Powered
Can be set to 'yes' or 'no' and determines whether or not this BuildingType requires power to function. Setting it to 'Yes' will cause all of it's active animations to freeze whenever it is underpowered by default. Setting ActiveAnimPowered=No in the art entry will negate the freezing effect for that animation. Underpowered buildings with Powered=Yes will also stop emitting light if it is a lightpost, and will also not fire it's weapons.
Bugs/Side-Effects/Unexpected Limitations
This tag breaks ProductionAnim logic such that, if the building has low power, the first frame of the production anim is played for the duration of the animation, then the animation disappears. The animation re-appears and goes through the remainder of it's frames as soon as the building regains power