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EM Driven Underwater Power Generation Plants present a new architectural approach to tidal and current based energy generation. Rather than introducing new physics, EM UPGPs apply proven direct drive electromagnetic generation within a modular subsea plant structure designed to eliminate the dominant mechanical and operational burdens of traditional tidal turbines and offshore wind systems. Each plant integrates a slow turning hydrodynamic rotor, a sealed electromagnetic generator, and autonomous control systems into a single replaceable pod that can be installed, recovered, or swapped using standard ROV operations. The EM UPGP architecture replaces pitch systems, yaw drives, gearboxes, and tower structures with governed electromagnetic loading and distributed electronic control. This enables millisecond scale response to grid conditions, reduces maintenance requirements, and removes the need for heavy lift vessels or weather dependent surface access. When deployed in arrays, EM UPGPs operate as intelligent, cooperative nodes capable of balancing load, isolating faults, and maintaining stable output even when individual units are offline. This document defines the baseline EM UPGP design, introduces an optional superconducting variant for high capacity applications, and provides detailed analysis of system performance, installation methods, environmental considerations, and comparative economics. A reference two megawatt unit is used to establish realistic mass, power, and cost parameters. The analysis demonstrates that EM UPGPs can achieve energy conversion efficiency comparable to modern tidal turbines while offering significantly lower operational expenditure and a credible pathway to sub fifty dollars per megawatt hour levelised cost of energy. The architecture provides a practical, scalable, and grid compatible foundation for next generation underwater power generation.