substation

From sub- + station.

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substation (plural substations)

1. A site where electricity supplied by long-distance (high-voltage) transmission lines is transformed or regulated for local (low-voltage) distribution.
   • 2006, Janes Northcote-Green, Robert Wilson, “Design, Construction and Operation of Distribution Systems, MV Networks”, in Control and Automation of Electrical Power Distribution Systems‎^[1], CRC Press, →ISBN, page 110:

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

   • 2019 October, Philip Sherratt, “Midland Main Line upgrade presses on”, in Modern Railways, page 62:

     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.

   • 2024 August 19, “LAKETOWN 115-kV TRANSMISSION LINE PROJECT IN CARVER COUNTY, MN”, in Great River Energy‎^[2], page 15:

     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.

• sub-station

• “substation”, in Lexico, Dictionary.com; Oxford University Press, 2019–2022.

• bus station