The Impact of Ownership Unbundling on Cost Efficiency: Empirical Evidence from the New Zealand Electricity Distribution Sector
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.
|Date of creation:||10 Feb 2013|
|Date of revision:|
|Contact details of provider:|| Postal: Vogelsanger Str. 321, Alte Wagenfabrik, 50827 Köln|
Phone: ++ 49 (0) 221 277 29 100
Fax: ++ 49 (0) 221 277 29 400
Web page: http://www.ewi.uni-koeln.de/
More information through EDIRC
Please report citation or reference errors to , or , if you are the registered author of the cited work, log in to your RePEc Author Service profile, click on "citations" and make appropriate adjustments.:
- Greene, William, 2005. "Reconsidering heterogeneity in panel data estimators of the stochastic frontier model," Journal of Econometrics, Elsevier, vol. 126(2), pages 269-303, June.
- Kumbhakar, Subal C & Ghosh, Soumendra & McGuckin, J Thomas, 1991. "A Generalized Production Frontier Approach for Estimating Determinants of Inefficiency in U.S. Dairy Farms," Journal of Business & Economic Statistics, American Statistical Association, vol. 9(3), pages 279-86, July.
- Federico Belotti & Silvio Daidone & Giuseppe Ilardi & Vincenzo Atella, 2013.
"Stochastic frontier analysis using Stata,"
StataCorp LP, vol. 13(4), pages 718-758, December.
- Jondrow, James & Knox Lovell, C. A. & Materov, Ivan S. & Schmidt, Peter, 1982. "On the estimation of technical inefficiency in the stochastic frontier production function model," Journal of Econometrics, Elsevier, vol. 19(2-3), pages 233-238, August.
- Chambers,Robert G., 1988. "Applied Production Analysis," Cambridge Books, Cambridge University Press, number 9780521314275, December.
- William Greene, 2002.
"Fixed and Random Effects in Stochastic Frontier Models,"
02-16, New York University, Leonard N. Stern School of Business, Department of Economics.
- Willam Greene, 2005. "Fixed and Random Effects in Stochastic Frontier Models," Journal of Productivity Analysis, Springer, vol. 23(1), pages 7-32, 01.
- Farsi, Mehdi & Filippini, Massimo, 2009.
"An analysis of cost efficiency in Swiss multi-utilities,"
Elsevier, vol. 31(2), pages 306-315, March.
- Mehdi Farsi & Massimo Filippini, 2008. "An Analysis of Cost-Efficiency in Swiss Multi-utilities," CEPE Working paper series 08-60, CEPE Center for Energy Policy and Economics, ETH Zurich.
- Pollitt, Michael, 2008.
"The arguments for and against ownership unbundling of energy transmission networks,"
Elsevier, vol. 36(2), pages 704-713, February.
- Pollitt, M., 2007. "The arguments for and against ownership unbundling of energy transmission networks," Cambridge Working Papers in Economics 0737, Faculty of Economics, University of Cambridge.
- Battese, G E & Coelli, T J, 1995. "A Model for Technical Inefficiency Effects in a Stochastic Frontier Production Function for Panel Data," Empirical Economics, Springer, vol. 20(2), pages 325-32.
- Hung-Jen Wang, 2002.
"Heteroscedasticity and Non-Monotonic Efficiency Effects of a Stochastic Frontier Model,"
Journal of Productivity Analysis,
Springer, vol. 18(3), pages 241-253, November.
- Wang, Hung-Jen, 2002. "Heteroscedasticity and non-monotonic efficiency effects of a stochastic frontier model," MPRA Paper 31076, University Library of Munich, Germany.
- Caves, Douglas W & Christensen, Laurits R & Swanson, Joseph A, 1981. "Productivity Growth, Scale Economies, and Capacity Utilization in U.S. Railroads, 1955-74," American Economic Review, American Economic Association, vol. 71(5), pages 994-1002, December.
- Fetz, Aurelio & Filippini, Massimo, 2010. "Economies of vertical integration in the Swiss electricity sector," Energy Economics, Elsevier, vol. 32(6), pages 1325-1330, November.
- Yanrui Wu & Xunpeng Shi & Fukunari Kimura & Yu Sheng & Youngho Chang & Yanfei Li & Sun Xuegong & Guo Liyan & Zeng Zheng & Daisy Shen & Qing Yang & Kongchheng Poch & Savong Tuy & Sekar Utami Setiastuti, . "Energy Market Integration in East Asia: Theories, Electricity Sector and Subsidies," Books, Economic Research Institute for ASEAN and East Asia (ERIA), number 2011-rpr-17 edited by Yanrui Wu & Xunpeng Shi & Fukunari Kimura.
- Paul Nillesen & Michael Pollitt, 2011.
"Ownership Unbundling in Electricity Distribution: Empirical Evidence from New Zealand,"
Review of Industrial Organization,
Springer;The Industrial Organization Society, vol. 38(1), pages 61-93, January.
- Nillesen, P. & Pollitt, M.G., 2008. "Ownership unbundling in electricity distribution: empircal evidence from New Zealand," Cambridge Working Papers in Economics 0836, Faculty of Economics, University of Cambridge.
- 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.
- Zhu, Xueqin & Karagiannis, Giannis & Oude Lansink, Alfons G.J.M., 2008. "Analyzing the impact of direct subsidies on the performance of the Greek Olive Farms with a non-monotonic efficiency effects model," 2008 International Congress, August 26-29, 2008, Ghent, Belgium 43612, European Association of Agricultural Economists.
- Xueqin Zhu & Giannis Karagiannis & Alfons Oude Lansink, 2011. "The Impact of Direct Income Transfers of CAP on Greek Olive Farms’ Performance: Using a Non‐Monotonic Inefficiency Effects Model," Journal of Agricultural Economics, Wiley Blackwell, vol. 62(3), pages 630-638, 09.
- Leland Gerson Neuberg, 1977. "Two Issues in the Municipal Ownership of Electric Power Distribution," Bell Journal of Economics, The RAND Corporation, vol. 8(1), pages 303-323, Spring.
- Geoff Bertram & Dan Twaddle, 2005. "Price-Cost Margins and Profit Rates in New Zealand Electricity Distribution Networks Since 1994: the Cost of Light Handed Regulation," Journal of Regulatory Economics, Springer, vol. 27(3), pages 281-308, 01.
- Ramos-Real, Francisco Javier, 2005. "Cost functions and the electric utility industry. A contribution to the debate on deregulation," Energy Policy, Elsevier, vol. 33(1), pages 69-87, January.
When requesting a correction, please mention this item's handle: RePEc:ris:ewikln:2013_006. See general information about how to correct material in RePEc.
For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: (Sabine Williams)
If references are entirely missing, you can add them using this form.