There are a number of other organisations and individuals working on this issue,  including:

Save the Powerhouse an Ultimo-based state-wide  community campaign

North Parramatta Residents Action Group, advocating for the conservation of the Fleet Street heritage precinct and opportunities for cultural uses

MP Alex Greenwich

MP Jamie Parker    –  and sign his petition

Links to more information:

Powerhouse Museum / Museum of Applied Arts and Sciences 

National Trust of Australia (NSW), supporting retention of the Powerhouse Museum in Ultimo and development of a satellite museum in Parramatta     

Council of Australasian Museum directors has a useful summary of museum news 

Sydney Business Chamber advocating for Western Sydney economic and cultural development