At various points in its existence, the Indian state has deployed technologies to govern the nation. Recently, the state has undertaken a number of large-scale projects to make use of digital technology. The most controversial of these is the Unique Identity (UID) project, which is registering biometric, along with demographic, information about residents. This paper seeks to understand what is at stake politically in this technological intervention. It aims to explore the political logics and consequences of such a biometric system. It argues that UID re-imagines the economy and state–citizen relationship as a series of transactions. Theoretically, the main thrust of this paper is to understand the “general economy of power”, as Michel Foucault calls it, which is unfolding in India around the issues of capitalist growth, inequality, social protection and terrorism—and UID signals the technological potential for the convergence of these concerns