The adoption of electric vehicles in public transport will be essential for the transition of the world's economies toward more sustainable mobility. For this reason, we need an in-depth understanding of the variables that affect the choice of a specific electric technology for public transport: successful implementation of electric transport is highly sensitive to operational context and there could be different types of challenges regarding the electrification of public transport in our cities. This study, by analysing the introduction process of fully electric buses and hybrid vaporetti in the Venice Municipality, contributes to the existing debate on EV adoption. The study explores why and how space can generate path dependency and embeddedness moving from an ICE public transport mobility service toward an electrified mobility service and identifies the specific space attributes that affect the adoption of electric vehicles for public transport. Findings help managers and policymakers in understanding which type of technological innovation, why and how, can support sustainable mobility in each place, while at the same time preserving existing service levels. Interestingly, our findings suggest that space availability in cities can generate barriers of entry for fully electric vehicles, especially for most performing vehicles with higher range.