[Manuel_D]

No, almost all of our ammonia is produced via the Haber process which emits carbon dioxide. Less than a tenth of one percent of our hydrogen is produced via green hydrogen:

> As of 2021, green hydrogen accounted for less than 0.04% of total hydrogen production. Its cost relative to hydrogen derived from fossil fuels is the main reason green hydrogen is in less demand. For example, hydrogen produced by electrolysis powered by solar power was about 25 times more expensive than that derived from hydrocarbons in 2018.

https://en.wikipedia.org/wiki/Green_hydrogen

[hef19898]

I said we mist roll it out at scale, didn't I? The tech is there, and it works, now we have to build it.

You know, like Musk did with EVs and charging networks.

[Manuel_D]

And as per the article, it's 25 times more expensive than existing hydrogen sources.

By comparison, the economics nuclear powered ships are not that much worse than conventional propulsion: https://en.wikipedia.org/wiki/NS_Savannah#Economics_of_nucle...

[hef19898]

Of course not. The right mix is important.

But honestly, I reached the point where I claim the same "just build it" approach the pro-nuclear crowd is using regardless of data and facta. Especially since I know from a project I was involved in before COVID hit, that green hydrogen produced PV is absolutely feasible and commercially viable. To do so at tue scale needed requires political action and subsidies, and the tech has still a lot of room for improvement. I say this is good news.

[Manuel_D]

> Especially since I know from a project I was involved in before COVID hit, that green hydrogen produced PV is absolutely feasible and commercially viable.

It'd be really great to link to that project and actually demonstrate this claim of commercial viability. We have at least one demonstration of a nuclear powered merchant ship operating over the span of a decade. Can we say the same for a green-fuel powered vessel?

[hef19898]

Regarding a ship running on LNG:

https://www.ship-technology.com/projects/viking-energy-cargo...

The same vessel will be launched early next year with an ammonia fuel cell.

LNG can be produced using green energy, the actual engine doesn't care how the fuel was produced.

Regarding the green hydrogen project: it was a proposed pilot production site to produce green hydrogen. And the business case was actually positive. No idea where that project is now, tuey needed EU funding and that was hard to come by during Covid. And after, I stopped being a freelance consultant.

[defrost]

Liquified Gas can be produced using green energy, Natural gas was produced via "green energy" a very very very long time ago.

There are several green gas projects under way - capital plants take time - eg. the Gibson Island project won't be online and producing until 2026.

https://fortescue.com/what-we-do/our-projects/gibson-island

[Manuel_D]

Ships running off natural gas are nothing new. LNG carriers have been propelled by natural gas for decades. The real challenge is producing carbon-neutral natural gas, which your link says nothing about.

Synthetic natural gas has all the same problems as green hydrogen, with the added challenge of sequestering carbon from the atmosphere. It's only been cheaply produced using byproduct CO2 from industrial processes. Which isn't actually carbon-neutral, it's just using CO2 that would have been released into the atmosphere anyway.