The threshold changes with the season to reflect changing usage patterns – for example, there are fewer hours of daylight in the winter and some customers use electric heating.
In the winter period (November 1 – April 30), the tier threshold for residential customers is 1,000 kWh
In the summer period (May 1 – October 31), the tier threshold for residential customers is 600 kWh
The tier threshold for small business customers is 750 kWh all year round.