Planets and asteroid in the old power system used to have enough power capacity so that a player could drop down a factory and build power blocks. even when they had no means to generate power. Without this ability, it was possible to get truly stuck in the game.
To restore this feature in the new power system, plaents/asteroids should generate some small amount of power (maybe 1 unit), so there is the possibility of a lone factory to produce a reactor module and allow a stranded player to construct a ship when they have no other gear.
Planets and asteroids had some power capacity in the past, they never generated that 1e/s, only shipcores did that.
However, the power supply beam as handheld does not work anymore to power a factory, as there is nothing like capacity in power 2.0 that could be externally filled by such a handheld beam. It could possibly help to allow it charge a single machine, not the whole structure, as a possible "top-off" charge could easily consume all the supplied energy by the beam.