Changes to the deeming period from 1 January 2023
Source: The Clean Energy Regulator
The deeming period for solar PV systems decreases by one year for all systems installed after 1 January 2023 as outlined on the deeming period decline page on our website. For systems installed in 2023 the deeming period is a maximum of 8 years, one year less than the 9 years for systems installed in 2022. This change will reduce the number of small-scale technology certificates (STCs) that solar PV systems may be eligible for.
We have updated the Small generation unit STC calculator to reflect the upcoming deeming period decrease and help you calculate the number of STCs, that a system may be eligible for, from 2020 to 2030.
We closely monitor all installation dates for claimed STCs to ensure the correct deeming period is applied. It is important to remember that the provision of false and/or misleading information is an offence under the Renewable Energy (Electricity) Act 2000 . STCs which have been improperly created will be failed and subject to enforcement and/or administrative action.
Deeming period change also applying to Solar Water Heaters
The deeming period for Solar Water Heaters and Air Source Heat Pumps will also be changing. As with solar PV systems, for Solar Water Heater systems installed in 2023 the deeming period is a maximum of 8-year, one year less than the 9 years for systems installed in 2022.
|Year solar (PV & SHW) system installed||Deeming Period in years|