On June 9, 2026, Wellington, New Zealand marked its first step in achieving energy independence. The New Zealand Government announced it will build a 2 MW solar farm with an associated utility scale battery energy storage system on a remote island off the southern coast of New Zealand to achieve this goal by 2021. This project will help to reduce the impact of climate change on Stewart Island/Rakiura, produce stable, renewable energy for the approximately 400 residents of Stewart Island/Rakiura and provide jobs through a strong ecotourism industry, as well as cut down on the island's huge dependence on importing diesel fuel, by significantly reducing carbon emissions and making the cost of energy more affordable.
Through a collaborating effort led by MBIE and EECA, New Zealand's energy security approach for rural areas has experienced a major change. This upcoming solar farm in Hooper's Bay is the first phase of construction going forward later this year. Once completed, this farm will produce approximately 2.8 GWh (or enough electricity to satisfy 65% of the current electricity requirements) in a single year, as well as 3.5 MWh of utility-scale battery storage capacity to store any excess solar power produced during daylight hours, to be used during high-demand periods. Thus, this island will be able to run solely on renewable energy from the solar farm and battery storage, without having to rely on diesel generator-based energy generation systems.
Simon Watts, New Zealand's Minister of Energy, said during a press conference in Invercargill via Zoom that "this is a game changer for Stewart Island, and an important example for every remote community across New Zealand". "For many years now these communities have relied on costly, dirty diesel fuel which is transported by barge over dangerous water. By retiring our diesel supply, we are providing cheaper, cleaner and more reliable power, while also bolstering our commitment to generate 100% of our electricity from renewable sources by 2030."
Stewart Island/Rakiura lies approximately 30km south of the South Island and faces serious energy issues. The existing electricity grid is supplied by a fleet of diesel generators, which are owned and maintained by the local electricity network operator. Diesel fuel is supplied irregularly by coastal freighters, and has been subject to ship delays due to ocean conditions, as well as increasing global diesel fuel costs. As a result, residents have been forced to pay very high electricity prices, which are often 2 to 3 times higher than on the main land, and have been without power when the diesel has not arrived on time. It is estimated that by implementing the new solar and battery renewable energy system, the island will reduce its diesel consumption by over 400,000 litres per year, resulting in a reduction of approximately 1,100 tonnes of carbon dioxide emissions every year, which is similar to having 240 cars off the road.
The community leaders in the area have praised the project as a lifeline to Shelford. According to Aria Rangi, the Chairperson of the Stewart Island Community Trust, "We have always looked at ourselves as guardians of one of the world's most untouched environments, but until now, our energy came from one of the dirtiest sources of energy." Rangi continued by saying, "Tourists come to see kiwi bird and dark sky, not to breathe diesel. With this project, we will provide an energy supply that is consistent with our values. We can power our homes, our school, and our businesses without compromising on the environment that defines who we are as people."
To account for the conditions of the island, which include a harsh sub-Antarctic climate (high winds, saltwater, and a high occurrence of storms), local engineers have developed a technical design for the Solar PV system that incorporates these factors. The panels will be installed on a ballasted mount system that is designed to endure wind gusts of 150 km/h or greater, and battery units will be located in weatherproof containers with enhanced protection against corrosion. The Government has also allocated NZ$4.5 million for upgrades to the electrical grid, which includes smart inverter systems along with microgrid control systems that will allow the Electrical Grid to seamlessly transition between the supply of power from solar energy, to the energy supplied from battery storage, and to the backup energy generated from diesel fueled generators as necessary.
Environmental groups have praised the move while calling for further ambition. "This is an excellent step, but we need to see a nationwide strategy to diesel-free all off-grid communities, from Great Barrier Island to the Chatham Islands," said Elena Vickers, energy campaigner at Greenpeace Aotearoa. "Every litre of diesel burned in these communities is a choice, not a necessity, anymore. The technology is ready, and the economics are increasingly compelling."
The Stewart Island project is part of a broader NZ$80 million government initiative launched last year to decarbonize remote and rural energy systems. Similar solar-battery installations are currently under feasibility study for the Chatham Islands and the Bay of Plenty's Motiti Island. Officials say lessons learned from Stewart Island - including logistics of transporting materials across open water and integrating renewables into weak grids - will directly inform those future deployments.
For Stewart Island businesses, the transition cannot come soon enough. Local hoteliers, fishing charters, and kiwi-tour operators have long factored diesel-driven power costs into their pricing. With renewables, they hope to reinvest savings into conservation and guest experiences. "We've been limping along on a 20th-century energy system in a 21st-century world," said hotel owner Bevan Scott. "When the sun goes down, we'll finally have batteries keeping the lights on - without a single drop of diesel. That's not just progress. That's a promise kept to our island and our planet."
Government anticipates overall operation life span for system to be 25 years; diesel bush generator will only be used as backup source during emergencies and when there are extended periods of high rain. Public education program launching this month to help residents maximize their ability to use live power generated on site from solar while also managing demand during times of peak electricity use. Now that request for proposals (RFP) for construction is open, New Zealand has taken another significant step toward demonstrating that clean, reliable energy can come from the farthest reaches of the world.
