John Mann
@jm493.bsky.social
Melbourne, Australia
Born 313 ppm CO2
Interested in
- Renewables energy transition
- Slide rules and other old technology
- Linux and network automation
- Quality political representation
- Christmas Lights
Previously jm493_au on Twitter
Born 313 ppm CO2
Interested in
- Renewables energy transition
- Slide rules and other old technology
- Linux and network automation
- Quality political representation
- Christmas Lights
Previously jm493_au on Twitter
Try e.g. archive.vn/7oaZ8
Looks like it has a Raspberry Pi Compute Module 4 (CM4) inside.
No wonder they aren't cheap.
Looks like it has a Raspberry Pi Compute Module 4 (CM4) inside.
No wonder they aren't cheap.
August 9, 2025 at 12:09 AM
Try e.g. archive.vn/7oaZ8
Looks like it has a Raspberry Pi Compute Module 4 (CM4) inside.
No wonder they aren't cheap.
Looks like it has a Raspberry Pi Compute Module 4 (CM4) inside.
No wonder they aren't cheap.
Will we see the "AI Data Centres will eat all the electricity" scare bubbles deflate?
May 27, 2025 at 8:00 PM
Will we see the "AI Data Centres will eat all the electricity" scare bubbles deflate?
YES Oz is moving away from coal.
Here's % generation, and last financial year
Here's % generation, and last financial year
May 6, 2025 at 9:23 PM
YES Oz is moving away from coal.
Here's % generation, and last financial year
Here's % generation, and last financial year
*Cough*
Billy McMahon wasn't a hippy.
He was a Liberal that stopped Australia's first nuclear power plant.
en.m.wikipedia.org/wiki/Jervis_...
Billy McMahon wasn't a hippy.
He was a Liberal that stopped Australia's first nuclear power plant.
en.m.wikipedia.org/wiki/Jervis_...
![Before this recommendation was made, there was a change of prime minister, although not of government. John Gorton had been a supporter of the project. In March 1971, Gorton was replaced as prime minister by William McMahon. McMahon opposed the nuclear power program, and the project was deferred for a year, citing financial constraints – Treasury prepared the first comprehensive comparative cost analysis in 1971 and concluded that nuclear was going to be far more expensive than a conventional coal plant.[5][6][7]
Following the discovery of natural gas and oil in Bass Strait, and the development of economic coal resources, most of the energy security incentive had evaporated. Tenders were re-called, only to be again deferred and in practical terms cancelled in June 1971. Organisations like the World Union for Protection of Life, the Ecology Action and the Society for Responsibility in Science had reported about the dangers connected with the nuclear power plant.[8]](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:txjimhv3mt4umrdklht5di2v/bafkreihk6qm32kdjknadka4rx4ddaizrfyzqj3faxifahksihngu75rxbm@jpeg)
May 3, 2025 at 2:21 AM
*Cough*
Billy McMahon wasn't a hippy.
He was a Liberal that stopped Australia's first nuclear power plant.
en.m.wikipedia.org/wiki/Jervis_...
Billy McMahon wasn't a hippy.
He was a Liberal that stopped Australia's first nuclear power plant.
en.m.wikipedia.org/wiki/Jervis_...
> nuclear power could have been supported politically
Which politicians would support bad economics?
> The Greens anti-nuclear politics started in 1980 in Germany.
I have a "Smiling Sun" badge from [Uranium mining] protests before then...
en.wikipedia.org/wiki/Anti-nu...
Which politicians would support bad economics?
> The Greens anti-nuclear politics started in 1980 in Germany.
I have a "Smiling Sun" badge from [Uranium mining] protests before then...
en.wikipedia.org/wiki/Anti-nu...
May 2, 2025 at 12:42 PM
> nuclear power could have been supported politically
Which politicians would support bad economics?
> The Greens anti-nuclear politics started in 1980 in Germany.
I have a "Smiling Sun" badge from [Uranium mining] protests before then...
en.wikipedia.org/wiki/Anti-nu...
Which politicians would support bad economics?
> The Greens anti-nuclear politics started in 1980 in Germany.
I have a "Smiling Sun" badge from [Uranium mining] protests before then...
en.wikipedia.org/wiki/Anti-nu...
It is cost-effective to build enough storage for 6 hours of grid load.
This gets rid of baseload coal and gas peakers, and reduces gas to a role of occasional backup.
Don't forget, that as well as rooftop solar (yellow), there's solar farms (dark yellow), and wind (green) which does more at night.
This gets rid of baseload coal and gas peakers, and reduces gas to a role of occasional backup.
Don't forget, that as well as rooftop solar (yellow), there's solar farms (dark yellow), and wind (green) which does more at night.
April 14, 2025 at 3:01 AM
It is cost-effective to build enough storage for 6 hours of grid load.
This gets rid of baseload coal and gas peakers, and reduces gas to a role of occasional backup.
Don't forget, that as well as rooftop solar (yellow), there's solar farms (dark yellow), and wind (green) which does more at night.
This gets rid of baseload coal and gas peakers, and reduces gas to a role of occasional backup.
Don't forget, that as well as rooftop solar (yellow), there's solar farms (dark yellow), and wind (green) which does more at night.
Here's "someone" bringing up Germany in a thread about nuclear and renewables in Australia.
March 19, 2025 at 1:11 AM
Here's "someone" bringing up Germany in a thread about nuclear and renewables in Australia.
Over the last year, Australia's east coast grid was 39.8% renewables; and getting cleaner every year.
A BEV charged from the grid will get cleaner every year.
A petrol (or hybrid) car is dirty, and will stay dirty.
PS. Many BEV owners charge from their rooftop solar, not the grid.
A BEV charged from the grid will get cleaner every year.
A petrol (or hybrid) car is dirty, and will stay dirty.
PS. Many BEV owners charge from their rooftop solar, not the grid.
March 6, 2025 at 4:51 PM
Over the last year, Australia's east coast grid was 39.8% renewables; and getting cleaner every year.
A BEV charged from the grid will get cleaner every year.
A petrol (or hybrid) car is dirty, and will stay dirty.
PS. Many BEV owners charge from their rooftop solar, not the grid.
A BEV charged from the grid will get cleaner every year.
A petrol (or hybrid) car is dirty, and will stay dirty.
PS. Many BEV owners charge from their rooftop solar, not the grid.
From the article.
Look at the picture.
"Heat sink" x2
That is where the vast amounts of water can be consumed.
Look at the picture.
"Heat sink" x2
That is where the vast amounts of water can be consumed.
February 17, 2025 at 9:54 AM
From the article.
Look at the picture.
"Heat sink" x2
That is where the vast amounts of water can be consumed.
Look at the picture.
"Heat sink" x2
That is where the vast amounts of water can be consumed.
I think your assumption is faulty.
For instance, David's model has ~20% curtailed generation.
There's no intrinsic supply shortfall.
It's then a tradeoff on spending more on storage vs a couple % of Other generation.
For instance, David's model has ~20% curtailed generation.
There's no intrinsic supply shortfall.
It's then a tradeoff on spending more on storage vs a couple % of Other generation.
February 6, 2025 at 12:39 AM
I think your assumption is faulty.
For instance, David's model has ~20% curtailed generation.
There's no intrinsic supply shortfall.
It's then a tradeoff on spending more on storage vs a couple % of Other generation.
For instance, David's model has ~20% curtailed generation.
There's no intrinsic supply shortfall.
It's then a tradeoff on spending more on storage vs a couple % of Other generation.
Ooh. Neat.
I used one of those at home for a few months plugged into an ICL KDS terminal (similar to ⬇️).
Then swapped to a 1200/75 bps modem. Speed!
I used one of those at home for a few months plugged into an ICL KDS terminal (similar to ⬇️).
Then swapped to a 1200/75 bps modem. Speed!
February 4, 2025 at 1:29 AM
Ooh. Neat.
I used one of those at home for a few months plugged into an ICL KDS terminal (similar to ⬇️).
Then swapped to a 1200/75 bps modem. Speed!
I used one of those at home for a few months plugged into an ICL KDS terminal (similar to ⬇️).
Then swapped to a 1200/75 bps modem. Speed!
"An FCEV requires over twice as much energy as a BEV to drive the same distance"
Sure, the fall in cost of Green Hydrogen will follow the fall in cost of Green Electrons,
but if a FCEV needs 2x or 2.5x as much electricity (and electricity infrastructure) as a BEV, the BEV will be cheaper to run.
Sure, the fall in cost of Green Hydrogen will follow the fall in cost of Green Electrons,
but if a FCEV needs 2x or 2.5x as much electricity (and electricity infrastructure) as a BEV, the BEV will be cheaper to run.
January 6, 2025 at 12:37 AM
"An FCEV requires over twice as much energy as a BEV to drive the same distance"
Sure, the fall in cost of Green Hydrogen will follow the fall in cost of Green Electrons,
but if a FCEV needs 2x or 2.5x as much electricity (and electricity infrastructure) as a BEV, the BEV will be cheaper to run.
Sure, the fall in cost of Green Hydrogen will follow the fall in cost of Green Electrons,
but if a FCEV needs 2x or 2.5x as much electricity (and electricity infrastructure) as a BEV, the BEV will be cheaper to run.
There are 2 different issues here.
Hydrogen made via electrolysis is much more expensive than made from steam reforming of Methane.
Electricity from new renewables is cheaper than electricity from new coal or nuclear plants.
Hydrogen made via electrolysis is much more expensive than made from steam reforming of Methane.
Electricity from new renewables is cheaper than electricity from new coal or nuclear plants.
January 5, 2025 at 11:13 PM
There are 2 different issues here.
Hydrogen made via electrolysis is much more expensive than made from steam reforming of Methane.
Electricity from new renewables is cheaper than electricity from new coal or nuclear plants.
Hydrogen made via electrolysis is much more expensive than made from steam reforming of Methane.
Electricity from new renewables is cheaper than electricity from new coal or nuclear plants.
Take South Australia as harbinger of the future.
Look at electricity supply over the last 3 days
explore.openelectricity.org.au/energy/sa1/?...
What's the grid "baseload" demand?
On Sunday afternoon *more* electricity was generated by rooftop solar (yellow) than needed to power the whole state.
Look at electricity supply over the last 3 days
explore.openelectricity.org.au/energy/sa1/?...
What's the grid "baseload" demand?
On Sunday afternoon *more* electricity was generated by rooftop solar (yellow) than needed to power the whole state.
December 24, 2024 at 1:29 AM
Take South Australia as harbinger of the future.
Look at electricity supply over the last 3 days
explore.openelectricity.org.au/energy/sa1/?...
What's the grid "baseload" demand?
On Sunday afternoon *more* electricity was generated by rooftop solar (yellow) than needed to power the whole state.
Look at electricity supply over the last 3 days
explore.openelectricity.org.au/energy/sa1/?...
What's the grid "baseload" demand?
On Sunday afternoon *more* electricity was generated by rooftop solar (yellow) than needed to power the whole state.
I think it is obvious that nuclear has missed the current baseload -> VRE transition.
IFF and when nuclear can get its act into gear and start delivering projects on ~time and ~budget and at reasonable cost,
then it could have a role in the next transition.
IFF and when nuclear can get its act into gear and start delivering projects on ~time and ~budget and at reasonable cost,
then it could have a role in the next transition.
December 23, 2024 at 2:11 AM
I think it is obvious that nuclear has missed the current baseload -> VRE transition.
IFF and when nuclear can get its act into gear and start delivering projects on ~time and ~budget and at reasonable cost,
then it could have a role in the next transition.
IFF and when nuclear can get its act into gear and start delivering projects on ~time and ~budget and at reasonable cost,
then it could have a role in the next transition.
And rotary phones in NZ back then had the numbers in the wrong order.
Completely "wrong" to e.g. dial 9 and hear just one click on the line.
Completely "wrong" to e.g. dial 9 and hear just one click on the line.
December 8, 2024 at 10:47 PM
And rotary phones in NZ back then had the numbers in the wrong order.
Completely "wrong" to e.g. dial 9 and hear just one click on the line.
Completely "wrong" to e.g. dial 9 and hear just one click on the line.
I guess I'm less likely to post angry than on the other site ...
December 4, 2024 at 1:51 AM
I guess I'm less likely to post angry than on the other site ...
*Definitely* set a custom price notification!
Also it really helps to have a battery to store solar to cover the price peaks.
Also it really helps to have a battery to store solar to cover the price peaks.
December 2, 2024 at 9:24 PM
*Definitely* set a custom price notification!
Also it really helps to have a battery to store solar to cover the price peaks.
Also it really helps to have a battery to store solar to cover the price peaks.
Have a look at South Australia as an indicator of what other states might look like in the future.
explore.openelectricity.org.au/energy/sa1/
When there is lots of rooftop solar -> fossil fuels, solar farms, wind farms have benn squeezed out of the market; and the price has gone negative.
explore.openelectricity.org.au/energy/sa1/
When there is lots of rooftop solar -> fossil fuels, solar farms, wind farms have benn squeezed out of the market; and the price has gone negative.
December 2, 2024 at 9:18 PM
Have a look at South Australia as an indicator of what other states might look like in the future.
explore.openelectricity.org.au/energy/sa1/
When there is lots of rooftop solar -> fossil fuels, solar farms, wind farms have benn squeezed out of the market; and the price has gone negative.
explore.openelectricity.org.au/energy/sa1/
When there is lots of rooftop solar -> fossil fuels, solar farms, wind farms have benn squeezed out of the market; and the price has gone negative.
I'm with Amber Electricity.
They pay wholesale spot market prices for exported electricity.
When the spot price and hence feed in tariff is negative, their SmartShift tells my inverter to curtail export to zero.
They pay wholesale spot market prices for exported electricity.
When the spot price and hence feed in tariff is negative, their SmartShift tells my inverter to curtail export to zero.
December 2, 2024 at 8:27 PM
I'm with Amber Electricity.
They pay wholesale spot market prices for exported electricity.
When the spot price and hence feed in tariff is negative, their SmartShift tells my inverter to curtail export to zero.
They pay wholesale spot market prices for exported electricity.
When the spot price and hence feed in tariff is negative, their SmartShift tells my inverter to curtail export to zero.
Or ... how about...
** We cut the amount of gas we use **
Europe had a gas crisis starting with reduced supply in 2021, and made huge strides in cutting gas use.
It can be done!
ec.europa.eu/eurostat/web...
** We cut the amount of gas we use **
Europe had a gas crisis starting with reduced supply in 2021, and made huge strides in cutting gas use.
It can be done!
ec.europa.eu/eurostat/web...
December 2, 2024 at 7:29 AM
Or ... how about...
** We cut the amount of gas we use **
Europe had a gas crisis starting with reduced supply in 2021, and made huge strides in cutting gas use.
It can be done!
ec.europa.eu/eurostat/web...
** We cut the amount of gas we use **
Europe had a gas crisis starting with reduced supply in 2021, and made huge strides in cutting gas use.
It can be done!
ec.europa.eu/eurostat/web...
The kicker is at the end.
"In contrast, emissions from fossil fuel production have increased materially and now represents about 20% of Australia’s total emissions, or more like 24% if we account for the likely underreporting of methane emissions."
WTF!!
"In contrast, emissions from fossil fuel production have increased materially and now represents about 20% of Australia’s total emissions, or more like 24% if we account for the likely underreporting of methane emissions."
WTF!!
December 2, 2024 at 3:27 AM
The kicker is at the end.
"In contrast, emissions from fossil fuel production have increased materially and now represents about 20% of Australia’s total emissions, or more like 24% if we account for the likely underreporting of methane emissions."
WTF!!
"In contrast, emissions from fossil fuel production have increased materially and now represents about 20% of Australia’s total emissions, or more like 24% if we account for the likely underreporting of methane emissions."
WTF!!
Ready for our first visitor...
November 30, 2024 at 11:28 PM
Ready for our first visitor...
Preparing for Airing of the Quilts
November 30, 2024 at 10:29 PM
Preparing for Airing of the Quilts