Your Power Grid is reduced when Grid Structures are damaged.
The Civilian Building is one of the Tiles in Into The Breach.
Blocks movement and projectiles. Your Power Grid is reduced when Civilian Buildings are damaged. Buildings have a chance to resist damage based on your Grid Defense.
Some buildings have 1 Grid Power, some have 2 Grid Power. Once all power is destroyed, the building will turn into Building Rubble (effectively, a Ground Tile).
Buildings can be set on fire without damage.