An offshore renewable energy-powered standalone platform is an integrated marine carbon capture system that employs a floating deployment architecture and utilizes a closed-loop water circulation system to achieve efficient carbon capture from seawater and ecological neutralization. This system integrates carbon capture technologies such as post-combustion capture, which separates CO₂ from exhaust gases using separation towers and scrubbers, and recycles waste heat for energy efficiency. By leveraging renewable energy sources like solar, wind, and ocean thermal energy, the platform enables large-scale carbon removal while restoring ocean pH through alkaline neutralization and promoting atmospheric CO₂ absorption via Henry's Law.