The AARC project presents a poster/lightning talk to encourage collaboration of Federations and NRENs with Libraries. It builds on the Library Toolkit and three pilot developed in the AARC project to support and enhance the experience of libraries and library users when using SSO. Libraries have a tradition providing access to their online resources via IP-based authentication. Publishers are increasingly mandating the use of SSO. This poster/lightning talk aims to highlight the benefits of SSO for libraries and to encourage collaboration between Federations/NRENs and libraries/library consortia.