There are a few dashboards around. I saw someone shared their own personal (next level!) grafana dashboard.
- Transpower offers a Live system and market data view: https://www.transpower.co.nz/system-operator/live-system-and-market-data
- Transpower offers EM6 Live: https://app.em6.co.nz/
- The Electricity Authority (EA) has: https://www.emi.ea.govt.nz/
- EA also offers historical datasets: https://www.emi.ea.govt.nz/Retail/Datasets
The open data situation for electricity information in New Zealand is "pretty good". The main problem is that people in charge see commercial value in up-to-date cost and usage information so the "free data" is delayed. This prevents people from using near real-time data to improve efficiency of their own power systems.
This paywall exists because of the belief that profit is more important than climate action.
