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This paper presents both steady-state and dynamic analyzed results of a hybrid offshore wind and tidal farm connected to an onshore power grid using a flywheel energy storage system (FESS). The performance of the studied offshore wind farm (OWF) is simulated by an equivalent aggregated 80-MW doubly-fed induction generator (DFIG) while the operating characteristics of the studied tidal farm (TF) are simulated by an equivalent aggregated 40-MW permanent-magnet generator (PMG). Both frequency-domain approach based on a linearized system model using eigenvalue analysis and time-domain scheme based on a nonlinear system model subject to a wind-speed disturbance condition are carried out. It can be concluded from the simulated results that the proposed FESS can effectively stabilize the studied hybrid OWF and TF under various conditions.