Not NZ but a starting point for you … look for Facebook or other social media for off-grid groups. Folk are doing this right now. EWR

From offgridworld.com

So, you want to know how to live off the grid. It’s simple really. Move to the woods, build a cabin, throw on some solar panels and wind turbine for power, and drill a well. Then start raising chickens, cows, and pigs, and sit on your front porch while sipping coffee and staring out at the beautiful natural wilderness around you. Easy, right? Not really.

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https://offgridworld.com/how-to-live-off-the-grid-8-things-you-need-now/