Simshauser and Whish-Wilson (2017) examined the restructured Victorian retail electricity market and found it to be efficient as the marginal unit produced was sold at marginal cost. This article extends their analysis of price dispersion by considering the heterogeneous nature of electricity consumption when measured by volume sold (kWh). We find that customers on 'standing offer' tariffs use 18% less electricity than customers on 'high discount' products, indicating the presence of market segmentation and implicit second-degree price discrimination. Climate change policy and the emergence of new technologies such as household solar PV, battery storage and home energy management systems will create further price dispersion in Australian electricity markets due to even greater product heterogeneity. We contend that policy makers will need to facilitate, rather than prevent, both price and tariff structure dispersion with the objective of improving consumer outcomes.
The electricity supply industry has historically offered a homogenous good supplied via economically regulated transmission and distribution networks. Competition was introduced into the contestable generation and retail supply chain components as part of the 1990s Hilmer reform process. After a century of incremental technological developments, the industry is now being transformed by new distributed energy technologies and a global focus on reducing anthropogenic greenhouse gas emissions. Policy-makers did not anticipate these changes. A number of key reforms are likely to be required. These include: assessing whether the return on capital provided to network operators is appropriate given changing economic conditions; determining the role of competition in the provision of "behind the meter" energy services; and integration of climate change policy with wholesale energy market design.
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