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Coming south one can supercharge in Christchurch, Omarama and Dunedin and Queenstown but stop is Chargenet in Invercargill and no chance to get to Milford Sound. How about TeAnau or Mossburn? Isn't it time the South got full coverage?
If you own a different EV you can sign up for a Tesla account to charge a Non Tesla and I assume that allows you to vote too.
Beyond that contact your local member.