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Optimal water tariffs and supply augmentation for cost-of-service regulated water utilities

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  • Grafton, R. Quentin
  • Chu, Long
  • Kompas, Tom

Abstract

We describe how a common method for regulating water utilities, cost-of-service regulation, can both in theory and practice result in the premature and economically inefficient water supply augmentation. Using a dynamic model calibrated to demand and supply conditions in Sydney, Australia we show how to optimally determine the time to supply augment using a ‘golden rule’ that minimises the average volumetric price paid by consumers. Our results show that, the greater the water scarcity and the longer the operational life of the additional supply, the sooner is the optimal time to augment. Based on our findings, we recommend that price regulators of water utilities adopt an historical cost less depreciation basis for a regulated asset base and a fully flexible and dynamically efficient volumetric pricing that accounts for the marginal opportunity cost of water supplies.

Suggested Citation

  • Grafton, R. Quentin & Chu, Long & Kompas, Tom, 2015. "Optimal water tariffs and supply augmentation for cost-of-service regulated water utilities," Utilities Policy, Elsevier, vol. 34(C), pages 54-62.
    • Handle: RePEc:eee:juipol:v:34:y:2015:i:c:p:54-62
    DOI: 10.1016/j.jup.2015.02.003
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    Cited by:

    1. Bako Kinga-Erzsebet & Fulop Arpad-Zoltan, 2017. "Profitability And Efficiency Analysis In Water And Sewerage Sector In Romania," Annals - Economy Series, Constantin Brancusi University, Faculty of Economics, vol. 4, pages 96-102, August.
    2. Long Chu & R. Quentin Grafton, 2019. "Policy Note: "Short-term Pain for Long-term Gain: Urban Water Pricing and the Risk-adjusted User Cost"," Water Economics and Policy (WEP), World Scientific Publishing Co. Pte. Ltd., vol. 5(02), pages 1-14, April.
    3. R. Quentin Grafton, 2017. "Responding to the ‘Wicked Problem’ of Water Insecurity," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 31(10), pages 3023-3041, August.
    4. Delgado, A. & Rodriguez, D.J. & Amadei, C.A. & Makino, M., 2024. "Water in Circular Economy and Resilience (WICER) Framework," Utilities Policy, Elsevier, vol. 87(C).
    5. Grafton, Rupert Quentin, 2019. "Policy review of water reform in the Murray– Darling Basin, Australia: the “do’s” and “do’nots”," Australian Journal of Agricultural and Resource Economics, Australian Agricultural and Resource Economics Society, vol. 63(01), January.
    6. Rust, Steven & Silberberg, Ben & Turner, Emma & Sharp, Basil, 2020. "Investigating the value of keeping options open for water infrastructure in the Lower Hunter, New South Wales," Utilities Policy, Elsevier, vol. 62(C).
    7. Cooper, Bethany & Crase, Lin, 2016. "Governing water service provision: Lessons from Australia," Utilities Policy, Elsevier, vol. 43(PA), pages 42-47.
    8. Molinos-Senante, María & Donoso, Guillermo, 2016. "Water scarcity and affordability in urban water pricing: A case study of Chile," Utilities Policy, Elsevier, vol. 43(PA), pages 107-116.
    9. Garrone, Paola & Grilli, Luca & Marzano, Riccardo, 2019. "Price elasticity of water demand considering scarcity and attitudes," Utilities Policy, Elsevier, vol. 59(C), pages 1-1.

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