On 6 May 2010, the AER made its final determinations on the regulatory proposals submitted by Energex and Ergon Energy, the Queensland electricity distributors. The determinations cover the regulatory control period 1 July 2010 to 30 June 2015 and set the revenue that each of the Queensland distributors are able to recover for the provision of electricity distribution services.
On 19 May 2011, the Australian Competition Tribunal (the Tribunal) varied the AER's determination. The Tribunal made its orders after a review of the value of imputation credits (gamma), alternative control services (quoted services) and labour cost escalators.