Wikia

A power core was an energy production facility that provided power for buildings and starships. Cities had numerous power cores built within their boundaries to provide energy to the various homes, facilities, and businesses established within. Colonies and encampments often had a more primitive form of power core, these being little more than an oversized energy cell. Rather than produce energy, it supplied power until it ran out. These smaller power cores were often used by survey teams, due to their much smaller impact on the environment. A damaged power core was used by the Trade Federation and the Wookiees' destruction of it was one of the catalysts of the Battle of Alaris Prime. In 28 ABY, Wedge Antilles ordered the shielding efficiency of the Mon Mothma to reduce at a set rate, tricking the Yuuzhan Vong into thinking its power core would explode.