Reports / Papers

Reports

Title	Date	Description
Whirinaki Dispatch [173kB]	Jul 2010	Query on why Whirinaki (WHI) station was dispatched on 15 June 2010.(additional report)
Whirinaki Dispatch [116kB]	Jul 2010	Query on why Whirinaki (WHI) station was dispatched on 9 June 2010.
Whirinaki Dispatch [206kB]	Jun 2010	Query on why Whirinaki (WHI) station was dispatched on 15 June 2010.
Multiple Frequency Keepers Project Report [353kB]	Apr 2010	Details a strawman approach for implementing AGC with details of the proposed interface to generators and the HVDC.
Whirinaki Dispatch [180kB]	Mar 2010	Query on why Whirinaki (WHI) station was dispatched on 18 February 2010.
Real Time Pricing Issues [68kB]	Nov 2009	On 12 November 2009, Real-Time Prices (5 minutes prices) were incorrectly published to the market. This report explains how this occurred, the steps taken to resolve the issue and the action undertaken to minimise the likelihood of recurrence.
Whirinaki Dispatch [50kB]	Oct 2009	Query on why Whirinaki (WHI) station was dispatched on 10 September 2009.
South Island Frequency Event [278kB]	Sep 2009	A summary report on the South Island frequency event that occured on 1 August 09.
Huntly Unit 5 Commissioning [122kB]	Nov 2007	Learnings from the Huntly Unit 5 commissioning (2007).
North Island Frequency Excursion [45kB]	May 2007	A summary report on the North Island frequency excursion that occurred on 29 April 07.
Benmore Tripping Event 30 Mar 07 [86kB]	Apr 2007	Initial investigation report for the 30 March 2007 tripping at Benmore Power Station and the HVDC Pole 1 that resulted in the loss of 326 MW from the South Island power system.
Otahuhu and Huntly Tripping Event [214kB]	Dec 2006	Summary of events on 1st December 2006 when restoring the power system after the tripping of the Otahuhu CCGT coincided with a further loss of generation at Huntly, resulting in a Grid Emergency
Huntly Unit 5 Commissioning Information Overview Document [103kB]	Nov 2006	This paper provides an overview of the changes required to the System Operator’s scheduling and dispatch process to enable the commissioning of the new unit 5 generating unit at Huntly
Wellington Voltage Stability Study During HVDC South Transfer [226kB]	Sep 2006	Report to determine the system limits for power flow from Bunnythorpe to Haywards while HVDC is in south transfer for the Wellington
Summary of South Transfer Limits post May 2006 [186kB]	Sep 2006	This presentation is to explain the transmission limits for future dry year events and comment on SI reserves interaction with HVDC dispatch
Review of 19th June Generation Shortfall [92kB]	July 2006	Report to determine what factors contributed to the shortfall and the changes in availability of generation on the 19th June and the previous day
Initial Report on 19th June Generation Shortfall [902kB]	June 2006	Report for the Minister of Energy into the Operation of the New Zealand Electricity Power System on Monday 19th June 2006
System Operator Constraint Audit [191kB]	April 2006	Review of the Process for Design, Development, Testing, Application, Real-Time Use, and Removal of Security Constraints
System Operator Constraint Audit Recommendations & Actions [66kB]	April 2006	Recommendations and Actions from the Review of the Process for Design, Development, Testing, Application, Real-Time Use, and Removal of Security Constraints
Otahuhu 220 kV Fault [41kB]	Feb 2006	Report of system event at Otahuhu Substation on 15th February 2006 at 09:34 hrs
NI Frequency Excursion Report [39kB]	Jan 2006	Report on frequency excursion on 11 Dec 2005
SI Frequency Excursion Report [24kB]	Dec 2005	Report on frequency excursion on 04 Dec 2005
HVDC Pole 1 Unplanned Outage [36kB]	Mar 2004

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Papers

Title	Date	Description
Rule Change Proposal: Disconnected nodes [273kB]	Aug 2008	This paper proposes various rule changes relating to disconnected nodes to ensure the System Operator’s new market systems are strictly compliant with the rules and to improve rule clarity and correctness.
Dispatch of Instantaneous Reserve [70kB]	May 2008	This paper proposes a rule change to enable the partial dispatch of reserves when there is a shortage of energy and reserve offers.
System Operator Commentary on “Reasonable Estimate”\| [119kB]	Feb 2007	The Electricity Commission has sought the System Operator’s advice on how the term “reasonable estimate” should be interpreted and applied in Rule 6.3.3 of Section II of Part G. This paper also provides comments on the issue of ensuring that sufficient quantity and appropriate quality of reserves are available to the System Operator and the continued downward pressure is applied to the cost of reserves.
Proposal for Changes to the EGR Compliance Regime [236kB]	Jan 2007	What the objectives of an appropriate industry compliance regime should be, implementation issues with the existing compliance regime and achievement of industry objectives, suggested changes to both processes and regulations and rules that could better achieve industry compliance objectives
Instantaneous Reserve Monitoring Survey Results [146kB]	Oct 2004	This paper summarises the Instantaneous Reserve (IR) monitoring technology and cost survey undertaken by the System Operator on behalf of the Common Quality Advisory Group (CQAG), and discusses the future monitoring options available.