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James Twallin @twallinjames.bsky.social · 22h

Link to survey: www.gov.uk/government/p...

National Transmission System hydrogen blending: study

The project sets out analysis on the potential impacts of hydrogen blending in the national transmission system (NTS) at blend percentages of up to 2%, 5% and 20%.

www.gov.uk

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James Twallin @twallinjames.bsky.social · 22h

Why?

Hydrogen has 1/3 the energy density of natural gas. Sites reported reduced power output, 2-6 year modification lead times, combustion instabilities, safety concerns from embrittlement/leakage, and increased NOx emissions.

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James Twallin @twallinjames.bsky.social · 22h

This "breakthrough" appears to use a brand new hydrogen-specific turbine installed last year - not existing infrastructure.

A govt-commissioned Arup survey of existing UK gas stations tells a different story: Almost all reported significant challenges accepting blended hydrogen:

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James Twallin @twallinjames.bsky.social · 22h

Energy companies injected green hydrogen into Britain's gas grid and generated electricity - a "landmark development for the UK's climate ambitions."

So we can just use blended hydrogen to power our old gas turbines? Problem solved?

Not quite.

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Reposted by James Twallin

Farrukh @implausibleblog.bsky.social · 9d

Zack Polanski, "Reform UK's Zia Yusuf was full of b*llocks and I think it was important to call that out on #BBCQT"

"What has become clear about Reform UK, they're a bunch of cowards"

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James Twallin @twallinjames.bsky.social · 13d

Steady state is a hangover from fossil fuels, but when electricity changes in both cost and carbon, we need to account for thermal mass and use it as a store.

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James Twallin @twallinjames.bsky.social · 13d

Personally I'd throw both MCS's heat loss calculator and SAP's methodology into the fire.

Both are very static and hopelessly out of date.

My main issue with MCS's approach is the lack of thermal mass consideration and insistence on steady state heating.

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James Twallin @twallinjames.bsky.social · 13d

Brits are using less energy to heat their homes

It's a key input for heat pump design in the MCS heat loss calculator (well it's a lookup). See here: lnkd.in/ebMeZgXG. A quick eyeball of the figures in that table seems to indicate an update is well overdue!

This link will take you to a page that’s not on LinkedIn

lnkd.in

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James Twallin @twallinjames.bsky.social · 13d

If you've not seen the concept of a 'heating degree day' before, it's pretty simple. You take 15.5°C and subtract the average daily temperature. HDD has a floor of 0.

For example. -2°C becomes 17.5HDD. 22°C is 0HDD (since it is above 15.5°C).

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James Twallin @twallinjames.bsky.social · 13d

In the plots below, I've summed up the total HDD for each year. I've then compared some 30 years periods (1940 to 1969 and 1995 to 2024). It's not just a little bit warmer in the winter. It's significantly wamer.

National parks chosen free from the 'heat island' effect that naysayers love.

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James Twallin @twallinjames.bsky.social · 20d

Based on NHS procurement costs

James Twallin @twallinjames.bsky.social · 20d

More evidence of gas leaks at Seabank Power Station

Why is £22bn of taxpayers' money being allocated to carbon capture when methane leaks are clearly not under control at our power stations?

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James Twallin @twallinjames.bsky.social · 23d

I did some back of the envelope calculations, and based on the aperture size and the pressure, I estimate something on the order of 1 million tonnes of CO2eq.

James Twallin @twallinjames.bsky.social · 23d

That's what you're seeing. It's choked flow, meaning the gas is coming out at supersonic speeds. Moving from high pressure to low pressure very quickly, it's cooling down.

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James Twallin @twallinjames.bsky.social · 23d

www.whatdotheyknow.com/request/gas_...

Definitely methane

Gas leak - Romsey area of Hampshire - a Freedom of Information request to Scotia Gas Networks Limited

I am writing to make a request under the Environmental Information Regulations 2004 (EIR) regarding the high pressure gas pipeline leak that occurred in the Romsey area of Hampshire on 16 July 2024 (h...

www.whatdotheyknow.com

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James Twallin @twallinjames.bsky.social · 23d

They've not paid a penalty as far as I'm aware.

If you're interested in some detail, here's the FOI attached. I've referred to the ICO.

www.whatdotheyknow.com/request/gas_...

Gas leak - Romsey area of Hampshire - a Freedom of Information request to Scotia Gas Networks Limited

I am writing to make a request under the Environmental Information Regulations 2004 (EIR) regarding the high pressure gas pipeline leak that occurred in the Romsey area of Hampshire on 16 July 2024 (h...

www.whatdotheyknow.com

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Reposted by James Twallin

Jan Rosenow @janrosenow.bsky.social · 24d

In 2005 I spent 5 months in Ecuador investigating oil extraction.

Around then German bank WestLB funded a new Andes pipeline despite past spills.

What I saw was shocking and mostly unseen. This 2022 video shows just one example of repeated spills poisoning rivers and communities.

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James Twallin @twallinjames.bsky.social · 26d

Look at the FOI. Nothing happens.

James Twallin @twallinjames.bsky.social · 26d

Read the correspondence on my FOI between the Environment Agency and seabank power station, you'll see that nothing happens. There's a collective shrug and things continue as they were.

Dan Grey @dangrey.bsky.social · 26d

GHGSat is a private company; they need revenue to pay for those satellites
bsky.app/profile/dang...

Dan Grey @dangrey.bsky.social · Mar 27

Yet another(!) is GHGSat but unlike the others this is a commercial start-up founded in 2011. It flies a fleet of greenhouse gas-detecting satellites, including ones mapping methane. The European Space Agency and the UK Space Agency both buy data from them to make available to researchers e.g.

James Twallin @twallinjames.bsky.social · 26d

"GHGSat is a private company; they need revenue to pay for those satellites" - did I say they didn't?

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James Twallin @twallinjames.bsky.social · 26d

it is cheaper to put a few satellites into space than to fix leaks.

James Twallin @twallinjames.bsky.social · 26d

Also - read the correspondence between the Environment Agency and the power station, you'll see that nothing happens. There's a collective shrug and things continue as they were.

James Twallin @twallinjames.bsky.social · 26d

unfortunately, this is all my work trying extract the data FROM GHGSAT. They don't share the data. They don't make the data available freely. I've only been able to make the data public via a freedom of information request.

Unfortunately, until I see otherwise, GHGSat is a PR exercise.

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James Twallin @twallinjames.bsky.social · 26d

CCS is a delay tactic to slow electrification.

£22 billion is being funnelled into this dead end.

The simple answer is electrification, efficiency and allocating public money on sensible stuff.

FOI here: www.whatdotheyknow.com/request/free...

Freedom of Information Request - Gas Leaks and Emissions at UK Power Stations - a Freedom of Information request to Environment Agency

Under the Freedom of Information Act 2000, I request the following information for the period January 2020 to present: 1. All records of gas leaks and emissions incidents at UK gas turbine power stat...

www.whatdotheyknow.com

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James Twallin @twallinjames.bsky.social · 26d

This is a methane plume detected over a seabank power station. I had to extract this image via a freedom of information request.

Fossil fuel companies will tell you that they can safely bury carbon dioxide from burning gas. How? They're not even handling methane competently.

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