Green Energy

What makes a tech mature to you?

When significant issues have been worked out and it is, if not profitable, economically justifiable.

solarpunk is anti-capitalist, so profitability shouldn’t be among our primary concerns

I'm not primarily concerned with a Lemmy instance, I'm more focused on the world that we live in.

That’s a worst case figure for purely electrical round trip efficiency. We could use waste heat of the fuel cell process (to a lesser extent also the electrolysis process) in order to bump that number up considerably.

It's a reasonable estimate, not a worst-case figure, and waste heat works well when additional heat is required and incredibly poorly when it is not. Heat storage is also an alternative but now we're talking about requiring heat storage in order to make hydrogen viable, which bumps up the cost and reduces availability even further.

That has not been an issue for quite some time thanks to advances in materials science.

So this is not entirely true, leakage represents about 2.9-5.6% and hydrogen is an indirect greenhouse gas that can potentially have a 10 times bigger impact than CO2 over a 100-year period. Let's not fix problems by potentially causing more problems.

Lithium-ion batteries are environmentally bad for sure, but talking about thermal runaway? Really? You need very high temperatures for that to happen.

All that you need is bad luck with dendrite formation and the battery can combust during regular cycling. An energy storage facility in Australia caught fire a few years ago. The ship off the coast of the Netherlands that burned just weeks ago was potentially caused by brand new EV batteries combusting. It is a significant concern.

It’s really a non-issue if you have engineers who know what they’re doing working on it.

I am an engineer.

Coming bad to environmentally bad: see sodium-ion batteries.

What do you mean by "Coming bad to environmentally bad"? I think sodium-ion batteries represent an exciting step forward in battery development since it would reduce the need for a material which is often environmentally disastrous to extract. There are also other storage mediums that are developing, Liquid- and Compressed Air Energy Storage, Flow Batteries, and Liquid Metal batteries to mention a few. There's also the rust battery that's under development by Form Energy. I don't know why people get so hung up on hydrogen and lithium-ion batteries as if they're the only two possible alternatives when at least one of them sacrifices safety and longevity for weight in a use-case where weight isn't an issue.

I am interested in the tech, I'm trying to keep up to date with recent developments as it's both interesting and in the same field as my degree, and I do think that it's both inevitable that it will end up as the best alternative for the grid in the future and that there are exciting opportunities today. But we don't have to ignore risks and cram other technologies into there just because fossil fuels are bad, we can phase them out and make right decisions for the future at the same time.