The National Electricity Rules (NER) required the AER develop and publish certain guidelines, models and schemes that will be applied to distribution network service providers. On 26 June 2008, in accordance with clause 6.6.2 of the NER, the AER published a service target performance incentive scheme (STPIS) and final decision document.
On 15 May 2009, the AER published an amended STPIS. The amendments are designed to address certain issues in version 1.0 of the scheme that the AER has become aware of since its release in June 2008.