The U.S. Department Of Energy Hydropower VISION report endorses FDE technolog

Modular and Integrated Components 

​Potential hydropower cost reductions and performance enhancements can be realized through common equipment configurations. …..
Figure ES-10 illustrates an example standardized approach under which a suite of modular components for foundation, generation, and stream passage may be considered and fit together to meet site-specific parameters as well as environmental and power generation objectives.  (Page 19, Executive Summary, Hydropower VISION)