More than 400 panels have been installed in a huge, new solar system at Club Central Menai.
About 170kW of solar power are produced by the 432 panels, which have been fitted to every possible space on the roof.
Club Central chief executive Paul Richardson said the system was already delivering big benefits.
Mr Richardson said, during April - the first full month of operation - electricity consumption from Ausgrid dropped 30,449 kWh, compared with the same period last year.
Mr Richardson said these savings were on top of what was already being delivered by as 100kW solar panel system installed in 2009.
"As a community club we have made a conscious decision to operate in a sustainable way and reduce our impact on the environment," he said.
"Within the first three months, our investment in additional solar panels has delivered a 16 per cent decrease in our CO2 emissions compared with 2018.
"That's a significant reduction of our environmental impact.
"The system will also deliver ongoing savings on electricity costs into the future."
Mr Richardson said Club Central's operations at Hurstville and Menai had been awarded bronze partner status in the NSW Office of Environment and Heritage's Sustainability Advantage program
"The extension of our solar capacity at Menai is part of our efforts to obtain Silver Partner status," he said.
The Office of Environment and Heritage says the program "assists organisations to achieve increased competitiveness and improved bottom lines through better environmental practices".
Mr Richardson said Club Central's other sustainability initiatives included forming a Green Team made up of staff and management, installing LED smart lights across both venues and implementing a comprehensive recycling program for paper, cardboard, glass, cooking oil, plastic bottles and metal.
Mr Richardson said a waste processor was used to divert more than 200kg of food waste from landfill every day
The club recycled 50 per cent of total waste, he said.
