In the Brazilian electric sector, the regulatory model is the mechanism through which it s keep the interest equilibrium of all organizations that operates in this sector and, this happens, from the balance between its internal rationality and external environment, thus to provide favorable conditions to the production, transmission and distribution of energy, and, for the benefit of the society. The main objective of this dissertation is to point how the dynamics between the actors in the electric sector - the consumers, regulatory agency, distribution, transmission and generation companies of energy - influence the form that they respond to the regulatory model proposed, either creating obstacles, either facilitating the institutionalization of that model. As defined, the case study was the electric distribution companies because this case possess particular characteristics in the sector. The carried research involved interviews with a joint varied of representatives actors of the electric sector field, and the feelings caught had emphasized the negative influences of the actors dynamics in the form that the distribution companies answer to the regulatory model. Among the institutional mechanisms that were recognized and had been analyzed in the actors behavior, it is the institutional isomorphism, the inconstancy of the regulatory model and the field delayed structuration and the power relations of privileging particular interests in detriment of the field. From these results, the study conclusion points that an optimum regulatory model will only be reached with the success of the regulatory agency, what, in turn, depends on the strongness of the regulatory culture on the electric sector field that will allow them to have autonomy and legitimacy.