transformer substation; electrical substation
A facility where voltage is transformed for power distribution. Common in technical and everyday contexts.
A new transformer substation was built in this area.
I live near a substation, so I sometimes hear a low humming sound.
Compound of 変 (hen, 'change') + 電 (den, 'electricity') + 所 (sho, 'place'). A straightforward technical term.