This sign, nothing to do with Robert Palmer, is inside the Balmain Power Station pump house building. The power station operated from around 1909 until it was decommissioned in 1976. In its day it supplied electricity to Balmain, Leichhardt, Ashfield, Newtown and Petersham, which is pretty amazing when all we can see today is an old brick shell with a bit of scaffolding to hold it up and a great old sign. The letters are copper and were salvaged when the power station itself was demolished.
Alphabet City Press 