Sounds like Notch has played some Star Fleet Battles, where Cloaking does indeed take almost all your power. In fact the best thing about SFB was how power was

Sounds like Notch has played some Star Fleet Battles, where Cloaking does indeed take almost all your power. In fact the best thing about SFB was how power was a limited but very flexible resource -- should I go faster, overload weapons, reinforce shields, power special maneuvers, tractors, repairs, etc. I can see how you could build a great MMO around this.