2009-04: Modelling price and volatility inter-relationships in the Australian wholesale spot electricity markets (Working paper)

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Higgs, Helen
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Nguyen, Tom

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2009
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22 pages

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Abstract

This paper examines the inter-relationships of wholesale spot electricity prices among the four regional electricity markets in the Australian National Electricity Market (NEM) -- namely, New South Wales, Queensland, South Australia and Victoria -- using the constant conditional correlation and Tse and Tsui's (2002) and Engle's (2002) dynamic conditional correlation multivariate GARCH models. Tse and Tsui's (2002) dynamic conditional correlation multivariate GARCH model, which takes account of the Student t specification, produces the best results. At the univariate GARCH(1,1) level, the mean equations indicate the presence of positive own mean spillovers in all four markets and little evidence of mean spillovers from the other lagged markets. In the dynamic conditional correlation equation, the highest conditional correlations are evident between the well-connected markets indicating the presence of strong interdependence between these markets, with weaker interdependence between the not-so-well-interconnected markets.

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Copyright © 2010 by author(s). No part of this paper may be reproduced in any form, or stored in a retrieval system, without prior permission of the author(s).

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Economics and Business Statistics

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C51 - Model Construction and Estimation

L94 - Electric Utilities

C32 - Multiple or Simultaneous Equation Models: Time-Series Models; Dynamic Quantile Regressions; Dynamic Treatment Effect Models

Q40 - Energy: General

Wholesale spot electricity price markets

Constant and dynamic conditional correlation

Multivariate GARCH

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