Controlled Load Calculator
Estimate the cost of a controlled load circuit, such as off-peak hot water or pool pumps, billed at a separate lower tariff.
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Calculation breakdown
- Cost
- Cost = controlled load kWh × controlled load tariff rate
Worked example
300 kWh of quarterly controlled load usage at 22c/kWh costs about $66 a quarter, roughly $264 a year.
Assumptions
- Controlled load rates and eligibility vary by network and retailer.
- Excludes any separate supply charge for the controlled load circuit.
- Assumes usage is billed entirely at the controlled load rate.
How this calculator works
Enter your controlled load usage in kWh and its specific tariff rate, separate from your general usage rate, to estimate the cost of appliances like electric hot water systems or pool pumps on a dedicated circuit. Controlled load rates are usually cheaper because supply is restricted to off-peak hours.
Frequently asked questions
What appliances typically use controlled load?
Electric storage hot water systems, pool pumps and underfloor heating are commonly connected to a controlled load circuit.
Why is the controlled load rate lower?
Retailers offer a discount because supply on this circuit is limited to set off-peak hours, easing demand on the grid at peak times.
Is controlled load the same as off-peak?
They are related but distinct; controlled load is a dedicated circuit while off-peak usually applies to all usage during set hours on a time-of-use tariff.
Actual prices, usage, efficiency and savings vary by provider, equipment, location and behaviour.