If I install an embedded generation (e.g. PV) system to a connection point with a revenue and sub-meter arrangement, what needs to happen to the metering?

The revenue meter is required to be changed or reconfigured to measure bi-directional energy flows (import – export meter registers) before the connection of the embedded generation system. Please contact your electricity retailer before applying to Western Power for technical approval of your proposed system.

If a sub-meter is associated with the connection point at which bi-directional flows will occur, you may wish to engage a licensed electrical contractor to change the sub-meter and make the necessary arrangements with you at the revenue meter.

If bi-directional flows will occur at a sub-meter the measurement of energy flows is at the discretion of the customer. You may wish to engage an electrical consultant or contractor for energy management options.

Common sub-metering arrangement

The diagrams below illustrate typical revenue meter and

sub-meter configurations.

Residential property with granny flat

Apartment buildings and shopping centres

Power station

Note: SPD means Service Protection Device.