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

Mr Tom Lockley: Pyrmont History Group, Powerhouse Museum Interest Group

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