Well, "planet - shield generation" should be shields for the planet its attached to! It really is too bad that the .EXE dosen't check for abilities in all these places.
Shield regen on sats, planetary phased shields, inherent planet shields. These are things I would really like to work.
That ability is attached to the Massive Planetary Shield Facility.
To bad you can't start planets with facilities and cargo on them,sort of like useable Ruins.