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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.


Installed distributed generation trends

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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. The Authority is aware of some data integrity issues early in these series and is working with auditors and participants to have these issues resolved.
  3. Distributed generation (DG) statistics are available from September 2013 following inclusion of DG distributor populated fields into the registry with the implementation of Part 10 and 11 code changes. This report covers ICPs with an installation type of 'B' (both load and generation) or 'G' (generation only) and includes SB ICPs. The ICP uptake rate is calculated as the percentage of active ICPs that have DG installed in the market segment and region selected. Previous reporting on DG is available at
  4. Fuel types available are bio-mass (includes wastes and residues); electric vehicle (includes fuel cells); fresh water (includes stored, pumped and run of river); geothermal; industrial process (includes heat, excludes bio-mass); liquid fuel - liquid fuel (includes diesel, petrol and fuel oil); natural gas; solar; tidal; wave; wind; other (includes any process that doesn't fit neatly into another category including multiple generators of different fuel types); and undefined (this code exists only to support the creation of the fuel type field and cannot be selected by distributors). These fuel types are defined under SD-020 in the registry functional specification at
  5. Capacity is the name plate generation capacity in kW of the generating plant at an ICP. Where there are multiple generators at an ICP the capacity is summed. Part 6 of the code sets requirements in place for connection and operation of DG with installation capacities that are 10kW or less and above 10kW. This report allows results to be filtered by connections above and below this 10kW threshold. The report also allows users to investigate the total installed capacity, average connection capacity installed, or the average capacity of new installations in any month. To be very clear, removed installations will impact the installed results but not the results for new installations.
  6. 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
  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.