Losing the three power generators seriously affected the energy budget of the Vandals over time. The projections became so bad that the Swordmaidens temporarily lent one of theirs to them until the fleet shipped over a spare power generator they cobbled up out of spare parts and materials.
All of the power released in the form of heat, pressure, electromagnetic radiation and etcetera could have been employed to feed their mechs and transports of their voracious hunger for juice.
Still, it was for a good cause. If the Flagrant Swordmaidens sent their melee mechs against Pairixan, then the result would have been no different than throwing an egg against a rock.