I've skimmed every card and haven't seen an explanation, so I figured I'd ask another question.
Opp ships and SF Ship Panels can obviously have a [W] or [D] value go down to zero. To me, it's more obvious that that particular energy type is at zero if there are no chits on it at all - if I see a chit on it from across the table, I'm likely to assume that there's at least 1 energy there. I have found no techs with energy values of zero, and no boosts or missions or effects that reduce the energy of a tech to zero without scrapping/recycling it.
So...are the chits with 0 on them supposed to represent 10 energy? Or are they there to truly mean 0 for people who like having a chit in place with no value?