“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.”

  • PersnickityPenguin@lemm.ee
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    1 year ago

    You’re right; 2/3 of worldwide energy is actually waste heat.

    image

    https://www.businessinsider.com/most-energy-still-comes-from-oil-2015-10

    Here’s the chart from 2007: Waste heat / losses are in the top right, although it doesn’t show the transport sector losses which are higher than for coal generation.

    image

    What this means is that when we fully electrify all sectors, by using renewable energy such as wind and solar, our total energy generation capacity will only need to be about 1/3 to 1/4 of what we currently produce today to fulfill our current energy needs. That’s huge.

      • PersnickityPenguin@lemm.ee
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        1 year ago

        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
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          1 year ago

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

      • thesorehead@lemmy.world
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        1 year ago

        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!

        • cucumber_sandwich@lemmy.world
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          1 year ago

          Yes of course, but a lot of energy is currently also used for heating things in cooking steel, chemical industry, concrete, etc. Those processes need energy as heat and directly produce waste heat. I agree it’s probably still significant. It’s just wrong to reduce energy consumption to “making things move”.

        • masterofn001@lemmy.ca
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          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