Annual Report 2014/2015 Utilities Commission
Tabled paper 1571
Tabled Papers for 12th Assembly 2012 - 2016; Tabled Papers; ParliamentNT
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24 The Commissions overall objective for the annual PSR is to provide the following key information: data to support the identification by market participants of the most economic future options for augmentation and expansion of infrastructure to maintain security and reliability standards; credible and dependable medium and long-term forecasts of future supply and demand conditions under various scenarios; possible future generation, transmission and distribution capacity constraints (projected system adequacy for medium and long term), taking into account maintenance and outage plans; integration with the planning and maintenance management of infrastructure assets; analysis of generation, transmission and distribution performance data; adequacy of sources of fuel for electricity generation for the medium and long term; analysis of generation and networks reliability performance, and customer service performance information; and analysis of power system incidents and identification of underlying systemic issues. Key Findings of the 2013-14 Power System Review The 2013-14 PSR found that the reliability of the Darwin-Katherine power system declined during 2013-14. On 12 March 2014, a System Black incident occurred, following action taken by Power and Water in response to a malfunctioning circuit breaker. The various responses to the System Black incident, including failures of black start generators, either exacerbated or extended the incident. The 2013-14 PSR also noted a significant number of generation-related load shedding incidents that were not due to insufficient generation capacity, but rather the response of some generator units (at times not being able to respond appropriately following an outage of a single generator unit). The Commission recommended that the value to customers of improved power system performance should be given increased focus and used as a planning tool. The review also found that there are critical aspects of the power system supply chain that have limited redundancy, and there are multiple examples of underperforming equipment. The 12 March 2014 System Black incident and 11 September 2014 gas supply failure incident demonstrated a lack of system robustness in the Darwin-Katherine power system. In the 2012-13 Review, the Commission observed that many of the incidents in the power system were multiple contingency events. This was less of an issue in 2013-14 but there were nevertheless several significant incidents. Responses to major incidents appeared to be mixed and the Commission was concerned that the level and effectiveness of contingency planning is lacking.