MULTI-CRITERIA COMPARISON OF ALTERNATIVES FOR DECOMMISSIONED OFFSHORE PLATFORMS: MILITARY REPURPOSING, RENEWABLES AND COMPLETE REMOVAL

This study compares, using the PROMETHEE II method, three alternatives for decommissioned offshore platforms: complete removal, adaptation to renewable energy, and conversion to semi-autonomous military use. The proposal is not a conclusive feasibility analysis, but an exploratory decision-support simulation based on a literature review and structured according to four criteria: technical suitability, economic performance, environmental performance, and strategic value. In the baseline scenario, military conversion achieved the highest net flow, followed by renewable adaptation and complete removal. Sensitivity analysis preserved this ranking across the evaluated scenarios, indicating stability of the result under the considered weight variations. The results represent relative performance within the adopted model and do not replace specific legal, environmental, financial, and operational studies. The paper contributes by proposing a transparent comparative framework to support discussions on defense, sustainability, and offshore asset reuse.