The Tasmanian Energy Security Taskforce's (the Taskforce) Final Report
, released in June 2017, recommended the development of a clearly defined framework for assessing and managing Tasmania's energy security. A key element of the Taskforce's framework is the monthly public reporting of energy in storage levels in Tasmania against Prudent Storage Level (PSL) and High Reliability Level (HRL) profiles.
The HRL was originally set such that energy in storage above this level was sufficient to meet demand over a six month period without Basslink support. The PSL profile provided extra capacity, in the event of historically low, three-month inflows, to maintain storages at or above the HRL. The Report specifies that one of the conditions necessary for a review of the profiles is a material change to either supply or demand equivalent to two per cent (around 300 GWh) of total energy in storage in the Tasmanian region of the National Electricity Market.
The commencement of generation by the Cattle Hill and Granville Harbour windfarms during 2019-20, which can produce a combined 863 GWh annually, prompted the Regulator in its capacity as Monitor and Assessor to review the profiles as set out in the Final Report.
On 20 May 2021, the Regulator provided the outcomes of its review and its advice to the Minister for Energy and Emissions Reduction, the Hon Guy Barnett MP (the Minister). The advice provided can be found here.
The Minister accepted the Regulator's advice and instructed the Department of State Growth to prepare an Order setting out the revised profiles.
The revised PSL and HRL profiles are shown below: