Recent years have seen a sharp rise in Kolkata's motor vehicle fleet, which has increased energy consumption and transportation-related pollution. Adoption of environment-friendly energy-efficient technologies like Electric Vehicles (EVs) is urgently required in the city. EVs are a practical and workable technology that could reduce fuel use and pollution. EV is a suitable option for both public and private transport. However, like other new technologies, EVs require the encouragement and assistance of multiple drivers. However, the drivers are different for public and private modes of transport. Within private modes, drivers are different in the HIG, MIG and LIG categories of people. The study aims to investigate the various elements that contribute to the quicker adoption of EVs in Kolkata's public and private transportation systems. A survey of two hundred stakeholders from ten relevant entities is carried out. The technique of Principal Component Analysis (PCA) is employed to ascertain the key components and their contributing drivers for faster EV adoption in public and private modes. The research results show that: (i) establishing an EV accelerator cell and coordinating with stakeholders; (ii) developing a smart EV infrastructure facility; (iii) innovating in technology; (iv) raising awareness of environmental issues and building awareness; (v) consumer support centres; and (vi) financial instruments are main contributing drivers to promote EVs in public and private transport.