This review critically examines HRES configurations for islands (solar–wind, solar–marine current, and wind–wave), assessing how they match local resources, system needs, and constraints. Small- and medium-sized islands struggle to secure reliable, affordable, low-carbon electricity due to their isolation, scarce land, and reliance on imported fossil fuels. Hybrid renewable energy systems (HRESs) offer a way forward, but research has focused overwhelmingly on solar–wind. This study aims to demonstrate the feasibility of implementing HRES on islands, based on energy optimisation. The most. Hybrid renewable microgrids integrate multiple energy sources to create a robust and flexible power system. By combining different renewable. HVDC4ISLANDS aims to identify relevant energy island configurations based on HVDC and hybrid DC/AC networks and then to develop tools for their advanced operation, reconfiguration and expandability while ensuring system wide stability, protection, and interoperability.
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