Socio-Economic and Ecosystems Water
Valuation
Water Reuse in a Cogeneration Power
Plant Kwinana, Australia
Anne Prieur-Vernat, Elsa Favrot
Samuel Vionnet
24 August 2015
World Water Week, Stockholm
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ENGIE
Valuing Nature
Industrial synergies impulsed by the local authorities
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Case study focused on ENGIE Kwinana cogeneration plant
Direct synergies with the BP refinery and KWRP
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Industrial area located in extremely high water stressed area
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Local population ~2 M inhabitants
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Target to recycle 30% of wastewater by 2030
(State water plan 2007 – Western Australia Government)
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Local environmental constraints on water discharge
to preserve the ecosystem of Cockburn Sound
Multiple industrial synergies, including water reuse
Kwinana Water Reclamation Plant (KWRP) produces 17 ML/day
of high quality industrial grade water
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The value of water – Summary
+ 1’670’000 AUD/year benefits
Social and economic shared benefit thanks to water recycling (74% of which
benefit the local community of Perth), linked to ENGIE water use.
- 2’400’000 AUD/year costs savings
Costs savings for Kwinana cogeneration power plant
- 3 % impact/kWh reduction thanks to
water recycling
Overall reduction of 1 kWh environmental externalities, thanks to
water recycling initiative.
AUD: Australian dollar
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Results – Overall benefits
Thanks to the water reclama0on plants, a water saving of 1’239’000 m3 is achieved. The socio-­‐economic benefits are split into the following categories: Reduced pressure on water resources for community use, avoiding the use of desalina0on water in the future. Shared impact (‘1000) ‘1000 AUD / year 980 Maintained ecosystem services from preserved wetlands 434 Protected wetlands Society benefit 250 Community benefit 23/08/15
Reduced environmental due to preserved water resources, using more less pollu0ng sources. World Water Week
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Results – Overall benefits
2’400 ‘1000 AUD / year 980 434 23/08/15
Protected wetlands Society benefit Community benefit 250 World Water Week
ENGIE benefits Shared impact (‘1000) ENGIE BENEFITS (costs savings) The socio-­‐economic benefits is accompanied by a cost-­‐
reduc0on (benefit) for ENGIE. 5
Water valuation: a promising approach
Environmental impacts valuation (including water):
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Supports decision making through Cost Benefit Analysis
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Highlights socio-economic and ecosystems shared value, in addition to private companies value
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Is a relevant approach for the interpretation of environmental impact assessments with a
common and comparable unit
BUT :
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Needs a standardized approach to improve reliability and acceptability of the results
Needs more case studies and success stories to convince the stakeholders, especially the
private sector
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