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Eclipse Now's avatar

"Copper is used in a range of low-carbon technologies: solar, wind, electricity grids, and vehicles. In most processes, it’s hard to substitute, although aluminium could be substituted in some grid applications." This is where I would LOVE some interviews with engineers etc. Sure aluminium only has 60% of the conductivity of copper. But the following aluminium How would we do it? This is the claim. Just use more! "This means you will need a 25% thicker wire for the same results. However, the aluminium in this equivalent wire will cost and weight about half as much as copper. That’s it. Aluminium in power lines? Of course! Also underground! And in transformers and coils, in motors? Yes!"

He claims over 90% of the roles of copper can be replaced with aluminium, including batteries, EV’s, electric motors, wind turbines, etc. Just use more. https://www.shapesbyhydro.com/en/material-properties/how-we-can-substitute-aluminium-for-copper-in-the-green-transition/

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Just Dean's avatar

At first, I was trying to understand why electric grid expansion would impact the need for copper since almost all overhead lines are aluminum with steel cores and most of what we need are high voltage overhead transmission lines.

This article from BNEF does a good job of describing the amount of overhead lines versus underground cable that we will need and the amount of copper vs aluminum required.

https://about.bnef.com/blog/a-power-grid-long-enough-to-reach-the-sun-is-key-to-the-climate-fight/

They estimate we will need 427 million metric tons of copper and 650 metric tons of aluminum for the global grid expansion by 2050.

Ideas that could help limit the amount of transmission lines required are storage and repurposing existing fossil fuel plants with advanced nuclear (SMRs) and natural gas with CCS.

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