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


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.


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


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


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.


Metering snapshot

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  1. Retail reports are released after the 10th business day of each month. The next scheduled release is due on 15/09/2017. The reports are built off a live system and the data is subject to change as registry events are processed (e.g. backdated corrections or withdrawn switches).
  2. Metering statistics are based on active ICPs with metering data in the registry, including the meter type(s) and categories at these connections. ‘ICP share’ is the share of ICPs with the meter type or category in the selected region and market segment by entity. ‘Proportion of entity's ICPs’ is the proportion of each entity's ICPs in the region and market segment of the meter category or type selected.
  3. Meter types described here are not mutually exclusive. An ICP may have an AMI meter or not and this may be certified as NHH or HHR. Meter types ‘AMI’, ‘HHR certified’, ‘NHH certified’, provide information on ICPs with each meter type independently. ‘HHR certified’ includes all ICPs with larger time of use meters that are not tagged as AMI. ‘AMI (HHR certified)’ refers to ICPs with AMI meters that are certified as HHR and ‘AMI (NHH certified)’ are ICPs with AMI meters that are only certified as NHH. ‘NHH certified (legacy)’ are ICPs with legacy meters that are not AMI and are certified as NHH. ICPs that are ‘unmetered’ such as street lighting are defined as those with meter categories 0 or 9. More information on meter types can be found in Schedule 15.2 of the Code.
    Meter categories generally increase with the capacity of the connection to the network with household meters being category 1. As the category increases metering installations must meet more stringent compliance and certification requirements given the volume of electricity capable of being consumed by load at the ICP. More information on meter categories can be found in table 1 of schedule 10.1 of the Code. The data report (available by the icon at the top right) lets users select ‘All types’ or ‘All categories’ an option not available in the graphical reports, that allows them to download data for all types or categories in a single file.
  4. Market segment breakdowns are available from September 2013 when ANZSIC codes were introduced into the registry in a field maintained by the trader. No breakdown is available at NSP level.
    Market segments are not mutually exclusive. Residential connections have no ANZSIC code. Small and Medium Enterprise (SME) connections are defined as those assigned meter categories 1 and 2 (low voltage up to 500A) with an ANZSIC code excluding those relating to central or local government and other utility services. Industrial connections have ANZSIC code from A through E and commercial connections F through Z. More information on ANZSIC codes is available at
  5. Retail entities are brand, trader, and parent company. Some snapshot brand information is available at 31 December each year from 2011. Trader information is derived from the registry and parent company stats are a simple sum from trader data, including switches. Parent companies track ownership changes through time. Direct purchasers/generators in this report are traders with ICPs that are not active as retailers and directly purchase from, or sell to, the clearing manager. These companies are Alinta, Cold Storage Nelson, Lloyd Wensley, NZ Aluminium Smelters, NZ Steel, NZ Wind Farms, and Onekaka Energy.
  6. MEPs (metering equipment providers) and MEP parent companies are other available entities. MEPs are responsible for the provision of metering services that underpin billing and reconciliation. MEPs are appointed by the trader at the ICP. Only up to the first 20 series are shown by default, others can be turned on by selecting them from the series filter drop down.
  7. Region types are either network based or derived from standard statistical boundaries. Network based regions are network supply points (NSP), network reporting regions and zones, mappings are available in the NSP table which is available as a wholesale report. Other regions are derived from ICP location data and statistical boundaries (2013 census). ICPs without location data default to the location of their NSP. Main centres use Territorial Authority boundaries (city councils) where Wellington includes Porirua City, Upper Hutt City, Lower Hutt City, and Wellington City. The data report lets users select 'All regions' (where the regions are not the data series) to get data for all regions in a single file. Regions are listed North to South except for NSPs
  8. The 'network participant' region type is different from network or statistics based regions. It reflects the owner of the distribution assets that an ICP is directly connected to, or the participant responsible for them. It does not roll-up ICPs in embedded networks (reconciliation type EN) to the grid connected network owner (reconciliation type GN). In this way it is not strictly a region as the same network participant can operate various unconnected distribution assets across the country and these are aggregated in this reporting. Grid connected network participants are listed first, and the remainder are listed alphabetically. Network participants with less than 10 ICPs connected at any time during the period the report covers have their names withheld.
  9. For more information on specific terms and their definitions please visit the glossary on this website.