A structural zone partitioning methodology of complex uncertain structural-acoustic systems is presented. This methodology is based on an energy field formulation of the vibroacoustic problem. In this energy-field formulation, the vibroacoustic system is modelled using statistical averaging over independent realizations of a probabilistic vibroacoustic model. In the vibroacoustic energy model, excitations are represented in terms of input power, observations are represented in terms of response power, and the propagation between excitation and observation points is represented by a set of Power Frequency Response Functions (PFRF).When statistically averaged, these parameters are linearly related to form the equation of the vibroacoustic energy model. It is shown that above a given frequency the power frequency response functions are much less dependant, on the direction or on the precise location of the excitation or the observation, than the classical frequency response functions. An application of this partitioning methodology to an automotive vehicle structure is presented.