Fee analysis in water lift stations – scenarios for the mitigation of electric services bills economic impact

Abstract

This paper aims to evaluate the economic and operational situation in a raw water lift station, wich serves two big southern brazilian cities, as provided in the normative resolution nº 414, from september, the ninth, 2010, according to ANEEL. The facility is composed of five motor-pump sets, wich are triggered according to the seasonability of the potable water consumption in the supply system. In the project setup, two motor-pump sets were operational reserves and, therefore, even three machines were actionated in parallel. Since 2016, because of a higher flow operational need available to the supply system, one of the stand-by equipment was put in operation. With the increase of raw water captured volume and the high electric power bills values, the focus os this research is the analysis of the operational annual data, using the EPANET 2.0 software, and proposes the establishment of possible scenarios that may result in decrease of electric power services value. This objective can be reached through two alternatives: hiring a new type of fee and/or reducing the motor-pump sets actionated during the high peak period (with or without contracted demand alteration). The simulations demonstrate that the decrease os the actionated motor-pump sets is feasible, as well as the contracted demand decrease for the same period. By means of simple operational/contractual measures, values close to R$ 21.136,00 by month or R$ 253.632,00 in an year may be reached.