The World Bank's Water and Sanitation Program (WSP) examined eight water utility PPPs.
These PPPs varied in contract type (e.g., concession, lease, management, build-operate-transfer for bulk water supply), procurement pathway (solicited vs. unsolicited), and legal basis.
They also ranged in size, from 700 connections in municipal areas to over a million connections in one of the Metro Manila concessions. Despite these differences, all eight utilities found a way to remain viable while meeting performance standards.
You can view the case studies here.
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