This post presents the electricity data for South Australia (SA) for the days leading up to a localised blackout that occurred there in the early hours of 1st December 2016. The data suggests that there was an interruption to the supply of around 200 MW via the Heywood interconnector with Victoria, with no obvious cause within South Australia.
The following figure shows SA wind power for the 10 days leading up to December 1st, separated into 3 groups, corresponding to the 3 clusters of wind farms in the state:
Wind power was very low at the time of the blackout (just to the right of the 31-line in the figure above, which represents 10 minutes past midnight AEDT, 1st December), but such wind power lulls are very common in SA, as the figure above suggests. See the previous post for more wind power history, showing that daily wind power lulls are the rule rather than the exception.
The following two figures show the various contributions to electricity supply for the 29th and 30th November, extending 1.5 hours into the following day:
There is no obvious cause within SA of the loss of supply from the Heywood interconnector shown on the second figure. Note that the sudden rise in consumption (the black curve) shortly before midnight is a regular event caused by domestic water heating.