<p>This study presents a coupled aero-hydrodynamic analysis of a 5MW SPAR floating offshore wind turbine (FOWT) under site-specific wind and wave conditions representative of the Gujarat offshore region for the first time. Using 25 years of seasonal mean metocean data from ERA5 dataset, platform motions, mooring line tensions and power generation are evaluated for wave headings between 0° and 30° under steady wind conditions. The performance of taut and conventional slack mooring arrangements is compared to assess the suitability of SPAR FOWTs for deepwater deployment off the Gujarat coast. Furthermore, a preliminary offshore wind farm layout is proposed based on the aero-hydrodynamic response characteristics and power generation results derived from the analyzed SPAR FOWT. A reduction of approximately 60% in surge and 6% in pitch is observed with the taut mooring arrangement across all load cases and wave headings. However, heave motions are slightly amplified due to the increased stiffness of the taut lines. The effect of wind–wave misalignment is minimal, likely owing to the SPAR’s symmetrical geometry and the limited variation in wave headings. Overall power generation is observed to be aligned with the load cases and less affected by the mooring arrangements. Using a simplified capacity-factor-based method with unidirectional wind and wake effects represented through turbine spacing and incorporating floater-turbine dynamics, the estimated annual energy production is approximately 16,585 MWh per turbine. However, the actual AEP is expected to decrease by approximately 10–12% after accounting for actual wake and electrical losses. Thus, these findings provide preliminary insights for stakeholders and policymakers to support informed decision-making and prioritization of floating offshore wind turbine deployment under Indian offshore conditions.</p>