This is a cover of the Electric and Lighting Company from the 1920s.
This cover "won" a sign from the city council commemorating it and it says:
CITY ELECTRIC AND LIGHT COMPANY MANHOLE COVER
This refurbished artefact is a rare surviving example of a City Electric and Light Company manhole cover from the early twentieth century.
It was once part of a series of manhole covers and cast iron junction boxes that were placed along
In the next picture from where the lid picture was taken, you can see the lid and the sign in front of it Click for a larger image
Photographer’s note: Historic (non functional) manhole cover from City Electric Light in Brisbane.
More details can be found here Click for the item in The ultimate street signs site