Energy Pulse NZ
Updated Jan 2026
On this page 100% Renewable Price Spikes Gentailers Demand Response Onslow Thermal

The Debates

Six questions where smart people disagree. We present both sides — you decide.

Debate 01

Is 100% renewable electricity the right target — or would 95% be smarter?

NZ has set an aspirational goal of 100% renewable electricity by 2030. We're currently at ~85%. The question: is that last 5-15% worth the cost and complexity?

Active policy debate
The Case For 100%
"Go all the way — it's the only defensible target"
  • Climate targets require full decarbonisation; anything less locks in fossil infrastructure
  • Technology costs (batteries, wind, solar) are falling rapidly — what looks expensive today won't be in 2030
  • Retaining gas/coal capacity creates stranded asset risk and maintains fossil fuel dependency
  • NZ's brand as a clean, green nation has real economic value
Voices: Climate Change Commission, environmental groups, some generators (Meridian)
The Case For Pragmatism
"The last 5% costs more than the first 95%"
  • Achieving 100% requires massive overbuilding of renewables or expensive storage for rare dry-year/calm-weather events
  • Gas peakers running 2-5% of the time have minimal emissions but provide critical reliability
  • Capital is scarce — better spent on transport electrification where emissions impact is greater
  • Energy security matters; 2024's crisis showed the cost of insufficient backup
Voices: IEA, some economists, Major Electricity Users Group, industry analysts
The Real Trade-off
This is fundamentally a question about how much insurance to buy. The 100% camp sees fossil backup as a moral and strategic liability. The pragmatists see it as cheap insurance against rare but real reliability events. Both acknowledge NZ should get to at least 95% — the fight is about the final stretch.
Debate 02

Are electricity price spikes market failure — or the market working as designed?

Winter 2024 saw wholesale prices exceed $800/MWh (normal is ~$100). Factories shut down. Politicians called it "profiteering." But some economists said the system did exactly what it should.

Under active review
Market Failure View
"The system is broken and consumers are paying the price"
  • Four companies control 85% of the market — that's not real competition
  • Gentailers profit from scarcity; they have little incentive to build enough capacity to prevent price spikes
  • $2.7B in annual gentailer profits while households face energy hardship is a policy failure
  • High prices haven't delivered promised investment — generation capacity up only 15% in 25 years
Voices: Consumer NZ, independent retailers (Electric Kiwi, Octopus), some politicians
Market Design View
"Scarcity pricing is doing its job — painfully but correctly"
  • High prices signal scarcity, reduce demand, and attract investment — that's the point
  • The Electricity Authority found the market "responded as expected" in 2024
  • Gentailer margins were actually lower during the crisis than normal periods
  • The real problem is fuel supply (gas decline) and delayed projects, not market design
Voices: Electricity Authority, ERANZ, BusinessNZ Energy Council, some economists
The Real Trade-off
Price spikes hurt in the short term but may be necessary to signal long-term investment needs. The question is whether NZ's specific market structure — with vertically integrated gentailers — amplifies or dampens those signals. Critics say gentailers profit from volatility they could prevent. Defenders say breaking them up would raise prices 25%.
Debate 03

Should the gentailers be broken up?

Mercury, Meridian, Genesis, and Contact both generate and retail electricity. Critics say this stifles competition. Defenders say it provides stability. The Electricity Authority is now requiring "non-discrimination" rules.

Regulatory changes underway
Break Them Up
"Vertical integration is the root of our competition problem"
  • Gentailers can supply their own retail arms at cost while competitors pay wholesale prices
  • Independent retailers have struggled to compete — several had to stop accepting customers
  • Generation profits can mask retail inefficiency, reducing pressure to innovate
  • Structural separation worked for Telecom/Chorus; electricity needs the same treatment
Voices: Consumer NZ, independent retailers, some economists, 2019 Electricity Price Review (partially)
Keep Them Integrated
"Vertical integration protects consumers from volatility"
  • Internal hedging lets gentailers offer stable retail prices despite wholesale volatility
  • Economic research shows consumers fare worse in markets where integration is prohibited
  • Gentailers are doing "the heavy lifting" on $10B+ of new renewable investment
  • Forced separation could raise retail prices by 25% as retail arms must now profit independently
Voices: ERANZ, gentailers, some academic economists, BusinessNZ
The Real Trade-off
The current "non-discrimination" rules try to split the difference: keep integration but force gentailers to offer the same terms to rivals. Critics say this won't work because gentailers will simply raise internal prices rather than share discounts. The deeper question: is NZ's market too small and too hydro-dependent for textbook competition to work?
Debate 04

Is demand response the underutilized solution — or overhyped?

Rather than building more generation for peak demand, what if we just used less electricity when supply is tight? The Electricity Authority estimates 450MW of demand flexibility could be available today.

Growing attention
Underutilized
"Demand flexibility is our cheapest, fastest option"
  • Transpower estimates every GW of avoided peak demand saves $1.5 billion in infrastructure
  • Smart EV charging, hot water control, and industrial load-shifting are proven technologies
  • Tiwai Point's demand response in 2024-25 demonstrated large-scale flexibility works
  • Current market rules don't adequately reward demand flexibility — fix the incentives
Voices: EECA, Electricity Authority, flexibility providers (Simply Energy), technology advocates
Overhyped
"Demand response can help at the margins but can't solve the core problem"
  • Residential flexibility is fragmented, hard to aggregate, and consumer uptake is slow
  • Industrial demand response often means lost production and export revenue — not a free resource
  • Dry-year shortfalls last weeks or months, not hours — you can't defer hot water heating for a month
  • NZ's 2024 crisis required industrial shutdowns — that's not "flexibility," that's economic harm
Voices: Major Electricity Users Group, some generators, industrial consumers
The Real Trade-off
Demand response clearly has a role — but how big? It's excellent for short-term peaks (hours) but struggles with longer scarcity events (weeks). The optimists see smart technology unlocking massive latent flexibility. The skeptics point out that when Methanex or NZAS cut production, that's not "flexibility" — it's economic damage wearing a friendlier label.
Debate 05

Lake Onslow: game-changing infrastructure or white elephant?

A proposed $16 billion pumped hydro scheme in Central Otago could store 5 TWh — enough to cover NZ's entire dry-year shortfall. The previous government championed it. The current government shelved it. Now a private consortium wants to revive it.

Currently shelved but not dead
Build It
"The only real solution to dry-year risk at scale"
  • Pumped hydro is proven technology — 94% of global energy storage is pumped hydro
  • At scale, it's cheaper per kWh than batteries and lasts 100+ years
  • Would structurally lower wholesale prices by removing scarcity rents — potentially offsetting the entire capital cost
  • Multi-purpose benefits: flood control, water supply, grid stability, recreation
Voices: Earl Bardsley (original proposer), some engineers, Clutha Pumped Hydro Consortium, former Labour government
Don't Build It
"A gigantic boondoggle that would crowd out better alternatives"
  • Cost has ballooned from $4B to $16B — and megaprojects always overrun
  • Won't be ready until late 2030s at earliest — too late for current challenges
  • Business case returns only 40-50 cents per dollar spent
  • Distributed alternatives (batteries, geothermal, wind overbuild) may be cheaper and faster
Voices: National government, BusinessNZ Energy Council, Energy Resources Aotearoa, some economists
The Real Trade-off
This is a bet on the future. Onslow solves dry-year risk permanently but requires $16B upfront and a decade to build. The alternative — a portfolio of smaller solutions — is more flexible but may cost more over 40 years and leaves residual dry-year risk. The private consortium revival adds a new variable: would commercial investors build what government won't?
Debate 06

Should NZ build more thermal peaking capacity?

NZ has no new backup generation built in over a decade. The Taranaki Combined Cycle plant retired in 2025. Gas supply is declining. Should we build new gas or even diesel peakers — or would that lock in fossil infrastructure?

Central to current policy debates
Build Peakers
"Energy security requires firm dispatchable capacity"
  • Renewables are intermittent; you need something that runs when there's no wind, sun, or water
  • Gas peakers running 2-5% of the time produce minimal emissions but prevent blackouts
  • The market won't build backup capacity on its own — the 2024 crisis proved this
  • LNG import terminal + new peakers could bridge NZ until battery storage scales
Voices: Current government, industry security advocates, some generators (Genesis), MEUG
Don't Build Peakers
"New fossil infrastructure is a stranded asset waiting to happen"
  • Building gas plants locks in 20-30 years of fossil fuel dependency
  • Capital would be better spent on batteries, demand response, and renewable overbuild
  • Gas supply is declining anyway — new plants would need expensive LNG imports
  • Conflicts with 100% renewable target and net-zero commitments
Voices: Climate advocates, Greens, some renewable generators, environmental groups
The Real Trade-off
The gas paradox: NZ's reliance on gas for dry-year firming is increasing even as domestic gas supply declines. Building new thermal is politically fraught but potentially necessary for reliability. The alternative — betting on batteries and demand response scaling fast enough — is cleaner but riskier. Winter 2024 showed the cost of getting this wrong.

A note on sources: The positions above are synthesized from public statements by the Electricity Authority, Climate Change Commission, Consumer NZ, ERANZ, BusinessNZ Energy Council, Major Electricity Users Group, industry reports, academic research, and media coverage. We've aimed for accuracy and balance — if you think we've misrepresented a position, let us know.

Last updated: January 2026