In this paper we develop a new approach to understanding the behavior of high frequency electricity spot prices. It treats electricity delivered at different times of the day as different commodities, while recognizing that these commodities may be traded on a small number of intra-day markets....

We reveal properties of electricity spot prices that cannot be captured by the statistical models, commonly used to model financial asset prices, that are increasingly used to model electricity prices. Using more than eight years of half-hourly spot price data from the New Zealand Electricity...

The major diffculties in assessing market power in electricity wholesale spot markets mean that great weight should be placed upon assessing market outcomes against the fundamental determinants of supply, demand and competition. In this spirit we study whether the New Zealand market has been a...