Good catch, the links in my previous post are not accurate. The correct links for [2][3][4] are:

[2] http://www.cammesa.com/uflujpot.nsf/FlujoW?OpenAgent&Flujo%2... [3] http://www.cammesa.com/uflujpot.nsf/FlujoW?OpenAgent&Flujo%2... [4] http://www.cammesa.com/uflujpot.nsf/FlujoW?OpenAgent&Flujo%2...

The 500 kV lines form the backbone of Argentina's power grid. The drastic fall in power flows shows the massive shedding of load and generating capacity, as presumably plants disconnected from the grid for safety. One can step through the next few hours to see how generation was restarted.