Method for producing a device for obtaining electrical energy from hydropower and a method for modifying a dam, in which, at a remote production site, at least two turbine-generating units, comprising a turbine and a generator connected to it, are produced, at a remote production site at least two turbine-generator units are connected to one another to form at least one module including at least two turbine-generator units. The at least one module is transported from the production site over a distance to the site of use by a transport, and, at the site of use, the at least one module is lifted off the transport by a lifting fixture and is moved into a position which is provided for its operation. The instant abstract is neither intended to define the invention disclosed in this specification nor intended to limit the scope of the invention in any way.