It is the Northern Territory's only provider of electricity, water and sewerage services.Power and Water became the first government-owned corporation in the Northern Territory.There are three power networks, or electricity grids, in the NT, with each network the Australian Energy Regulator managing investment and efficiency, while PowerWater manages the day-to-day-operations.[3] PowerWater is also responsible for management of sewerage and the major water catchments in the region.For many years, Darwin's principal water supply came from Manton Dam.