Rt Hon JACINDA ARDERN: The best option is a supply that actually doesn't have to have an impact on our environment and does allow us to keep the lights on. It is within New Zealand's power to have 100 percent renewable electricity generation. It will require investment, but that is why we are making the decisions we are now. At the same time, we have to ensure security of supply. What happened last night was that the generation that was available was not brought on, so that did not have to happen with the current mix that we have. 