Where can I find out more information about power of choice?

The Australian Energy Market Operator (AEMO) and the Australian Energy Market Commission (which sets the rules that govern the electricity and natural gas markets) both offer information on ‘Power of Choice’   on their websites:

AEMC – http://www.aemc.gov.au/Major-Pages/Power-of-choice

AEMO – https://www.aemo.com.au/Electricity/National-Electricity-Market-NEM/Power-of-Choice

NSW state government also has information available on Power of Choice:

NSW – https://energysaver.nsw.gov.au/households/understand-your-usage/smart-meters