It is important to distinguish between various meanings of private sector involvement. The term “privatisation” would refer to the full hand-over of assets. “Private sector participation” reflects the role of the private sector in delivering services when some responsibilities and risks are shifted to the private sector. The term “public-private partnership” (PPP) equally recognises the roles of both public and private sector in service provision highlighting the need for partnership. The various types of private sector involvement in the water supply sector can be classified as following according to the World Bank:
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Divestiture or outright sale: transfer of all public assets through sales, in which case, the private sector obtains full responsibility of the water supply network facilities and operations.
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Build-operate-own (BOO)/build-operate-own-transfer (BOOT): private company has the ownership (until transfer in case of BOOT), private company finances and builds the facility (infrastructure project), private company operates the facility on a concession or operation and maintenance are outsourced to another private company (in case of BOO).
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Concession/build-operate-transfer (BOT): output focused projects with assets remaining in public ownership and the use of the system being transferred to private operators. In concession, based on results, the private operator pays net of fee for use of existing assets. BOT projects are generally greenfield and are used to develop a discrete asset.
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Joint venture: shared ownership between the private and public sector as a result of a contracting authority requiring to have an equity stake in the project or an existing public utility selling a stake in the utility to a private company.
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Lease/affermage: arrangement under which the private operator is responsible for operation and maintenance, as well as for current financing but not for capital financing.
The classification above mainly concerns urban piped water services. Apart from those, there are also small-scale private service providers (SPSPs) who provide water through trucks, jerry cans, bottles, etc. In some parts of Latin America, Africa, and South Asia urban dwellers still rely on these services compensating for or supplementing the limitations of the public sector. They have usually been called “gap fillers” in countries with low-quality water services, “pioneers” as those developing systems in areas where there is no public service and “sub-concessionaires” buying water from the utility and selling it to the customers. SPSPs are found all across the Global South with documented examples in Thailand, Angola, Nigeria, Sudan, Jordan, Uzbekistan, Colombia, and Paraguay (Kariuki and Schwartz, 2005).