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The Impact of Ownership Unbundling on Cost Efficiency: Empirical Evidence from the New Zealand Electricity Distribution Sector

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  • Filippini, Massimo

    ()
    (Energiewirtschaftliches Institut an der Universitaet zu Koeln)

  • Wetzel, Heike

    ()
    (Energiewirtschaftliches Institut an der Universitaet zu Koeln)

Abstract

Several countries around the world have introduced reforms to the electric power sector. One important element of these reforms is the introduction of an unbundling process, i.e., the separation of the competitive activities of supply and production from the monopole activity of transmission and distribution of electricity. There are several forms of unbundling: functional, legal and ownership. New Zealand, for instance, adopted an ownership unbundling in 1998. As discussed in the literature, ownership unbundling produces benefits and costs. One of the benefits may be an improvement in the level of the productive efficiency of the companies due to the use of the inputs in just one activity and a greater level of transparency for the regulator. This paper analyzes the cost efficiency of 28 electricity distribution companies in New Zealand for the period between 1996 and 2011. Using a stochastic frontier panel data model, a total cost function and a variable cost function are estimated in order to evaluate the impact of ownership unbundling on the level of cost efficiency. The results indicate that ownership separation of electricity generation and retail operations from the distribution network has a positive effect on the cost efficiency of distribution companies in New Zealand. The estimated effect of ownership separation suggests a positive average one-off shift of 23 percent in the level of cost efficiency in the shortrun and 15 percent in the long-run.

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Bibliographic Info

Paper provided by Energiewirtschaftliches Institut an der Universitaet zu Koeln in its series EWI Working Papers with number 2013-6.

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Length: 16 pages
Date of creation: 10 Feb 2013
Date of revision:
Handle: RePEc:ris:ewikln:2013_006

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Keywords: Electricity distribution; Ownership separation; Cost efficiency; Total cost function; Variable cost function; Stochastic frontier analysis;

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  1. de Nooij, Michiel & Baarsma, Barbara, 2009. "Divorce comes at a price: An ex ante welfare analysis of ownership unbundling of the distribution and commercial companies in the Dutch energy sector," Energy Policy, Elsevier, vol. 37(12), pages 5449-5458, December.
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  9. Fetz, Aurelio & Filippini, Massimo, 2010. "Economies of vertical integration in the Swiss electricity sector," Energy Economics, Elsevier, vol. 32(6), pages 1325-1330, November.
  10. Federico Belotti & Silvio Daidone & Giuseppe Ilardi & Vincenzo Atella, 2012. "Stochastic frontier analysis using Stata," CEIS Research Paper 251, Tor Vergata University, CEIS, revised 13 Sep 2012.
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