this post was submitted on 18 Nov 2023
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‘Energy independent’ Uruguay runs on 100% renewables for four straight months (theprogressplaybook.com)
submitted 1 year ago by kalkulat@lemmy.world to c/technology@lemmy.world
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"with wind the single-biggest contributor.... Power production costs have declined “by almost half” .... And the clean energy sector has created 50,000 new jobs.... Ask me what was the impact on the electricity sector in Uruguay after this tragic war in Europe — zero."

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[–] PersnickityPenguin@lemm.ee 20 points 1 year ago (2 children)

You're right; 75% to 80% of worldwide energy is actually waste heat.

[–] cucumber_sandwich@lemmy.world 4 points 1 year ago (2 children)

Correct me if I'm wrong, but electrifying a process doesn't automatically make it not produce waste heat, right?

[–] thesorehead@lemmy.world 2 points 1 year ago (1 children)

The reference to waste heat could include the heat from burning fossil fuels that isn't turned directly into work. Which is a lot.

So you're right, there will still be some waste heat and the reduction in production needs won't be that drastic. But it's still a significant chunk of the total!

[–] masterofn001@lemmy.ca 0 points 1 year ago

Converting energy to power will always produce at least one of heat or light (also radiant heat) in the process.

There is no 100% efficient power.

But, electric is the closest you could get. Especially compared to any petroleum products

[–] PersnickityPenguin@lemm.ee 1 points 1 year ago (1 children)

Changing your energy generation from burning something to turning a turbine with wind power, hydropower or geothermal power. Or just using solar, means that you have no waste heat for electrical generation.

Waste heat is only created when you burn a fuel to boil the water.

[–] cucumber_sandwich@lemmy.world 1 points 1 year ago

If you heat things electrically you still generate waste heat. Think electrical stove and its bigger industrial counterparts.

[–] Lancoian@lemmy.world 3 points 1 year ago

that's not quite right and mixes couple things

you have production losses and transmission losses. then you have waste heat used for household and industrial heating.

now you would also have to produce that portion electrically.

For instance in winter heating requirements of a typical house are 2x that of the electricity used.