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Abstract In 2021, the Block B12/27 operating area in the Gulf of Thailand encountered a critical reliability crisis as a result of extended DC power outages across multiple wellhead platforms (WHPs) during severe monsoon conditions. Root cause analysis identified systemic vulnerabilities, including inadequate battery autonomy, aging thermoelectric generator (TEG) infrastructure, and the limitations of conventional solar photovoltaic (PV) systems. In response, a multidisciplinary initiative was launched to re-engineer platform power systems through the integration of using excess power of the existing gas booster compressor's alternator, renewable energy technologies solar, wind, and advanced battery energy storage systems (BESS) alongside digital monitoring and predictive maintenance. This manuscript systematically expands on the technical, operational, and economic aspects of the project, tracing the evolution of WHP DC power architectures from legacy TEG configurations to sophisticated hybrid and fully renewable solutions. The document details the methodologies, engineering challenges, and pilot implementations undertaken between 2022 and 2024, highlighting not only the elimination of gas sales shortfalls but also substantial reductions in operational emissions. Key findings include a reduction in GHG emissions as well as a blueprint for scalable, compliant, and economically viable offshore electrification. Through comprehensive data analysis, rigorous adherence to international standards, and robust stakeholder engagement, this work offers actionable insights and a transferable framework for energy professionals, engineers, other offshore operators, and researchers seeking to enhance offshore platform reliability while advancing decarbonization goals worldwide.