[Ernest_at_the_Beach]

Currently, Spectrolab's terrestrial concentrator cells are generating power in a 33-kilowatt full-scale concentrator system in the Australian desert.

[AZLiberty]

Currently, Spectrolab's terrestrial concentrator cells are generating power in a 33-kilowatt full-scale concentrator system in the Australian desert.

"Standard test conditions" for solar energy are 1000 watts per square meter, so you'd need about 83 square meters to produce 33 KW at 40% efficiency, or a 9 m by 9 m array of mirrors and collectors, plus the control capability to keep it pointing at the sun. I'm guessing this would provide the air conditioning power for about 4 or 5 homes in the Australian (or Arizona desert), so Phoenix would need about a quarter million of these things to replace the power required for home air conditioning.

[calljack]

I worked for Spectrolab in the early 80's
This is very high.