The episode with the replicators trying to ion beam atlantis, was very similar to taking energy out of a plasma beam, so that reminded me of some kind of advanced MHD generator, which took a portion of the energy from the ion beam being shot through the stargate the power the shields of the weapons satellite.
Out of all the types of generators that you could put in a TV show, I think a super sonic plasma exploder is #2 behind the EFCG. Maybe #3 if you consider back to the future, because lightning is also pretty awesome.
SG1 had its stargate powered by event horizons, lightning. Atlantis had been powered by solar panels by the dying star in that one episode (pretty cool), metrological life forms too. Could have been a MHD type effect from the polar vortrex formed near the event horizon of a black hole that was powering the gate, with the time dilatation episode. The whole 'parasitic effect = 10 yottawatt generator' thing was cool.