15 is a heritage-listed electrical substation at 182 Johnston Street, Annandale, Inner West Council, Sydney, New South Wales, Australia.

15 is an impressively detailed face brick and sandstone double height building designed in the Federation Freestyle.

[1] The words "Sydney ELECTRIC LIGHTING" and "SMC 1910" appear on the facade mounted as single letters.

The building is located within the Annandale Urban conservation area as listed by the National Trust.

[1] This Wikipedia article was originally based on Substation, entry number 00941 in the New South Wales State Heritage Register published by the State of New South Wales (Department of Planning and Environment) 2018 under CC-BY 4.0 licence, accessed on 2 June 2018.