SWIS Observatory

Stress days make the transition legible.

The operating days where rooftop solar, minimum demand and the evening ramp expose what an isolated grid must still hold together.

Record: 90 operating days
Lens: Demand, solar and ramp
Source: AEMO WEM

Lowest operational demand

The registered-generation floor, before rooftop solar is added back.

0116 Aug 20261026 MW
029 Sept 20261036 MW
0312 Sept 20261090 MW
0410 Sept 20261105 MW
0530 Aug 20261151 MW

Highest rooftop PV share

Reading the record

A stress day is a system question, not a score.

A low registered-demand day can still carry high underlying demand once rooftop PV is restored. A steep ramp is not automatically a failure. The point is to see which resources stayed online and what operating capability the system was using.

Open daily record

Behind-the-meter solar as a share of the underlying-demand proxy at its daily peak.

019 Sept 202664.9 %
0210 Sept 202664.4 %
0312 Sept 202662.7 %
0430 Aug 202660.7 %
0516 Sept 202659.7 %

Steepest evening ramp

The rise from the daily operational-demand minimum to the evening operating peak.

0116 Sept 20261742 MW
029 Aug 20261697 MW
035 July 20261695 MW
0428 July 20261685 MW
051 Sept 20261677 MW