The PSPS events were PG&E induced events because they were scared that the lacked of maintenance on the lines over years and high winds would create new wildfires so they turned off large sections of the grid. They also used the grid being down to do other checks while the power was off. I think I lost power (pre-solar+ESS installation) for about 10 hours on one day.
I hate articles like the one that you linked to as there isn't enough information in there to form a real opinion. CEC, CPUC and CAISO thinks that there will be a short fall of 1700 MW over the year. What does that mean? Should I be afraid? I don't know as there is no context or any information like they expect that there will be 4, 5, 10, 30 days were demand will exceed supply for 1, 2, 3, 8 hours. Looking at CAISO for today the demand is expected to peak at 27.7 MW and the capacity is 42.3MW. The worst case demand was 50.3 MW on 7/26/2006, so does that mean we are looking at a 8000 MW shortfall? Mostly fear mongering to explain why costs are going to go up 4-9% a year from now on.