Incorrect. All of the hydropower is used as present, so any extra marginal load added to NZ causes extra gas usage (or coal sometimes). If the lakes are full and water is being sent down spillways, then perhaps you can get free power, but that is rare.
Also note that lots of people think transmission losses are heavy, but actually they are less than 10%. For example HVDC transmission losses are ~3% per 1,000km (the DC link from Benmore to Wellington)
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Incorrect. All of the hydropower is used as present, so any extra marginal load added to NZ causes extra gas usage (or coal sometimes). If the lakes are full and water is being sent down spillways, then perhaps you can get free power, but that is rare.
Also note that lots of people think transmission losses are heavy, but actually they are less than 10%. For example HVDC transmission losses are ~3% per 1,000km (the DC link from Benmore to Wellington)