This Feasibility Study Report for the state of Tamil Nadu is a key milestone for the FOWIND project’s final year of work and is the consecutive step following the Tamil Nadu Prefeasibility Study delivered in 2015. This report is supported by FOWIND’s Supply Chain, Port Infrastructure and Logistics Study and the Grid Integration Study delivered in 2016 and 2017 respectively. The objective of this report is to provide a concept design for a demonstration project of 150 to 504 MW in Tamil Nadu’s most promising offshore wind development area, “zone A” identified in the Prefeasibility Study. This provides companies and government institutions with a starting point for future detailed offshore Front End Engineering Design (FEED) studies and assists with the identification of key project risks in Tamil Nadu.