Abstract: The present invention relates to a movable support system comprising a fixed part, intended to be fixed for example to the frame of a roof, and a moving part that opens completely downwards and towards the interior of the building, and able to be completely removed towards the interior of the building so as to make it easier to fit it or replace it should this be necessary, serving for various energy recovery devices such as a wind turbine, a solar water heater or a photovoltaic solar cell, making it possible, by an assembly means, to fit and maintain it via the interior of the building, and to a concept for a wind turbine, solar water heater or photovoltaic solar cell which is fitted to this support system.