NOVELTY - The method involves positioning a series of modules across a body of water i.e. river (12), to form a structure (10) perpendicular to direction of current flow (14). Another series of modules is positioned across the body of water to form another structure perpendicular to direction of current flow and spaced apart from the former structure, where each structure is installed across width of the body of water. A third series of modules is positioned across a bed of the body of water to form a third structure perpendicular to direction of tidal or current flow.    USE - Method for installing a series of power generating structures i.e. spectral marine energy converter (SMEC) structures, across a body of water i.e. river, to generate electricity from current flow. Can also be used for body of water such as estuary, fjord and channel.    ADVANTAGE - The method enables providing a series of structures along length of the body of water so as to enable amount of energy to be extracted without environmental consequences upstream and downstream caused by singular damming across a river to obtain equivalent energy. The method enables incorporating locks into SMEC structures to permit passage of shipping and gaps to permit passage of water craft and fish or marine mammals up and down the river. The method enables providing partial obstruction of flow with an artificial island or utilizing closed lock gates, which can function to increase flow rate and guide flow through a SMEC so as to enhance flow velocity and electricity generation. The method enables minimizing edge losses by attaching a surface to a free end of structure extending at right angles upstream of the structure. The method enables directing water through pipes while minimizing flow around an edge. The structures comprise pipes, which have length such that modules extend down to river bed to minimize by-pass flow.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a system for generating electricity comprising a manifold structure.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of structures installed along length of a body of water.    Structure (10)    River (12)    Current flow (14)