<p>Infrastructure development is a critical driver of inclusive growth and sustainable development, particularly in rural and remote coastal regions. The electrification of Sagar Island in West Bengal, India, implemented under the India Integrated Coastal Zone Management (ICZM) Project during 2011–2015, stands as a notable example of how integrated coastal policy can catalyse socio-economic transformation. The study demonstrates how infrastructure interventions under the ICZM framework contribute not only to socio-economic development but also to coastal conservation by reducing ecological pressure on fragile island ecosystems. The project led to significant improvements across multiple dimensions, enhancing employment opportunities, enabling better access to education and healthcare, and improving overall quality of life. From just 206 domestic electricity consumers in 2011, the number rose dramatically to 55,312 by 2020. Similarly, commercial connections increased from 415 to 4,652 during the same period. Integration into the grid ensured a stable and cleaner power supply, reducing dependence on polluting alternatives. This paper highlights how the electrification initiative directly supports Sustainable Development Goal (SDG) 9 - Industry, Innovation, and Infrastructure while also advancing seven other SDGs. It underscores how a well-integrated coastal policy framework can serve as a powerful tool to achieve multiple sustainable development outcomes through a single, strategically designed project. The findings demonstrate that infrastructure interventions can contribute to coastal sustainability by enhancing resilience, reducing dependency on natural resources, and supporting ecosystem based management.</p>