Chennai, Oct 23 (UNI) Bringing sustainable energy solutions to underserved tribal communities, C.K.College of Engineering and Technology (CKCET), a unit of CK Group of Educational Institutions, and the Sustainable Development Council (SDC) launched Project Ray: Sustainable Streetlight Mission (SSM) at a tribal hamet at Udhagamangalam in the hilly Nilgiris distrct of Tamil Nadu.