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Retail

This folder provides access to datasets that relate to the operation of the retail electricity market.

Wholesale

The wholesale folder provides access to a wide range of data relating to the operation of the wholesale electricity market. For example, final pricing raw case files, vSPD input GDX files, and CSV files containing final prices, half hourly metered data, bids and offers, and much more.

Ancillary services

This folder provides access to datasets that relate to the operation of markets for ancillary services. Electricity markets require ancillary services to ensure the quality and reliability of the electricity supply is maintained at acceptable levels. Offers to supply frequency keeping services are an example of the data available to be downloaded.

Forward markets

This folder provides access to information and datasets relating to forward markets. For example, the weekly report summarising activity on the ASX New Zealand electricity futures and options exchange and the New Zealand electricity hedge disclosure system. Forward markets can take many forms, and enable parties to manage price or location risks by trading contracts derived from the spot market for electricity.

Environment

Environmental factors such as weather can significantly influence outcomes in the electricity market. This folder provides access to environmental datasets. For example, lake levels and inflows into hydro storage reservoirs.

Supplementary information

This folder provides access to supplementary information that supports reports published elsewhere by the Electricity Authority. For example, the analysis undertaken to support a consultation project or an industry study.

vSPD

vSPD is an independently audited, mathematical replica of the Scheduling, Pricing and Dispatch (SPD) market clearing engine used in the administration and operation of the New Zealand electricity market.

GEM

GEM, which stands for Generation Expansion Model, is a GAMS-based, long-term capacity expansion model of the New Zealand electricity sector.

Doasa

Doasa is a version of the stochastic dual dynamic programming technique applied to the solution of hydro-thermal scheduling problems.

HSS

The Hydro Supply Security (HSS) test applies a deterministic methodology to calculate the risk of a storable hydro supply shortage by assuming that storable hydro is treated as the last resort supply of energy. The HSS test is encapsulated in a simplified version of the vSPD model.

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Historical hydro risk curves

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Notes:

  1. The system operator is responsible for publishing the hydro risk curves (HRCs) as part of its security of supply function. HRCs are produced for New Zealand and the South Island. Please see http://www.systemoperator.co.nz/security-supply/sos-weekly-reporting/hydro-risk-curves for current HRCs and further information.
  2. The Authority undertakes industry and market monitoring, and shortage of hydro supply can impact things such as forward price expectations and market behaviours. This report tracks the history of the risk of shortage in the New Zealand electricity system, as reported by the system operator.
  3. Hydro data (storage and/or inflows) is sourced from NZX hydro (data provided by NIWA) and is not available for download. Please see https://energy.nzx.com for more information.
  4. In November 2010 responsibility for security of supply passed from the Electricity Commission to the system operator. The hydro risk curves are updated periodically including when there is a material change to the inputs. These updates are marked with a black triangle in the figure and have occurred for the following reasons:
    • 01 Feb 2010: Revised by the Electricity Commission.
    • 01 Jan 2011: The system operator revised assumptions. This was their first update after receiving responsibility for security of supply following the implementation of Electricity Industry Act 2010.
    • 01 Sep 2011: Updated.
    • 01 Jan 2013: Updated following assumptions that were consulted on in July 2012.
    • 18 Jan 2013: Changes in HVDC Pole 3 timing.
    • 17 Jun 2013: Demand update - confirmed outages update - adjustment to commissioning dates - alignment of supply and demand modelling.
    • 05 Jul 2013: Huntly unit 6 unplanned outage.
    • 15 Jul 2013: Modelling updated to fix an error - included Huntly unit 6 outage information.
    • 01 Aug 2013: Confirmed outages update - Tekapo canal outage update - modelling error fix.
    • 09 Sep 2013: Update HVDC outage - changed Ngatamariki modelled output.
    • 09 Oct 2013: Updated Huntly long term storage information - confirmed outages update.
    • 02 Dec 2013: Confirmed outages update.
    • 30 Jan 2014: Updated version of Emarket - change to start date of Mill Creek - change to TCC operation - confirmed outages update.
    • 28 Mar 2014: Updated demand forecast - updated Emarket transmission grid model.
    • 21 May 2014: Updated Kawerau generation - confirmed outages update - first official publication of 2015 HRCs.
    • 30 Jun 2014: Manapouri transformer outage - HVDC outage - updated Emarket model.
    • 29 Aug 2014: Inclusion of Southdown outage - temporary de-rating of Nga Awa Parua and Ngatamariki and adjustments to HVDC outages.
    • 30 Oct 2014: Major rework of demand and supply (embedded generation - demand update - demand fixes) - adopted COMIT hydro conversion factors - confirmed outages update.
    • 19 Nov 2014: Southdown capacity reduction - confirmed outages update.
    • 30 Jan 2015: Confirmed outages update - improved modelling of Waikaremoana - Tekapo conversion factor fix.
    • 27 Feb 2015: Confirmed outages update - new demand forecast - changes to TCC operation (reduction in capacity factor).
    • 31 Mar 2015: Confirmed outages update - revised water values - removed Southdown generator from 1/1/2016 - new version of Emarket.
    • 29 Apr 2015: Confirmed outages update - first version of 2016 HRC data.
    • 26 May 2015: Confirmed outages update.
    • 26 Jun 2015: Implemented minimum flow constraint out of Lake Tekapo - adjusted some generation maximum capacity to align model with assumptions - corrected Kaimai generation profile - removed Teviot generator from model - updated generation and transmission outages.
    • 29 Jul 2015: Minor adjustments made to the demand forecast - removal of a Manapouri generation/storage function - updated the maximum storage level of Manapouri + Te Anau - adjusted the merit order of generation - updated generation and transmission outages.
    • 18 Aug 2015: Removal of Otahuhu Combined Cycle from Oct 2015 - removal of capacity factor limitations on the Taranaki Combined Cycle generator from Oct 2015 - updated generation and transmission outages.
    • 23 Sep 2015: Addition of security constraints - change to the grid configuration in the LSI in 2016 - updated generation and transmission outages.
    • 29 Oct 2015: Updated generation and transmission outages.
    • 27 Nov 2015: Updated generation and transmission outages (including a restriction on the HVDC caused by BPE_PRM_HAY_2 outage).
    • 17 Dec 2015: Updated generation and transmission outages (including a restriction on the HVDC caused by BPE_PRM_HAY outages).
    • 28 Jan 2016: Updated demand forecast to correctly accommodate Cobb and Mill Creek embedded generators and updated generation and transmission outages.
    • 26 Feb 2016: Updated generation and transmission outages and updated hydrology dataset using the Electricity Authority's Hydrological Modelling Dataset.
    • 24 Mar 2016: Updated generation and transmission outages.
    • 28 Apr 2016: Updated generation and transmission outages.
    • 30 May 2016: Updated demand forecast - added 2015 hydro information - corrected minor inconsistency in hydro data - included Te Ahi O Maui generation and updated generation and transmission outages.
    • 28 Jun 2016: Updated generation and transmission outages.
    • 26 Jul 2016: Updated generation and transmission outages.
    • 23 Aug 2016: Updated generation and transmission outages.
    • 27 Sep 2016: Updated generation and transmission outages.
    • 27 Oct 2016: Updated generation and transmission outages.
    • 25 Nov 2016: Updated generation and transmission outages.
    • 20 Dec 2016: Updated generation and transmission outages.
    • 30 Jan 2017: Updated generation and transmission outages.
    • 28 Feb 2017: Updated generation and transmission outages.
    • 23 Mar 2017: Updated generation outages.
    • 21 Apr 2017: Updated generation outages for next two months.
    • 30 May 2017: Updated generation outages for next two months.