Mui Wo Waste Incinerator (2nd generation) [1987-????]
This is the larger incinerator that replaced the first generation incinerator that was further inland. Henri McKerr-Kastan helped locate that one, so I asked if he knew where this one was.
I think it was along Mui Wo Ferry Pier Road near the sewage works. There was also a slaughterhouse there.
Then promptly sent a map with the exact location:
Many thanks to Henri for his help, and for Annemarie Evans for putting us in touch via her Hong Kong Heritage radio show.