Price-cap regulation in the English and Welsh water industry: a proposal for measuring productivity performance

Privately owned water utilities typically operate under a regulated monopoly regime. Price-cap regulation has been introduced as a means to enhance efficiency and innovation. The main objective of this paper is to propose a methodology for measuring productivity change across companies and over time when the sample size is limited. An empirical application is developed for the UK water and sewerage companies (WaSCs) for the period 1991-2008. A panel index approach is applied to decompose and derive unit-specific productivity growth as a function of the productivity growth achieved by benchmark firms, and the catch-up to the benchmark firm achieved by less productive firms. The results indicated that significant gains in productivity occurred after 2000, when the regulator set tighter reviews. However, the average WaSC still must improve towards the benchmarking firm by 2.69% over a period of five years to achieve comparable performance. This study is relevant to regulators who are interested in developing comparative performance measurement when the number of water companies that can be evaluated is limited. Moreover, setting an appropriate X factor is essential to improve the efficiency of water companies and this study helps to achieve this challenge.

[1]  Robert J. Hill,et al.  Constructing Price Indexes across Space and Time: The Case of the European Union , 2004 .

[2]  Alexandros Maziotis,et al.  Regulatory Price Performance, Excess Cost Indexes and Profitability: How Effective is Price Cap Regulation in the Water Industry? , 2009 .

[3]  W G Waters,et al.  COMPARING TOTAL FACTOR PRODUCTIVITY AND PRICE PERFORMANCE. CONCEPTS AND APPLICATION TO CANADIAN RAILWAYS , 1999 .

[5]  Martin Cave,et al.  Regulation and Efficiency Incentives: Evidence from the England and Wales Water and Sewerage Industry , 2007 .

[6]  E. Lynk,et al.  Privatisation, joint production and the comparative efficiencies of private and public ownership: the UK water industry case , 1993 .

[7]  R. Tiong,et al.  Tariff adjustment frameworks for privately financed infrastructure projects , 2003 .

[8]  David S. Saal,et al.  Determining the contribution of technical change, efficiency change and scale change to productivity growth in the privatized English and Welsh water and sewerage industry: 1985–2000 , 2007 .

[9]  Profitability and productivity changes in the Korean electricity industry , 2013 .

[10]  Bettina Campedelli,et al.  Economies of Scale, Scope, and Density in the Italian Water Sector: A Two-Stage Data Envelopment Analysis Approach , 2013, Water Resources Management.

[11]  T. Coelli,et al.  Performance measurement in the Australian water supply industry: A preliminary analysis , 2005 .

[12]  Rui Cunha Marques,et al.  Comparing private and public performance of Portuguese water services , 2008 .

[13]  N. Costantino,et al.  A real options-based model to supporting risk allocation in price cap regulation approach for public utilities , 2011 .

[14]  C. O'Donnell.  Measuring and Decomposing Agricultural Productivity and Profitability Change , 2010 .

[15]  Paolo Pierani.  Multilateral comparison of total factor productivity and convergence in Italian agriculture (1951-2002) , 2009 .

[16]  F. González‐Gómez,et al.  Outsourcing and Efficiency in the Management of Rural Water Services , 2013, Water Resources Management.

[17]  David S. Saal,et al.  Profit, Productivity and Price Performance Changes in the English and Welsh Water and Sewerage Companies , 2012 .

[18]  Emmanuel Thanassoulis,et al.  Profit, productivity and price performance changes in the water and sewerage industry: an empirical application for England and Wales , 2014, Clean Technologies and Environmental Policy.

[19]  Pedro Simões,et al.  Performance Benchmarking in Utility Regulation: the Worldwide Experience , 2011 .

[20]  M. Molinos-Senante,et al.  Accounting for service quality to customers in the efficiency of water companies: evidence from England and Wales , 2016 .

[21]  Lester C. Hunt,et al.  Privatisation and Efficiency in the UK Water Industry: An Empirical Analysis , 2009 .

[22]  Kevin J. Fox,et al.  Property Rights in a Fishery: Regulatory Change and Firm Performance , 2003 .

[23]  J. Salerian.  Analysing the Performance of Firms Using a Decomposable Ideal Index Number to Link Profit, Prices and Productivity , 2003 .

[24]  María Molinos-Senante,et al.  Tariffs and efficient performance by water suppliers: an empirical approach , 2012 .

[25]  A. Ros,et al.  X-factor updating and total factor productivity growth: the case of peruvian telecommunications, 1996–2003 , 2006 .

[26]  David Parker,et al.  The impact of privatization and regulation on the water and sewerage industry in England and Wales: a translog cost function model , 2000 .

[27]  Scott Reid,et al.  Estimating OPEX productivity growth in English and Welsh water and sewerage companies:1992-2003 , 2004 .

[28]  Kevin J. Fox,et al.  The contributions of productivity, price changes and firm size to profitability , 2006 .

[29]  Emmanuel Thanassoulis,et al.  Productivity change in the water industry in England and Wales: application of the meta-Malmquist index , 2011, J. Oper. Res. Soc..

[30]  Alexandros Maziotis,et al.  The Luenberger productivity indicator in the water industry: An empirical analysis for England and Wales , 2014 .

[31]  Maurizio Conti,et al.  Scale economies, technology and technical change in the water industry: Evidence from the English water only sector , 2009 .

[32]  John K. Ashton.  Cost efficiency in the UK water and sewerage industry , 2000 .