That compares to about 6MW of installed capacity at the beginning of the year.
Megawatt Solar is a 930kW solar array built by the federal power company Eletrosul at its headquarters in the southern state of Santa Catarina.
The panels are installed on the roofs of the company's car park and the main building.
Total investment in the project was R$12m ($5.4m) according to power regulator Aneel.
