Queenstown grid fix could add up to $600 a year to power bills
Thursday, 29 January 2026
Households could pay up to about $600 a year extra in line charges to keep Queenstown’s lights on, as power companies back a transmission upgrade that carries a price tag of up to $225 million.
Transpower, Aurora Energy and PowerNet have confirmed their preferred solution is a new 110kV line from Cromwell into the Wakatipu, after modelling showed solar and batteries can only delay, not avoid, a major grid upgrade.
The upgrade comes as the wider region – from Queenstown and Wānaka through to Dunedin and Central Otago – faces rising visitor numbers, new housing and a shift to electric heating and vehicles, all pushing Queenstown’s single existing line towards its limit and forcing a decision on who pays for the next big build.
Costings released through the Energising Queenstown consultation show the favoured Cromwell–Arrow Junction double-circuit line – Option 2 – is expected to cost about $134m to $225m to build.
On current pricing rules and medium population growth, that would add an estimated $360 to $610 a year to a typical customer’s bill by 2032, easing to $270 to $450 by 2050 as more users connect.
Aurora Energy chief executive Richard Fletcher said consultation feedback showed strong backing for that choice and for a mix of grid upgrades and local technology.
“Many supported a new 110kV line from Cromwell,” he said. “People felt this was a good, balanced choice because it’s cost-effective and can grow with Queenstown.”
The preferred Cromwell option is sized to support about 26,600 homes, 760 small and medium businesses and more than 150 large commercial users, reflecting not just housing growth but new hotels, data-hungry tourism operators and a wave of electrified heating and EV chargers.
A smaller single-circuit Cromwell line (Option 1) is priced at about $122m to $204m, with modelled bill impacts of$330 to $550 a year in 2032 and $244 to $408 in 2050. However, because it would need further upgrades around 2045 if high growth continues, planners say its lifetime cost could end up higher than the larger build.
A more heavily “future-proofed” Cromwell route, Option 3, would use a double-circuit 220kV line, run initially at 110kV. That would cost about $154m to $255m, with an estimated customer impact of $415 to $690 a year in 2032 and $310 to $510 in 2050.
The outlier is Option 4, a new southern supply from Roxburgh to Jacks Point. Its longer route and new substation push the project cost out to about $270m to $460m, and the modelled impact on customers to $730 to $1,240 a year in 2032 and $540 to $920 in 2050 – about double the Cromwell options.
All four options assume a five to seven year programme, stretching to six to eight years for the Roxburgh line, meaning decisions in the next year or so will lock in how much households and businesses pay for decades.
The Cromwell options would lift capacity into Queenstown from 108MW today to between 240MW and 300MW, enough to support tens of thousands of homes plus hundreds of hotels, shops and other commercial loads as the district electrifies heating and transport.
Alongside the new line, the partners are backing a parallel “Queenstown Electrification Accelerator” to speed up rooftop and utility-scale solar, batteries and smart EV charging.
The plan is to use those to shave winter peaks and buy two to four years of extra headroom on the existing line, while annual checkpoints on demand and solar uptake decide when to push the button on construction.
The push for a new Queenstown line also comes as Transpower seeks to do a separate $193m upper South Island upgrade to strengthen supply from the Waitaki hydro scheme into fast-growing areas such as Christchurch and Selwyn.