Last weekend, two of the major coal-fired power plants in Victoria, Australia shut down in the middle of the day, when demand is high because of the many commercial uses, and since it’s summer, because of air conditioning.
Demand for electricity may have been high, but demand from the grid was so low that one of the big companies even shut down a third plant for maintenance.
The reason? More than 510,000 homes in the state have rooftop solar that feeds into the grid.
The report by PV Magazine has a (copyrighted) graph comparing grid demand on this occasion to what it was in 2017, only 4 years ago. Do have a look.