There has been a strong need to enhance the utilization of renewable energy systems (RESs) from onshore to offshore applications where oil and gas companies are pivoting to integrate such renewable energy options into their offshore operations to lower their carbon footprint, extend the lifetime of their assets, and expand their market. In this regard, innovative hybrid energy systems, such as "Power to Gas" (P2G) and "Power to Liquid" (P2L) options, as well as novel integration strategies for "Gas to Power" (G2P) systems, offer the opportunity to implement solutions energy transition, paving the way to offshore RES deployment. Hybrid Energy Systems for Offshore Applications delivers a comprehensive presentation of state of the art and perspective developments of offshore RES exploitation strategies and technologies, and provides a unique portfolio of decision-making methodologies supporting the selection of the most suitable options for offshore renewable energy production at a specific site. System modeling and analysis along with the definitions of multicriteria methodologies and strategies based on sustainability, environmental impact, and safety performance indicators are addressed in an integrated fashion. Rounding out with both research and practical applications explained, this book gives academicians and industrial professionals fundamentals and methods for integrated performance analysis of innovative systems addressing offshore RES exploitation, sustainable chemical and power production, better efficiency, lower costs, lower environmental impact, and higher inherent safety.