Up to 400 public housing units in Adelaide will be fitted with rooftop solar after SA government called for tenders for the project.
“This project will provide savings on residents’ annual energy bills of at least $150 each year.” That doesn’t sound like a lot compared to how much a typical electricity consumer might pay each year. My guess is that each resident only has a small number of panels.
Assume an export factor of 30%, an average electricity price of 26 c/kWh, and an electricity buyback rate of 8 c/kWh.
150*(0.3/.08+0.7/0.26)= 966 kWh saved per year.
Assume an average Adelaide resident uses 20 kWh per day, or 7300 kWh per year. The percentage saved on electricity is 13.2%.