substation

noun

1. A site where electricity supplied by long-distance (high-voltage) transmission lines is transformed or regulated for local (low-voltage) distribution.

   “The utility now wants the network to be undergrounded in the urban areas, which would mean substations with 33 kV distribution swtichgear.”

   “Meanwhile, an upgraded power supply at Sundon substation, between Leagrave and Harlington, will be commissioned concurrent with the overhead line connection and will be sufficient to power the initial electrified Corby services.”

   “The Project also includes construction of a new MVEC substation (the Laketown Substation). […] Great River Energy owns and operates more than 5,100 miles of transmission line (69-kV or higher) and owns more than 100 substations in Minnesota, North Dakota, South Dakota, and Wisconsin.”

2. A satellite police station serving one neighborhood or part of a larger jurisdiction.
3. A branch post office.
4. Any subordinate station.