Trying to find the cheapest gas provider in New Zealand often feels like chasing a moving target — advertised prices shift, discounts get bundled, and what works for a small apartment might leave a family of five cold. This guide pulls together official comparison tools, provider data, and real talk from Kiwis who’ve been through the process so you can make a confident call.

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Major gas retailers in NZ: 5 (Mercury, Nova, Elgas, Genesis, Waitomo) · Popular LPG bottle size: 45 kg · Number of price comparison sites: At least 1 (PowerCompare)

Quick snapshot

1Confirmed facts
2What’s unclear
3Timeline signal
  • 2024 – Rising fuel prices in NZ prompt consumers to seek cheaper gas options
  • 2025 – Current snapshot; prices vary by provider, dual‑fuel discounts common
  • 2026 – Expected natural‑gas price increase per EIA outlook (global demand growth)
4What’s next
The upshot

No single provider is cheapest for every home. The winner depends on your consumption band, whether you have piped gas or LPG, and whether you can bundle with electricity. The smartest move: run your own numbers through a comparison tool before signing.

Key facts about gas providers and pricing in New Zealand
Number of major gas retailers 5
Typical LPG bottle size 45 kg
Average weekly LPG usage for heating (variable) 2–3 kg per day
Natural gas price regulation Partially regulated by Commerce Commission
Powerswitch average reported savings ≈ NZ$450 a year (Powerswitch – Consumer NZ)
Billy launch date 26 March 2025 (Gas Industry NZ – regulator)

Who is the cheapest gas supplier in NZ?

That depends on how much gas you use and what type of gas you need. Piped natural gas and bottled LPG follow different pricing structures, and each retailer tailors its plans to different consumption bands.

What factors affect gas prices?

Three variables dominate: your annual usage (kWh for piped gas, kg for LPG), your location (regional delivery charges vary), and whether you take a dual‑fuel plan that combines electricity and gas. The Commerce Commission partially regulates natural‑gas lines charges, but retail prices are set by each provider.

Comparison of major providers: Mercury, Nova, Elgas, Genesis, Waitomo

For Auckland piped gas customers, That Power Guy (independent price analyst) shows that the cheapest provider shifts by usage tier:

  • Up to 5,000 units/year → Mercury Energy Low User is cheapest.
  • 5,000–10,000 units/year → Genesis Energy Standard User is the best pick.
  • Above 10,000 units/year → Contact Energy takes the lead.
  • Between 5,000 and 20,000 units, Nova was about NZ$35 cheaper per year than Genesis on Energy Online.

Mercury says it is a leading gas supplier and allows sign‑up online (Mercury – NZ utility). Elgas specialises in bottled LPG and does not appear in the piped‑gas comparison, while Waitomo markets itself as a budget LPG provider without specifying a price advantage in the available data.

Bottom line: There is no universal cheapest supplier. Light users (under 5,000 units) should start with Mercury; medium users (5,000–10,000) with Genesis; heavy users with Contact. The catch: you must run a comparison with your own address to confirm.

How much does a 45 kg gas bottle cost in NZ?

None of the official sources we reviewed quote a fixed price for a 45 kg LPG bottle. Prices change frequently and depend on delivery distance, contract length, and whether you own or rent the bottle.

Price ranges from different suppliers

Mercury and Elgas both supply bottled LPG but do not publish standard list prices online (Mercury – gas supplier). The best way to get a current price is to request a quote through a comparison tool such as Powerswitch (Consumer NZ service) or Gas Industry NZ’s comparison page.

How long does a 45 kg gas bottle last in NZ?

Lifespan depends heavily on usage. For a typical household using a gas stove and hot water, a 45 kg bottle may last 2–3 months. If you also run a gas heater for several hours a day in winter, that can drop to 4–6 weeks. The average daily consumption for heating alone is 2–3 kg per day, according to industry data.

The paradox

LPG bottle costs are opaque. The very information you need to compare is often hidden behind a quote form. That makes using a tool like Powerswitch or Billy essential — they force the retailer to show you a real number.

How to find cheap gas in New Zealand

Finding the best deal takes about 15 minutes of your time but can save hundreds of dollars a year. Here’s the step‑by‑step approach backed by the official tools.

Use comparison sites like PowerCompare

Power Compare (NZ comparison site) lets you enter your address and see plans from multiple providers side by side. Powerswitch (Consumer NZ tool) claims average savings of around NZ$450 a year. MoneyHub recommends comparing prices using annual usage and adjusting GST‑inclusive figures by dividing by 1.15 to get an apples‑to‑apples comparison (MoneyHub – personal finance guide).

Check for dual‑fuel bundles

Several retailers offer a discount when you take both electricity and gas from them. Mercury and Genesis both market dual‑fuel plans, and Pulse Energy sells a combined electricity‑gas‑broadband package (Pulse Energy – NZ retailer). The discount typically shaves NZ$50–150 off your annual energy bill.

Monitor local station prices via apps

For LPG bottle refills, apps such as Gaspy track station prices. While not a direct comparison of delivery prices, they help you see regional trends. The MBIE energy prices dataset (government statistics) tracks petrol, diesel, and natural gas wholesale trends but not individual LPG bottle prices.

Bottom line: Use a comparison tool with your own address and usage. Combine gas with electricity if you can. Skip the guesswork — the tools are free and take 15 minutes.

Why is Waitomo fuel cheaper?

Waitomo Group positions itself as a budget LPG supplier. In its own words, the company aims for “fairer fuel prices.” However, the available comparison data from That Power Guy does not include Waitomo in piped‑gas pricing tables, and no official bottle‑price for Waitomo appears in the sources we reviewed.

Waitomo’s cost structure and business model

Waitomo operates with a lean cost structure: it owns its own bulk storage and focuses on direct consumer delivery rather than franchised outlets. That may allow it to undercut larger competitors, but without a published price it’s impossible to confirm by how much.

Customer reviews and Reddit opinions

On New Zealand subreddits, users occasionally mention Waitomo as a “no‑frills” option. The general sentiment is that Waitomo offers competitive rates for LPG bottle swaps, but the feedback is anecdotal and lacks the rigor of a systematic price comparison.

What to watch

Waitomo’s lack of presence in the major comparison tools means you must contact them directly for a quote. Factor in delivery fees and contract terms — the sticker price may not be the whole story.

Is natural gas expected to go up in 2026?

Global energy markets and domestic demand point toward upward pressure on natural‑gas prices. The U.S. Energy Information Administration (EIA) projects moderate price increases in 2026 due to rising LNG demand and tighter supply, though New Zealand’s isolated market may diverge.

Current natural gas price trends (EIA data)

The MBIE energy prices dataset (New Zealand government statistics) shows moderate wholesale increases over the past 12 months. Globally, the EIA’s 2025 Short‑Term Energy Outlook forecasts Henry Hub spot prices to average around US$3.50 per million Btu in 2026, up from 2024 levels. For NZ consumers, pipeline and distribution charges add a local multiplier.

Factors influencing future prices: supply, demand, global markets

New Zealand’s natural gas is produced domestically (predominantly from the Taranaki basin). Declining reserves and the government’s policy stance on new exploration permits contribute to supply uncertainty. Meanwhile, demand from industrial users remains steady. If import dependency grows, international prices will weigh more heavily on local retail rates.

Bottom line: Expect modest increases in 2026, driven by global markets and local supply constraints. Locking in a fixed‑price plan now might protect you from a mid‑year hike.

The trade‑off

A fixed‑price plan gives you certainty, but you might miss out if prices drop. For the average household, the peace of mind outweighs the small premium — especially with 2026 forecasts pointing up.

Comparison: Pipelines vs Bottles — What’s the difference?

One key distinction that affects every price discussion: piped natural gas and bottled LPG are not interchangeable products. Piped gas is metered and billed per kWh; LPG is sold per kilogram or per bottle refill. Switching from one to the other requires different appliances and a new connection.

Factor Piped natural gas Bottled LPG
Delivery Continuous supply through city mains Delivered in bottles (typically 45 kg) or tank
Pricing unit ¢ per kWh + daily fixed charge $ per kg or per bottle swap
Typical cost per year (Auckland, medium use) ≈ NZ$800–1,400 ≈ NZ$1,000–1,800 (estimate, depends on usage)
Regulation Lines charges regulated by Commerce Commission Unregulated retail price
Switching cost Low (change retailer, same pipe) Moderate (bottle deposit, delivery fees)
Best for Homes already connected to the gas network Rural/off‑grid homes, rental properties

Bottom line: Piped gas is generally cheaper per unit of energy, but only available in areas with gas mains. LPG gives you flexibility but costs more per kWh. The pattern: choose based on your property’s connection, not just the sticker price.

How to switch gas providers in NZ

Switching is straightforward — usually a few minutes online or a phone call. No disruption to your supply occurs because the gas still flows through the same pipes (or the same bottle depot handles the swap).

Steps to switch

  1. Compare current plan using Powerswitch (Consumer NZ tool) or Gas Industry NZ comparison page.
  2. Select the new provider and plan. Provide your address and estimated annual usage.
  3. The new provider handles the transfer and notifies your current retailer. The switch takes 2–5 business days.
  4. If you are switching LPG bottle suppliers, check if you need to return the current bottle and pay a deposit for the new one.

MoneyHub notes the entire comparison process can take about 10–15 minutes (MoneyHub – personal finance guide).

Why this matters

The average Kiwi household overpays by about NZ$200 a year by failing to review their gas plan annually. A 15‑minute comparison can recover that money with almost zero effort.

Timeline: Key events in NZ gas pricing

  • 2024 – Rising fuel prices prompt consumers to seek cheapest gas options. Social‑media threads on r/auckland and r/newzealand discuss dual‑fuel discounts.
  • 2025 – Current snapshot. Comparison tools (Powerswitch, Billy) gain traction. Providers like Mercury and Nova compete on plan features rather than headline rates.
  • 2026 (projected) – Expected natural‑gas price increase per EIA outlook. Consumers who locked in fixed‑price plans during 2025 may avoid the hike.

What we know vs what remains unclear

Based on the available data, some facts are solid while others require caution.

Confirmed facts

  • At least five major gas retailers operate in NZ (Mercury, Nova, Genesis, Elgas, Waitomo).
  • Powerswitch claims average savings of NZ$450 a year (Powerswitch – Consumer NZ).
  • Billy comparison tool launched March 2025 (Gas Industry NZ – regulator).
  • Dual‑fuel discounts are offered by multiple providers (Mercury – NZ utility).
  • Natural‑gas lines charges are partially regulated.

What’s unclear

  • Exact cheapest provider without personalized usage data.
  • Actual current price of a 45 kg LPG bottle from any retailer.
  • How long a 45 kg bottle lasts for every household (varies widely).
  • Specific future natural‑gas price forecasts for NZ (only global EIA data available).

What Kiwis on Reddit are saying

While not authoritative, forum discussions reveal real‑world frustrations and tips. A popular r/auckland thread from early 2025 asked: “Who’s the cheapest piped gas company in Auckland?” The top comment recommended using Powerswitch and noted that a dual‑fuel deal with Genesis had cut their annual bill by NZ$120. Another user warned that “Elgas quotes are always higher than what you actually end up paying after delivery fees.” These anecdotes underscore the need for a live quote rather than trusting advertised rates.

“[I] switched to Nova using Powerswitch – saved about $30 a month and the process took five minutes online.”

— Reddit user, r/auckland (2025)

“We’re for fairer fuel prices. By keeping overheads low, we pass the savings on to Kiwi households.”

— Waitomo Group website (paraphrased from marketing material)

Bottom line: Reddit consensus: always compare, always bundle if you can, and call the provider to confirm hidden fees. The implication: the advertised rate is rarely the final bill.

Consumers who want to combine their gas supply with electricity and broadband should consult the best power, gas, and internet deals for a detailed comparison of bundled options.

FAQs about cheapest gas providers in NZ

How do I switch gas providers in NZ?

Use a comparison tool like Powerswitch or Billy to find a better plan, then sign up online. The new provider handles the transfer — no interruption to your supply. For LPG, you may need to arrange bottle pick‑up/swap.

What is the cheapest gas provider in Auckland?

For piped gas, That Power Guy data shows Mercury Low User for low consumption, Genesis Standard for medium, and Contact for high consumption. Run a live comparison for your address to get an accurate answer.

Does Elgas offer competitive prices for LPG?

Elgas is a specialist LPG supplier, but its prices are not publicly listed. Users on forums report that Elgas quotes are often higher after delivery fees. It’s worth comparing with Mercury LPG and Waitomo.

How does a dual‑fuel discount work?

A dual‑fuel discount applies when you buy both electricity and gas from the same retailer. The discount is typically a fixed dollar amount (e.g., NZ$100‑150 per year) or a percentage off the gas portion. Check the plan’s terms.

What is the price difference between piped gas and LPG?

Piped natural gas is generally cheaper per kWh than LPG. However, LPG offers flexibility for off‑grid homes. See the comparison table above for typical cost ranges.

Are there any government rebates for gas heating?

No national rebates currently exist for residential gas heating. Some regional councils offer insulation grants, but they are not specific to gas.

How often do gas providers change their rates?

Variable plans can change quarterly; fixed‑price plans remain stable for the contract term (usually 12–24 months). Review your plan annually or whenever you receive a rate‑change notice.

Can I negotiate a cheaper gas rate?

It’s worth asking, especially if you have been a loyal customer for several years. Some providers will match a competitor’s price or waive the daily charge for a fixed period.

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