Modelling price formation in electricity markets is a notoriously difficult process, due to physical constraints on electricity generation and transmission, and the potential for market power. This difficulty has inspired the recent development of bottom-up agent-based algorithmic learning...

The recent Wolak report on the New Zealand electricity market found evidence of substantial market power. The report, an empirical one, was heavily criticised on several aspects of its methodology. We investigate market power in the New Zealand Electricity Market during 2006 and 2008 using an...