I disagree. Regigigas' POWER sacrifices a Pokémon as part of the POWER's effect, which would be blocked by Power Spray. The text for Electrode's POWER as it's been posted above mirrors the text of Electivire FB LV. X's POWER, such as if you declare you're using the POWER, your turn ends (in Electrode's case, he gets knocked out). As has been ruled with E-Vire's POWER, the turn still ends even if it gets sprayed. Given the similarity in POWER text, I'd wager the same would apply for Electrode's POWER, even if it gets sprayed.
In any case, as you stated, an official ruling will eventually resolve this.