Quarterly survey of domestic energy prices
- Quarterly Survey of Domestic Electricity Prices to 15 November 2013 [168 KB PDF]
- Quarterly Survey of Domestic Electricity Prices to 15 November 2013 [872 KB XLSX]
Notes explaining the methodology used in the Quarterly Survey of Domestic Electricity Prices.
What is the Quarterly Survey of Domestic Electricity Prices (QSDEP)?
The QSDEP reports each retailer’s electricity price for an assumed residential customer in each network pricing area and the lines component of that price (prices and lines components include GST).
Retail electricity prices reflect the cheapest low user tariff available, which doesn’t require customers to sign a fixed term contract. It is assumed that the customer pays their bill on time and receives any available prompt payment discount. Calculations are based on household electricity consumption of 8,000 kWh per year, assuming a typical metering configuration.
What is the purpose of the QSDEP?
The QSDEP is used to monitor high level trends in regional electricity prices for the modelled customer. This is used in market analysis and policy decisions. However, it does no reflect what an individual customer actually pays for electricity. The emergence of a wide range of discounts that are not reflected in tariffs, e.g. fixed term contracts and door-to-door sales mean that price trends apparent in the QSDEP should be treated with caution.
What are the key assumptions made by the QSDEP?
The customer consumes an average amount of electricity in a year (8,000 kWh of electricity per year).
Retail electricity prices reflect the cheapest low user tariff for a customer without a fixed term contract.
The customer is assumed to pay their bill on time and receive any available prompt payment discount.
Metering configurations in each network pricing area are based on the configuration that had the most connection points at the time the survey began (February 2000). In most areas metering is assumed to be 60% uncontrolled and 40% controlled or Composite (one meter with ripple control).
Market share is an approximation based on Installation Control Point (ICP) data. ICP data includes residential consumers, as well as commercial and industrial consumers. Approximately 87% of ICPs are residential customers.
Tariff data is sourced from Consumer NZ.
Lines charge information is collected separately for all electricity network companies through disclosures on their website.
Change to the QSDEP as at 15 November 2013
The QSDEP definition has been amended to include direct debit and/or electronic payment discounts, methods of payment that are now common e.g. customers who are with Powershop and customers signed up to Contact Energy’s Online OnTime discount are required to pay by these methods. The impact of this change is that the national average electricity price has been revised down on average by 0.9 c/kWh since the introduction of Contact Energy’s Online OnTime discount.
For important information about the methodology of this survey, see Notes to Quarterly Survey.
For older issues of the Quarterly Survey of Domestic Electricity Prices, see the Archive of electricity price surveys.
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To find out more about the Quarterly Survey, please contact the Energy Information & Modelling team.
The Quarterly Survey of Domestic Electricity Prices by Ministry of Business, Innovation and Employment is licensed under a Creative Commons Attribution 3.0 Unported License.