer is taken off.
I chatted to @chrisbaraniuk.com about thermal cameras after he tracked down one of my old tweets about an uninsulated bit of ceiling. The article is currently on the BBC News homepage. Fame at last!
I have something else to share with you this morning! A story I've been working on for a while - on the growing popularity of thermal cameras with homeowners desperate to cut their heat loss.
BUT the data can be misleading!!! Click to read about common pitfalls.
www.bbc.co.uk/news/article...
BUT the data can be misleading!!! Click to read about common pitfalls.
www.bbc.co.uk/news/article...
Could a thermal camera reveal your hidden heat loss?
Thermal imaging tech has become cheaper and homeowners are using it to track down heat loss.
www.bbc.co.uk
November 29, 2024 at 10:04 AM
I chatted to @chrisbaraniuk.com about thermal cameras after he tracked down one of my old tweets about an uninsulated bit of ceiling. The article is currently on the BBC News homepage. Fame at last!
Really excellent evening at the Brighton #peopleplanetpint meetup tonight. Three years to the day since the first one in Glasgow, there have now been 450 events across 120 cities. small99.co.uk/people-plane...
People, Planet, Pint: Sustainability Meetup - Small99
Pop down to your local People Planet Pint to find more about what’s going on locally with sustainability and how you can get involved.
small99.co.uk
November 21, 2024 at 10:30 PM
Really excellent evening at the Brighton #peopleplanetpint meetup tonight. Three years to the day since the first one in Glasgow, there have now been 450 events across 120 cities. small99.co.uk/people-plane...
Arctic air slowly arriving in the south of England. Seven degree temperature drop between 5am and noon today (purple line). Heat pump now chugging along continuously, pulling about 500 watts from the battery (blue line) and pushing nearly 2000 watts of heat into the house (yellow line).
November 19, 2024 at 1:25 PM
Arctic air slowly arriving in the south of England. Seven degree temperature drop between 5am and noon today (purple line). Heat pump now chugging along continuously, pulling about 500 watts from the battery (blue line) and pushing nearly 2000 watts of heat into the house (yellow line).
Mulling the idea of “carbon leverage”. The ability for an object or idea or process to disproportionally reduce (or, for that matter, increase) emissions far beyond the amount of carbon “invested” to create it. Example: software that controls a heat pump.
November 18, 2024 at 10:48 PM
Mulling the idea of “carbon leverage”. The ability for an object or idea or process to disproportionally reduce (or, for that matter, increase) emissions far beyond the amount of carbon “invested” to create it. Example: software that controls a heat pump.
Reposted by Jamie Matthews
What a chart.
www.economist.com/interactive/...
www.economist.com/interactive/...
November 15, 2024 at 12:37 PM
What a chart.
www.economist.com/interactive/...
www.economist.com/interactive/...
Since last posting on Bluesky, we got a heat pump. So far this month it’s cost about 1.7 pence per kWh of heat, or nearly 4 times cheaper than gas, and run entirely off our home battery or solar. Stop burning stuff!
November 15, 2024 at 9:32 PM
Since last posting on Bluesky, we got a heat pump. So far this month it’s cost about 1.7 pence per kWh of heat, or nearly 4 times cheaper than gas, and run entirely off our home battery or solar. Stop burning stuff!
OK. Let’s see if we can make it stick this time 🦋
November 15, 2024 at 9:14 PM
OK. Let’s see if we can make it stick this time 🦋
And so the heating season begins. Hopefully my last gas-powered one.
October 15, 2023 at 8:53 AM
And so the heating season begins. Hopefully my last gas-powered one.