The intensive organizational evolution worldwide has brought the necessity of storing and handling big volumes of information, by what every time it becomes more expensive to support them in the transactional information systems. For the case of public sector companies, the regulatory entities have raised the quality standards of the service looking that the compensations to the final users are every time minors and that the incentives offered by the government are justified by information and historical facts. These requirements become effective across indicators and reports that demostrate the management realized. But the processing of this information cannot interrupt the normal operation of the companies, by what it is needed to have alternate systems that allow to process big volumes of information with low times of response that in addition support the organizational decision-making process. It is for this reason that the stores of information have played an important role in the last years, since they allow the information needed for the calculation of indicators and the capture of managerial decisions to be consolidated in the same repository of agreement to the information gathered in the different transactional systems. This work shows the creation of a Data Mart to deal with the calculation of the service quality indicators in the Operative Management area from CHEC, which arises due to the regulative needs and the concern over the impact reflected in the income and/or expenditures for concept of the performance of the quality of the energy service. Ralph Kimball’s methodology will be in use as frame of work with support, in some stages, of the methodology HEFESTO proposed by the Ing. Ricardo Dario Bernabeu, which allows to obtain earlier results on having applied good practices described in the latter methodology.