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How does this compare to, for example, https://www.promes.cnrs.fr/index.php?page=concentrateurs-sol... (3000°C)? I personally visited one such site in Southern France more than 30 years ago.

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That's a research/materials testing facility. Heliogen is aiming for industrial applications which means it has to scale more cheaply than a bespoke installation.

So the breakthrough is really in production methods of the facilities?

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