The invention relates to a method for the decomposition (E) of a marginal cost (cm) of an electric power (T, D, R) in utilization costs (CG1, CG2, CG3, CG4) of production means an electrical park in a given state of equilibrium, comprising the steps of: • receiving (E1) information relating to the state of equilibrium of the electric park, said information comprising: ○ characteristics (G1, G2 , G3, G4) means of production, and ○ a level (P) and a cost of use (CG1, CG2, CG3, CG4) means of production, • decomposition (E2) of the marginal cost (cm) from of the information received, by combining the utilization costs (CG1, CG2, CG3, CG4) of at least two means of production.
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