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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.


Forward price curves – ETI

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  1. Forward price curves are derived from the settlement prices of exchange-traded instruments, specifically New Zealand electricity futures contracts traded on the ASX platform.
  2. A settlement price is determined for each contract at the end of every trading day, regardless of whether any trades for the particular contract occur. The process for determining the daily settlement price can be seen at The Authority acquires ASX data on a subscription basis and receives it following the close of trade each day. See for a complete description of contract specification terms, including reference locations, units, commodity types, and contract durations.
  3. Forward price curves are produced from a group of maturing contracts. The default forward price is calculated each trading day as the average settlement price of all long-dated Otahuhu baseload quarterly futures contracts. The default setting for this report shows a forward price curve for Otahuhu baseload quarterly futures superimposed over two Otahuhu average spot price series - the simple daily average and a 7-day moving average. The location parameter can be used to switch to the Benmore forward price curve.
    Alternative representations of the forward price for the selected location, commodity type and duration can be seen by selecting a maturity timeframe in the series filter:
    • the average settlement price of all long dated contracts (default - contracts maturing more than 12 months from each trade date)
    • the average settlement price of all short-dated contracts (contracts maturing within the next 12 months of each trade date)
    • the average settlement price calculated using all contract maturities
    • the average settlement price calculated using all contracts traded in a selected calendar year
    • the average settlement price of contracts expiring in the 12, 18, 24 and 30-month periods following the front two quarters. Settlement prices from the front two quarters, that is, the current and next quarters, are excluded from the calculation so that short-term hydrological conditions are unable to influence the forward price. The 12-30 month alternatives recognise that different agents have to make decisions over varying time horizons.
  4. Duration refers to the contract duration and are either monthly, quarterly, or calendar-year strips. Monthly contracts are introduced at the beginning of each quarter for the three months of the subsequent quarter. Quarterly contracts for all quarters in a year are introduced on the first trading day of the fourth quarter for the quarters of the year four years hence. Monthly and quarterly contracts may be traded from the time they are introduced until their date of expiration. Strips contain a strip of four quarterly contracts covering one calendar year. They are introduced at the beginning of the fourth quarter for the year four years hence, and may be traded up until the end of the first quarter in their year of expiration.
  5. Commodity types are baseload and peak. Baseload commodities refer to 0.1 MW of electrical energy per hour for every hour of the contract's duration. Peak commodities only exist for quarterly durations and refer to 0.1 MW of electrical energy per hour for all hours between 7:00am and 10:00pm on each business day within the contract's duration.
  6. For more information on specific terms and their definitions please visit the glossary on this website.