A modular, electricity generating apparatus comprises an elongate, central member comprising a first end and a second end; at least one solar foil disposed about the central member in fluid interacting relation thereto; the solar foil comprising an outer surface having photovoltaic properties; the first end and the second end dimensioned and configured to be connected to a connecting node; and, the elongate central member at least partially comprised of an electrically conductive material and configured to conduct electricity from at least one of the connecting nodes to the other of the connecting nodes.

A submersible turbine generator unit can be placed in rivers, streams, or anywhere water flows in order to generate electricity without the need for dams. It is designed to work with its own diversion equipment for controlling and directing a flow of water into the turbine blades. The unit can be raised and lowered in the flow to enhance efficiency, respond to changing flow conditions, and for inspection/servicing, etc. The positioning system can use a motorized worm gear and a rack to raise or lower the turbine generator combination. Once raised up, a hard connection point allows attachment of a lifting cable so the turbine/generator combination can be easily removed and replaced as needed. A submersible turbine generator utilizes uniquely shaped turbine blades that efficiently engage flowing water and spin the turbine shaft without presenting undue risk to aquatic life.

A method and associated system repair a damage or a defect in a piece of metallic material. A sensor on a remote operated vehicle (ROV) measures first geometrical data of a plurality of points or areas of the defect or damage. Based on the first geometrical data, excavation data is generated of one or more zones of the defect or damage by selecting or generating one or more predefined shapes or volumes. With the ROV, the piece of metallic material is excavated according to the excavation data to form an excavated zone. With the ROV, the piece of metallic material is repaired by depositing metallic material in the excavated zone.