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James Glynn

@drglynn.bsky.social

Founder CEO, Adjunct Professor of Energy Engineering Purpose driven, building open source energy systems frameworks for strategic decision optimisation. Leveraging 50 years of institutional knowledge in the #IEA #ETSAP #TIMES code.

22 Posts1511 Follower655 Folgt
Green Collective@greencollective.io · 2w ago

Electricity generation in Ireland over the summer has historically been dominated by fossil fuels. But, that's changing: solar and batteries (along with imports) are gradually displacing gas generation. It won't be long before we see a summer month with mostly renewable generation.

A bar chart of electricity generation on the island of Ireland for June months between 2019 and 2026, inclusive. Each year has two bars: a green one for renewable generation, and a grey one for fossil fuels. Footnote reads: All-island figures. Renewables comprise wind, hydro, solar, and biomass. Storage comprises batteries and pumped hydro. Fossil fuels comprise coal, gas, oil, and waste-to-energy. Source: EirGrid, SEMO
Observable@observablehq.com · 3w ago

Here @fil.rezo.net reproduces @climatecasino.net’s chart, using warped gridlines to represent both the absolute temperature and the deviation from the historical mean for each day of the year. new.observablehq.com/@fil/godzill...

A line chart with an x-axis showing days of the year, from start of January to end of December; a left y-axis showing temperature, from 22 to 31 ºC; and a right axis showing deviation, from -3σ to 4σ. An orange line shows the mean, starting the year around 26.3 ºC and peaking in May around 27.8 ºC. Faint blue lines show a huge amount of historical data. A bold red line representing 2026 begins the year below the mean, just below 26 ºC, and continues to present day far above the mean, 29.4 ºC. Gray gridlines get “pinched” in the middle, representing narrower summer deviations, highlighting that the current temperature is almost 3.5σ above the mean.
Prof. Eliot Jacobson@climatecasino.net · 4w ago

Breaking News! Code: y-axis alert. Nino 3.4 SST is now up to 3.63 SD above the 1991-2020 baseline, about 1-in-7000 in the absence of anthropogenic warming. There's not enough room in a single post to express just how crazy this is. Please read: climatecasino.substack.com/p/some-monst...

Zeke Hausfather@zekehausfather.com · last mo.

The global surface temperature record is one of the most iconic figures in climate science. We now have 12 different groups of researchers from the US, UK, EU, Japan, and China (among others) that have calculated it and found nearly identical results:

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Green Collective@greencollective.io · last mo.

Ireland enjoyed clear, sunny skies on Sunday for the summer solstice ☀️ On the grid, winds and imports were low. This resulted in relatively little congestion, allowing solar farms handle over 30% of the island's electricity needs for a solid six hours straight -- a first on the Irish grid ☘️ 📊

A stacked area chart of the renewable electricity generation mix on the island of Ireland with the following fuel types: battery, pumped storage, biomass, waste-to-energy, hydro, solar, wind, and gas. The y axis indicates the percentage of demand being met by each source. Footnote reads: All-island figures. Excludes rooftop solar. Source: EirGrid, SEMOA map of Ireland with markers representing generation and dispatch down at solar farms. Markers are sized in proportion to the total available power at each farm and are divided in three segments: generation, energy lost to curtailment, and energy lost to transmission constraints. Footnote reads: All-island figures. Excludes solar farms not registered with SEMO. Excludes rooftop solar. Source: SEMO
Green Collective@greencollective.io · 2mo ago

Trust us, the current European heatwave is no joke 🥵 However, clear skies and long days are good for capturing power from the sun: as of 4pm this afternoon, solar farms had been meeting >30% of the ROI's electricity needs for several hours ☀️ This kind of share for solar is all new this summer 📊

A stacked area chart of the renewable electricity generation mix on the island of Ireland with the following fuel types: battery, pumped storage, biomass, waste-to-energy, hydro, solar, wind, and gas. The y axis indicates the percentage of demand being met by each source. Footnote reads: Republic of Ireland figures. Excludes rooftop solar. Source: EirGrid, SEMOA treemap of the electricity mix on the island of Ireland with the following fuel types: battery, pumped storage, biomass, hydro, solar, wind, gas, and waste-to-energy. Larger sources are annotated with the GWh and percentage of total generation that source comprised. Footnote reads: Republic of Ireland figures. Excludes rooftop solar. Source: EirGrid, SEMO
Green Collective@greencollective.io · 2mo ago

Irish electricity is getting cleaner and cleaner ⚡️ In May, the gap between renewable and fossil fuel generation was narrower than ever before for a summer month ☀️ How? Read the full story in the latest "Irish Grid Monthly", available now to all our newsletter subscribers. #SpéirGhorm #EnergySky

A bar chart of electricity generation on the island of Ireland for May months between 2019 and 2026, inclusive. Each year has two bars: a green one for renewable generation, and a grey one for fossil fuels. Footnote reads: All-island figures. Renewables comprise wind, hydro, solar, and biomass. Fossil fuels comprise coal, gas, oil, and waste-to-energy. Source: EirGrid, SEMO
Green Collective@greencollective.io · 2mo ago

Ireland saw exceptionally strong solar generation over the weekend as a heat dome descended over Europe. The charts below illustrate not-insignificant dispatch down, with transmission constraints dominating in Northern Ireland and significant curtailment in the east and south coasts.

A stacked area chart of solar power availability on the island of Ireland divided into three categories: generation, dispatch down due to transmission constraints, and dispatch down due to curtailment. Footnote reads: All-island figures. Excludes solar farms not registered with SEMO. Excludes rooftop solar. Source: SEMOA map of Ireland with markers representing generation and dispatch down at solar farms. Markers are sized in proportion to the total available power at each farm and are divided in three segments: generation, energy lost to curtailment, and energy lost to transmission constraints. Footnote reads: All-island figures. Excludes solar farms not registered with SEMO. Excludes rooftop solar. Source: SEMO
Green Collective@greencollective.io · 2mo ago

We literally just posted about yesterday's solar records before seeing another has already been broken, with output reaching 1263MW (~25% of electricity demand at the time) just before noon. We'll have more on this but just a little reminder that you can follow these in real-time on our website.

A chart showing a historical solar records on the island of Ireland. Output is in orange and output to demand ratio in blue. Records are indicated with a large circle and the time between with dashed lines. Footnote reads: All-island figures. Excludes rooftop solar. Source: EirGrid 15-minute SCADA readings
Glen Peters@glenpeters.bsky.social · 3mo ago

Back in 2012 we did a figure comparing historical emissions to previous generations of emission scenarios. rdcu.be/brDGx Surprisingly, the figure is still doing the rounds. We update it every year, with many interesting changes primarily due to revisions in land-use change emissions. 1/

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International Energy Agency@iea.org · 4mo ago

The Middle East conflict has largely halted shipping via the Strait of Hormuz, impacting the trade of a wide range of energy products Our new interactive tool shows how oil & gas tanker traffic, as well as other cargo ships, has changed in recent weeks 👉 iea.li/4bGgoiT

Auke Hoekstra@aukehoekstra.bsky.social · 5mo ago

This idiotic Iran war is also the biggest gift Trump could have given his buddy Putin. Literally hundreds of billions will flow from our coffers into Putin's now. It dwarfs any aid the US has given Zelensky. The US is doing such incredible damage worldwide at the moment! On purpose?

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Green Collective@greencollective.io · 5mo ago

A closer look at Friday, which saw an unprecedented *two* major records broken on the Irish grid in a single day: battery discharge and solar output. Batteries met roughly 4.5% of the morning peak load, while solar met almost 7% of the entire day's demand 🔋 ☀️

A stacked area chart of the electricity generation mix on the island of Ireland with the following fuel types: battery, pumped storage, biomass, waste-to-energy, hydro, solar, wind, oil, and gas. There is also a black line showing electricity demand. Footnote reads: All-island figures. Excludes rooftop solar. Source: EirGrid, SEMOA treemap of the electricity mix on the island of Ireland with the following fuel types: battery, pumped storage, biomass, hydro, solar, wind, oil, gas, and waste-to-energy. Larger sources are annotated with the GWh and percentage of total generation that source comprised. Footnote reads: All-island figures. Excludes rooftop solar. Source: EirGrid, SEMO
Green Collective@greencollective.io · 5mo ago

🚨 No need to wait for our next newsletter! As we predicted just last weekend in the premium edition of "Irish Grid Monthly", solar output on the island of Ireland reached a new all-time high yesterday: 889MW, equal to 17.5% of electricity demand at 1.15pm. 🥇 ☀️

An extract from our most recent newsletter which reads: That's five new solar farms in total so far this winter, raising the island's capacity from 1,095MW in summer of 2025 to 1525.5MW as of March 1, 2026. Assuming dispatch down doesn't escalate, we should again see ~50% year-on-year growth as we have over the past few years. Last year, we correctly predicted a "solar record season" running March-September. This record season has been slowly expanding, too, so with all this new capacity, we predict a new solar record in the first half of March 2026. We'll let you know in the next newsletter!A stacked area chart of the electricity generation mix on the island of Ireland with the following fuel types: battery, pumped storage, biomass, waste-to-energy, hydro, solar, wind, oil, and gas. There is also a black line showing electricity demand. Footnote reads: All-island figures. Excludes rooftop solar. Source: EirGrid, SEMOA stacked area chart of the renewable electricity generation mix on the island of Ireland. There are eight fuel types: pumped storage, biomass, waste-to-energy, hydro, solar, wind, oil, and gas. The y axis indicates the percentage of demand being met by each source. Footnote reads: All-island figures. Excludes rooftop solar. Source: EirGrid, SEMO
Jan Rosenow@janrosenow.bsky.social · 6mo ago

Will AI and data centres be the main drivers of future electricity demand? No. The biggest drivers will be the electrification of industry, transport and buildings. When powered by clean electricity, the benefits are fundamental: vastly higher efficiency, dramatically lower emissions & cleaner air.

What If Galway@what-if-galway.bsky.social · 6mo ago

Interesting to see how this pans out "Galway City Council is intent on progressing a pedestrian and bicycle link across the stone abutments of the former Clifden Railway Bridge, despite national funding cancelled for this piece of the Connemara Greenway" www.advertiser.ie/galway/artic...

Council aims to bridge funding gap

Galway City Council is intent on progressing a pedestrian and bicycle link across the stone abutments of the former Clifden Railway Bridge, despite national funding cancelled for this piece of the Con...

advertiser.ie

What If Galway@what-if-galway.bsky.social · 6mo ago

Assuming a ring road is in place by 2040, the report suggests a short-term alleviation of traffic flow in the city centre after 2030. “However, increased transport demand will eventually result in the bypass becoming congested without further intervention,” the report warns.

Expect soaring congestion costs

A long-anticipated report into congestion across Irish cities has been circulated several months after its publication, and its findings for Galway city are damning.

advertiser.ie

International Energy Agency@iea.org · 7mo ago

Export restrictions introduced since April 2025 have pushed rare earth prices up sharply in importing countries European prices reached up to six times higher than in China, making rare earth products manufactured outside China far less cost-competitive 👉 iea.li/4oPKO7D

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Green Collective@greencollective.io · 8mo ago

Renewable generation and discharging storage equalled 73% of yesterday's electricity demand, with a peak of 87% at 05:00. Fossil fuel generation (mostly gas) equalled 25% of demand. 3% of generation was exported, 5% of demand was met by imports.

A stacked area chart of the electricity generation mix on the island of Ireland with the following fuel types: battery, pumped storage, biomass, waste-to-energy, hydro, solar, wind, oil, and gas. There is also a black line showing electricity demand. Footnote reads: All-island figures. Excludes domestic solar. Source: EirGrid, SEMO