Would more energy be available for capture from Jupiter's reflectance or direct from the sun? My heart wants to say yes but my head thinks even as a point source, direct solar energy is higher.

If it was other RF or heat, maybe not. I wonder if a Stirling engine could work alternating shade and Jupiter's direct radiation?

I also wondered if lowering a long tail could acquire electrostatic energy greater than its coefficient of drag. As above, cute but .. no.

The proof by example answer is "if it had been viable they'd have done it"