Could this also be a viable alternative to HVDC lines for civilian applications?
The key thing they aren't saying is how much power it took to "send" 800 watts 5.3 miles...
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.
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.