Monitoring and focus reports
The Commission produces quarterly monitoring reports, which monitor the performance of engine fuel markets in New Zealand under the Fuel Industry Act 2020.
Fuel price monitoring – Middle East conflict
The Commission is publishing additional regular fuel price monitoring reports in response to the conflict in the Middle East and the impact on global fuel prices. Retail pricing information is sourced from a 3rd party provider and is based on crowd-sourced information about prices at all retail stations. This reporting is distinct to the quarterly reports we produce, with different data sources and periods which means they are not directly comparable.
25 June 2026: Both refined product costs and average retail prices have fallen this week for all fuel grades, with Diesel prices dropping by 6%.
Since 28 February, the national average prices for Regular 91 and Premium 95 have risen by 19% and 21% respectively, and the national average price for Diesel has increased by ~45%.
The price-cost spread for Diesel remains higher than for the same period in the previous three years. Information received from fuel companies has confirmed that there have been additional costs incurred to import Diesel fuel, most notably during April and May. These additional costs mean that the average price cost spread for diesel will decrease. We will incorporate this new information into our monitoring data from next week.
Quarterly monitoring reports
These reports are based on the Commission’s analysis of information provided by fuel companies each quarter, and provide insights into the competitive performance of engine fuel markets in New Zealand.
These reports have been published since November 2022, with information including:
- volumes and prices as reported by importers in both the wholesale and retail market
- volume-weighted and regional level cost estimates importer costs and average pricing
- terminal gate pricing and wholesale market activity
Current report
Note: the Middle East conflict began on February 28 2026. Quarterly reports from Quarter ending 31 March 2026 may show the impact of supply chain disruption and price volatility in results. For the most current analysis on prices and importer costs since the Middle East conflict began, please view our weekly monitoring reports.
Explanatory note
The Commerce Commission has developed an importer cost model using a range of data sources to support its assessment of competition in engine fuel markets. The model has been developed in consultation with industry experts and fuel market participants.
Read more on our Fuel quarterly monitoring report explanatory note.
Previous reports
Quarterly fuel monitoring report (Quarter ending December 2025) ( 4 MB, PDF )
Quarterly fuel monitoring report (Quarter ending September 2025) ( 4 MB, PDF )
Quarterly fuel monitoring report (Quarter ending June 2025) ( 3.8 MB, PDF )
Quarterly fuel monitoring report (Quarter ending March 2025)
Quarterly fuel monitoring report (Quarter ending December 2024)
Older reports
Reports older than the previous calendar year.
Focus reports
In addition to the quarterly reporting, the Commission occasionally publishes focus reports that supplement the analysis of quarterly information disclosure data.