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silence7@slrpnk.net to Green Energy@slrpnk.netEnglish · 1 year ago

Renewables cover more than half of Germany’s electricity demand for first time this year

www.cleanenergywire.org

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Renewables cover more than half of Germany’s electricity demand for first time this year

www.cleanenergywire.org

silence7@slrpnk.net to Green Energy@slrpnk.netEnglish · 1 year ago
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  • silence7@slrpnk.netOP
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    1 year ago

    To be clear: you only need to replace the final energy from the fuel, not the primary energy. That’s a big deal, because it reduces the amount you need to replace sharply.

    • MrMakabar@slrpnk.net
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      1 year ago

      You need to replace the useful energy of the fuel and not the final nor the primary energy. For a combustion engine car the primary energy would be the energy in the oil, final energy would be the petrol you buy at the pump and useful energy the kinetic energy of the car. Since a combustion engine of a car is extremely inefficient, that makes a massive difference.

      • silence7@slrpnk.netOP
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        1 year ago

        Yeah, that’s a better definition than final energy

      • Maëlys@slrpnk.net
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        1 year ago

        A lithium-ion battery pack has about 0.3 MJ/kg and about 0.4 MJ/liter (Chevy VOLT). Gasoline thus has about 100 times the energy density of a lithium-ion battery.

        gasoline is 100 time more energy dense than electricity, thus even inefficiencies at 70% for IC engines, gasoline would still be more dense somehow. But there is alot of geopolotics and environement issues involved with fuel. The problem of energy density needs to be resolved for electricity so it would be more convenient to use, even at the industrial scale, which is a major carbon emitter.

        • MrMakabar@slrpnk.net
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          1 year ago

          The article is from August/September 2012

          The issue is that ICs just suck badly. So badly that carrying around half a ton of batteries still makes EVs much more efficent. that is not even looking at how petrol is made, which btw also requires electricity.

          • Maëlys@slrpnk.net
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            1 year ago

            but heavier cars ruin the road structure. Highways need an alternative for bitumen, and overall electrify the production of road components, including steel and concrete.

            • 𝙲𝚑𝚊𝚒𝚛𝚖𝚊𝚗 𝙼𝚎𝚘𝚠@programming.dev
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              1 year ago

              Increased truck traffic does way more harm than electric cars do.

              • Sonori@beehaw.org
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                1 year ago

                Yep, road where goes with the square of vehicle weight. A singe semi truck is far more damaging than a hundred cars, and bikes don’t do damage period.

                As for EVs, while they are often heavier than ICE’s, it’s only by a few percent, and less impactful than the vehicle obesity epidemic we’ve seen here in the US in the last decade.

                • Maëlys@slrpnk.net
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                  1 year ago

                  goods should only be transported on rail, period. i agree about the rest.

                  • Sonori@beehaw.org
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                    1 year ago

                    It makes some sense to use electric or biofuel trucks to move goods for short distances as well as the distance between a facility and an distribution yard, but for long distance I fully agree that we called them multi modal containers for a reason. You can move a container from truck to electric train in seconds, and indeed we already do that for anything that has to travel by ship anyway.

                    Moving goods vast distances over land extremely cheaply and with zero carbon emissions is a problem that was solved long ago with overhead electrified rail, and it’s amazing to see the lengths we here in North America will go to avoid investing in it.

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