Energy Vault's 'fixes' to its first approach leads to CO2e/kWh worse than natural gas, and makes a mockery of its claims of low cost storage.
, an alternative technology which is also funded by the crowd around Bill Gates, you have to filter a Houston Astrodome’s worth of air to get a ton of CO2.
And now there is Energy Vault, making Gross’ contribution to climate solutions a trifecta of challenges. At their remarkable claims of 360 days working per year, one cycle per day, and 35-40 years of work, that would be 14,400 lifts. That brings the carbon debt delivered down to only 1.8 kg per kWh, which is to say about 80% worse than burning coal and about 170 times worse than wind energy.
Instead of cranes, they are using elevators, which is to say cranes inside the building, but protected from wind and rain. Assuming 20% of the carbon debt per block, because there’s only so much you can do to make something that behaves like reinforced concrete, and the same remarkable 40-year life time and equally remarkable 97% uptime, that gives a carbon debt per kWh of 317 grams CO2e, or 60% of natural gas.
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