South Australia participates in Australia's National Energy Market (NEM): https://aemo.com.au/en/energy-systems/electricity/national-e...

The market operator, AEMO, hosts a NEM dashboard here - pretty interesting. The first tab of the dashboard is showing the supply and demand in each australian state that participates in the market. It also shows the flow between the different states via interconnectors, highlighting which interconnectors are at capacity. Some of the other tabs show the electricity price & the fuel mix for each state: https://aemo.com.au/en/energy-systems/electricity/national-e...