NZ's biggest solar farm to be built

[harm_less]

Yes, I've seen large acreages covered in them in Eastern Europe.. viable flat farmland as far as I could tell.  Should not be put on viable flat farmland unless at a suitable height that allows grazing.

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Well that looks great - is that what they plan for here?

Why are we not using our hydro potential to the fullest I wonder?

The usual reason. Just follow the money. State funded hydro dams sold off on the sharemarket so their operation needs to turn a profit for the shareholders. That was a National government move that was great for investors but resulted in a situation that continues to distort the economics of the NZ electricity sector to the detriment of consumers.