The ship swung a crane over the side in pieces.
No road leads to the Chatham Islands from anywhere.
Five hundred miles of open ocean separate the archipelago from mainland New Zealand, and almost everything that arrives comes in on a single aging vessel.
That included a crane broken apart so no single piece exceeded what the ship could hoist, then reassembled on a coastal headland to lift tower sections weighing about 23 US tons each.
Was any of it going to be worth it once it got there?
Why the island’s power cost four times what the mainland paid
The Chatham Islands ran almost entirely on Chatham Islands diesel generators, a system exposed to shipping delays and fuel price swings that pushed electricity to more than four times the New Zealand average. Before the wind farm, island power cost about 129.5 New Zealand cents per kilowatt hour, among the highest rates in the country. That system exists to supply roughly 600 residents and the island’s small commercial sector, and the local electricity trust wanted a way to cut its dependence on a single fuel chain.
The 55 bedroom hotel that anchors island tourism carried monthly power bills in the tens of thousands of New Zealand dollars, a cost its owner described as horrendous. Generating island power cost the local electricity company roughly NZ$1.8 million a year, and unpredictable energy costs held back growth.
A pair of 225 kilowatt turbines had been installed years earlier, yet generation was still almost entirely diesel when the new project began. The wind resource had never gone anywhere. The question was whether anyone could get the equipment to it.
Getting a crane to a place no crane had reason to be
The particular challenge was mobilizing a crane with enough lifting capacity that could also be broken down into sections under roughly 35 US tons per piece, so the ship’s gear could hoist each section on and off the vessel. A crane too heavy to reach the site in one lift is simply a crane that does not go. The contractor found one that could be disassembled to fit, then reassembled at Point Durham.
Equipment crossed open maritime routes from Timaru and Napier, and those crossings can close for days. The ground work included 51 precast foundation units, tensioned and grouted into place rather than poured, because there was no bulk concrete supply on the island.
Only then could crews lift the 98 foot tower sections, assemble each nacelle and set the blades. The 35 ton limit was not a preference. It was the physical constraint of what the vessel could hoist, and crane selection flowed entirely from that number.
Three old turbines doing a new kind of work
The completed installation includes three refurbished Vestas V27 turbines rated at 225 kW each at Point Durham, alongside a grid balancing plant at the Sandstone power station. The whole system exists to reduce the island’s fuel bill and give residents steadier, cheaper electricity. A 576 kilowatt hour battery allows the diesel generators to shut down completely when wind covers demand, and can carry about an hour of peak load when wind speeds swing.
The turbines are not new machines, and that was the point. The V27 is an old workhorse design, and refurbished units were far cheaper to buy and ship to a site this remote. They generate in winds from roughly 7 mph up to about 56 mph and can produce more than the island’s peak demand at times.
On a good wind day, the generators go silent entirely.
What the meters showed once everything was running
Since commissioning, the wind farm has logged whole days of 100 percent wind generation with diesel shut down, and an early stretch averaging 90 percent renewable energy across seven consecutive days, according to the trust that owns the island network. Every full day run on wind saves the community around NZ$5,000 in diesel, and annual output is put at about 600,000 kilowatt hours.
The official estimate at the opening was a cut in diesel use of up to 68 percent, worth roughly NZ$1.2 million a year. That is a forecast rather than a measured annual result.
The price story since has been messier. Power had been expected to fall by more than 20 percent to about 89 New Zealand cents per kilowatt hour, but higher world fuel prices pushed the island tariff up about 32 percent instead, to roughly NZ$1.32. The trust said the wind farm held that rise down, and that the islands are not yet fully renewable.
Elsewhere, a Wyoming trial is testing on dozens of turbines whether painting one blade black cuts bird collisions the way a small Norwegian experiment suggested. In south Texas, ultrasonic deterrents cut bat fatalities beneath turbines, with the size of the effect varying by species, as described in the contractor’s own project account.
What the island gets that the numbers do not capture
The Chatham Islands sit in the band of westerlies that once drove sailing ships around Cape Horn, and the resource was never the problem. What was missing was a way to use it without destabilizing a very small grid, and the battery at Sandstone power station is what lets the generators switch off rather than idle.
The hotel owner reported bills down about 20 percent in the first six months of operation, even as the island tariff climbed with fuel costs. Cheaper, steadier power is also what island leaders say could make it viable to process more fish species locally instead of shipping the catch away.
The island now has an unusual combination in remote power: a wind resource that almost never stops and a demand small enough that three refurbished turbines from an earlier era of the industry can cover it on a windy day. The generators still run when the wind drops, and they still supply a large share of the island’s electricity. They are no longer the only plan.
