Sydney's Flemington markets has turned on Australia’s largest private rooftop solar installation, which it claims will shave millions of dollars off its power bills.

Sydney Markets has the largest single rooftop solar panel installation for a private company in the Southern Hemisphere.

Sydney Markets’ chief executive Brad Latham said the $8.9 million installation is a combination of the group’s sustainability plans and the growing financial viability of solar energy.

"We’ve been examining solar panels for around five years, the financial models really stack up now," Mr Latham told Fairfax Media.

"And with current electricity prices and the efficiency of solar panels it makes sense."