Some customers may notice that their solar photovoltaic (PV) system stops generating or exporting energy for a short time - usually an hour or less.

SA Power Networks is conducting its annual test of our ability to temporarily curtail rooftop solar generation. This is a capability we may be directed to use by the Australian Energy Market Operator (AEMO) to help keep the electricity system stable during a system security emergency.

What is happening

100,000 customers will each have their solar PV systems curtailed for no more than 1 hour each. Not all systems will be curtailed at once, with the test starting from 8 am and going until sunset.

• Number of customers involved: Around 100,000. 
• Timing: Less than one hour of curtailment, chosen for a day with moderate solar output to minimise impact. 
• Impact: Systems will ramp down to 0 kW, then ramp back up. On average, customers will miss about 1.5 kWh of generation. 
• After the test: For any systems that curtailed or reconnected too slowly (or not at all), we’ll work with agents and manufacturers to improve performance. 

Why an annual curtailment test?

If AEMO directs SA Power Networks to act, it may have to happen at a moment’s notice. This once-a-year exercise is like a fire drill for the grid. It simulates a rare but urgent situation so we can confirm that all systems and people are ready to respond if an actual emergency occurs. 

We need to be sure that:

• Solar systems installed after September 2020 are compliant. 
• Third parties known as Relevant Agents, who are responsible for disconnecting and reconnecting systems, can respond quickly. 
• All systems reconnect smoothly once the emergency is over. 
• If compliance or responsiveness is lacking, more severe measures may be needed in a real emergency. This test helps confirm we can rely on the Smarter Homes capability.

What do you need to do?

The test will be complete by sunset today (19 August). Most customers will not notice that the test is being conducted. If you want to confirm that your system has returned to normal, check your inverter screen or your mobile app the day after the test (20 August). 

If you’re concerned that your system has not come back on, or if you are unsure, contact your solar installer or inverter manufacturer. We’ve already informed installers and manufacturers about this test. 

More information

Read more about the Annual Smarter Homes Solar Curtailment Test