ATU's (aerated treatment units) are configured differently across the range of manufacturers.
For a household of six (6) people assuming a throughput of 900L/d (150L/person/day) and the blower operating full time the total energy consumed per year 853 kWhr.
With a calculation 26.47c per kWhr the maximum cost of running your ATU is $225 per year.
Synergy apply tariffs to your bill subject to your provider and conditions that vary depending on region.
ATU systems comprise three electrical components:
Nitto 80L/min blower 86 watts
Davey D42 irrigation pump 350 watts
Control /panel 1 watt
While the irrigation pump is the highest power consumer its operation is on average 30 minutes per day, allowing 3 discharges per day. Limiting power consumption is via blower management.