Depending on who you ask and what their specific definition of social enterprise is, they may say that "scalable social enterprises" are redundant because all social enterprises should be able to scale. At the same time, however, that is not always the case and surely that is not always the goal for founder and funders alike.
From energy that works on a pay as you go basis to sustainable laundry services, this SocialBusiness.org top list enumerates a number of scalable social enterprises that pay special attention to how and when they can go to scale. For example, Water Health International (WHI) is an organization that works in Bangladesh, Ghana, India and the Philippines in order to be able to provide investments that allow for potable water sources.
14 Scalable Social Enterprises
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Sustainable Laundry Services
Energy Poverty Entrepreneurs
Social Entrepreneurship Filmmakers