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janalsncm06/16/20253 repliesview on HN

Could this also be a viable alternative to HVDC lines for civilian applications?


Replies

theamk06/16/2025

No. 800 watts (vs megawatts for HVDC). 5 miles vs thousands of miles. 20% efficiency optical to electrical - so electrical vs electrical is much worse - vs 90%+.

This is so much worse in every aspect it's not really compareable.

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other_herbert06/16/2025

The key thing they aren't saying is how much power it took to "send" 800 watts 5.3 miles...

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_fizz_buzz_06/16/2025

This can only be used where efficiency doesn't matter, like military applications for powering a drone. The overall efficiency i.e. grid -> laser -> pv -> grid would be atrocious.