This study was conducted by the NCAER team during 2020-21 to estimate the impact of the proposed refinery at Ratnagiri district of Maharashtra. This study reports on the extensive estimation of the benefits of the Ratnagiri Refinery & Petrochemicals Limited (RRPCL) investment in terms of overall output, incomes, employment and tax contributions during both the construction and the operational phases of the project starting from 2021 onwards. These are estimated at the national level. The study also brings out these economic benefits for the State of Maharashtra. It further discusses the impact of the RRPCL investment on economic conditions in the relatively backward districts in the western coastal region of Maharashtra. This covers the impact on economic opportunities, mobility, and the employment of the local population during both the construction and operational phases of the project