The disjunction created by the limited and high cost of available land for onshore renewable energy project development and the increasing efficiency and competitiveness of marine renewable energies (MRE) has generated an accelerated shift in the energy transition to increase the installed capacity in the offshore marine zone. Techno-economic analysis plays a crucial role in supporting the competitiveness of the emerging marine energy sector against the traditional electricity pool. However, the limited experience of commercial MRE deployments and the scarcity of detailed cost data availability often lead to unrepresentative economic models. This paper aims to provide a cost model for different tidal energy converters (TEC) based on the bottom-up approach, and a power assessment based on the available tidal current models.