Patent ID: 7658589

Claim:
An apparatus comprising: a plurality of turbine-generator modules, wherein each module includes: a generator; and a turbine system comprising: a turbine; a tubular arrangement comprising an opening region; the tubular arrangement being connected to a downstream side of the turbine; a flow arrangement that at least partially prevents a fluid flow from becoming detached from the tubular arrangement; and the flow arrangement being positioned within the fluid flow and in an area of the opening region wherein, when no medium is flowing through the turbine system, the turbine system is arranged in an operating position relative to a tailwater level of the fluid flow such that at least approximately 10% of an outlet cross-sectional area of the tubular arrangement is arranged above the tailwater level, and wherein said turbine system is operable in an enviroment in which there is either a low liquid level of the fluid flow or no liquid level at the downstream side of the turbine.