NZ energy data
About this snapshot.
NZ Energy Data is a static historical snapshot of New Zealand’s energy system (electricity generation and demand, prices, gas and oil, network reliability and emissions) presented as interactive charts on this site. It is modelled on US Energy Data (Institute for Progress / Hannah Ritchie), adapted to New Zealand sources and the Electricity Authority’s network reporting regions.
Nothing here refreshes on a schedule. The numbers were downloaded once (14–15 September 2026), tidied into long-format CSVs and baked into JSON for the charts. When agencies revise history, this page will not update unless we rebuild the snapshot.
Methods
Raw workbooks and CSVs live under scripts/nz-energy/raw/ (not in git). Parsers in parse_*.py write tidy CSVs with one row per observation: period, region, series, unit, value. build_site.py turns those into per-chart JSON and the page catalog. The browser runtime (nz-energy.js) draws each chart with vendored D3 v7.
Regional charts use the Electricity Authority’s ~40 network reporting regions (lines-company areas), grouped into zones and islands. Boundaries come from EMI’s 2016 GeoJSON, simplified for the web. Retail price towns and distributor (EDB) reliability series keep the source’s own geography.
Live or real-time market data is out of scope. Capacity factors, renewable shares and national aggregates are recomputed from the tidy series where noted on each chart.
Sources
| Publisher | What we used | Link |
|---|---|---|
| MBIE | Electricity, gas, oil, coal, energy balances, energy prices, QSDEP retail survey, weekly fuel prices, petroleum reserves, energy-sector greenhouse gas emissions | Energy statistics |
| Electricity Authority (EMI) | Metered generation and grid offtake, wholesale price trends, network supply points and region boundaries, modelled residential bills, solar installations, retailer market share | emi.ea.govt.nz |
| Commerce Commission | EDB information disclosure: SAIDI/SAIFI, ICPs, circuit length, line charge revenue, opex/capex, RAB (disclosure years ending 31 March) | EDB disclosures |
| data.govt.nz | Mirror of MBIE weekly fuel price monitoring CSV | catalogue.data.govt.nz |
MBIE asset files were retrieved via the Internet Archive where Incapsula blocked automated download; contents match MBIE’s published files. EMI is being replaced by the Authority’s “Data and insights” hub; URLs may move. Figure.NZ’s QSDEP table (HTTP 410) was not used.
Licence and reuse
Chart pages and our presentation of this material are offered under Creative Commons Attribution 4.0 (CC BY 4.0). Please credit “NZ Energy Data / Galt Industry” and link back.
Underlying data remains subject to each publisher’s terms. MBIE, the Electricity Authority and the Commerce Commission publish official statistics for reuse with attribution; check their sites for the current licence text.
Every chart has a table view and can be opened on its own page for embedding or CSV-oriented inspection of the plotted series.
Contact
Questions or corrections: use the contact details on the main Galt Industry site. If you need a newer MBIE quarterly release that was not archived at snapshot time, say which file and we can fold it into a rebuild.