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The trade volume report presents the number of New Zealand electricity futures and options contracts traded each business day on the ASX exchange. Users are able drill down into the volume data by instrument, location, commodity, duration and maturity, or expiration date.
The report is based on the trade volume of exchange-traded instruments, specifically New Zealand electricity futures and options contracts traded on the ASX platform.
The Authority acquires ASX data on a subscription basis and receives it following the close of trade each day. See http://www.asx.com.au/products/energy-derivatives/new-zealand-electricity.htm for a complete description of contract specification terms, including reference locations, units, commodity types, and contract durations. 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 http://www.asx.com.au/documents/products/energy-market-policy.pdf. The settlement price data is not made available.
The series filter enables specific locations to be selected.
Trade volume can be shown as a count of contracts traded, or the daily average number of contracts traded when ‘week’ or ‘month’ is selected on the time scale parameter. Weeks begin on a Monday.
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.
Maturity or expiry dates apply for all individual contracts for each instrument, commodity type and duration. Users can select a specific contract expiry date that, when combined with a location, commodity type, and duration, define a specific contract.
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. The implied spot price is not derived for peak contracts at this time.
Besides the number of contracts, we also express trade volumes in energy and dollar terms. Energy (GWh) is derived by multiplying the number of contracts by the contracted megawatts and the number of hours covered by the contract's duration, or the remaining duration in the case of contracts about to expire in the current period. Dollars are derived by summing up the product of the energy value and the settlement price. Energy (unadjusted GWh) is calculated slightly differently to Energy (GWh); the number of hours in the period of expiration is left unadjusted so that it does not account for the fact that the number of hours is diminishing as the period progresses. In the case of options contracts, we naively convert them to an energy basis as if they were futures contracts. Options can be excluded from the report by adjusting the instrument parameter.
Beginning on 9 November 2015, contract sizes were changed from 1.0 MW to 0.1 MW for all New Zealand electricity futures and options contracts traded on the ASX platform. For the purposes of consistent reporting on EMI, all New Zealand contracts prior to 9 November 2015 were multiplied by ten and are now expressed as contract equivalents.
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