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This is the final version. Available on open access from MDPI via the DOI in this record. ; Operation and maintenance constitute a substantial share of the lifecycle expenditures of an offshore renewable energy farm. A noteworthy number of methods and techniques have been developed to provide decision-making support in strategic planning and asset management. Condition monitoring instrumentation is commonly used, especially in offshore wind farms, due to the benefits it provides in terms of fault identification and performance evaluation and improvement. Incorporating technology advancements, a shift towards automation and digitalisation is taking place in the offshore maintenance sector. This paper reviews the existing literature and novel approaches in the operation and maintenance planning and the condition monitoring of offshore renewable energy farms, with an emphasis on the offshore wind sector, discussing their benefits and limitations. The state-of-the-art in industrial condition-based maintenance is reviewed, together with deterioration models and fault diagnosis and prognosis techniques. Future scenarios in robotics, artificial intelligence and data processing are investigated. The application challenges of these strategies and Industry 4.0 concepts in the offshore renewables sector are scrutinised, together with the potential implications of early-stage project integration. The identified technologies are ranked against a series of indicators, providing a reference for a range of industry stakeholders. ; Engineering and Physical Sciences Research Council (EPSRC) ; European Union Horizon 2020

This is the author accepted manuscript. The final version is available from Elsevier via the DOI in this record ; This paper uses a fully nonlinear model to comprehensively explore the coupled effects caused by the system integration between an offshore wind turbine and a heaving buoy wave energy converter. Parameters of the study include the pitch motion of wind turbine, the tension on the mooring line, the contact pressure between these two devices, and the energy absorbed by power take-off (PTO) system. Results demonstrated that the buoy stabilises/reduces the pitch motion of wind turbine when its metacentric height is positive. A buoy with a negative metacentric height will increase the pitch amplitude of wind turbine and the tension of the mooring line, which is undesirable. The relative vertical motion between heaving buoy and spar could buffer their maximum contact pressure. The Coulomb PTO could offer a higher peak output power of WEC than the linear PTO. The relationship between contact pressure and WEC peak power is quantified to inform the PTO design. The wind/wave device is evaluated at a representative site with suitable wind and wave conditions off the US West Coast. The WEC does significantly reduce the wind turbine pitch motion by at least 60%/50% for the modelled average/max wave conditions with increased power production (14%/80%). ; Engineering and Physical Sciences Research Council (EPSRC) ; European Union Horizon 2020