Hydropower accounted for 58.6 percent, up from 45.9 percent last year, according to Business News Americas.
Wind and solar together accounted for 4.2 percent of total generation in the month.
Endesa led generators in terms of output, producing 1.63 TWh, according to data gathered by local bank Banco Bice. This figure was down 12.3 percent year-on-year, while Colbún increased generation 17.1 percent to 985 GWh.
Marginal costs on the SIC increased 7.8 percent to $76.80/MWh.
The metrics follow CDEC-SIC's release of a series of recommended works totaling around $189 million to improve and expand the grid's trunk line system.
The projects have a total estimated cost of around $189 million, and were recommended as part of CDEC-SIC's annual trunk line transmission study.