The implementation of unmanned surface vehicles is rising due to technical advances and novel condition monitoring systems to improve seabed exploration. The objective of this paper is to evaluate the economic viability of the USV developed during the ENDURUNS project. The main novelty lies in the evaluation of the viability of novel marine vehicles powered by renewable energy, being a topic not detected in the existing literature. This paper presents a cost analysis of unmanned surface vehicles powered by renewable energy sources developed under the European ENDURUNS and MERLIN projects. The study follows the UNE-EN-60300 standard to assess the life cycle cost, taking into account key expenses and revenues over 10 years. The viability evaluation of the submarine vehicles is performed through Life Cycle Cost analysis simulating two financial scenarios. The study also examines the impact of the discount rate on Net Present Value in comparison to conventional unmanned surface vehicles. The results confirm the economic feasibility of the ENDURUNS and MERLIN vehicle due to the modular design and renewable energy sources. The novel design of the USV developed by the ENDURUNS and MERLIN projects together with the eco-friendly nature of the project adds complexity to the economic analysis compared to other studies. The incorporation of investment costs along with other LCC and the impact of critical parameters such as inflation, to enhance the reliability of the results, is also a novelty in the current state of the art.