The winning design for Parramatta's new Powerhouse Museum is expected to be announced as early as this week as the Berejiklian government seeks to draw a line under bitter protests that have marked its decision to relocate the venerable institution from its home in inner-city Sydney.

The move comes as Create NSW confirmed almost $20 million has been spent planning to relocate the Powerhouse Museum from its home in inner-Sydney Ultimo to Parramatta to date.

First conceptual drawing of the new Powerhouse Museum at Parramatta.

The international jury met one week ago to select the winning architects from a shortlist of six, comprising local and international firms.

The final decision has been kept under wraps with the government yet to deny claims that the museum's new riverside home will come at the expense of the state heritage-listed 1870s-built Italianate villa and former maternity hospital, Willow Grove.