This is a controller for a domestic air conditioner that minimises the cost of electricity by using the buying discretion afforded by the thermal storage in the house.

An interval meter is used to gain exposure to the wholesale spot price of electricity, with the addition distribution and other fixed charges.

This approach could also be adapted to other domestic applications, such as charging electric cars.

While the project would be justified by the cost savings to the customer, the increased price elasticity of demand would also benefit the operation of the National Electricity Market.