The ANU SG4 (Solar Generator 4) dish is the world's largest paraboloidal dish solar concentrator, with 489 m2 of mirror aperture area. At the focal plane it produces an average concentration of 2,100 suns over a disk with diameter 530 mm, and a peak concentration of 14,000 suns. Construction of the SG4 dish was completed in June 2009, and it first generated steam on sun in July 2010. SG4 was developed and built by ANU in collaboration with Canberra-based company Wizard Power, with support from an AusIndustry Renewable Energy Development Initiative (REDI) grant.
This dish is a prototype of a design (the 'Generation II Big Dish') that is intended for use in large scale solar thermal power generation systems, where large arrays of dishes are joined to feed energy to a central power generation plant. SG4 is used to obtain experimental data supporting investigations into energy conversion processes, to seek design improvements and to support efforts to license and commercialize the technology. SG4 is currently operated with a monotube boiler receiver which produces superheated steam at up to 550°C at 5.0 MPa.