This paper presents an analysis of the demand response application strategy for residential users. The report starts with modeling the demand curve for regularly periods from a dataset. Subsequently, IEEE 39 standard power system was used as a testbed where the standardized demand curves are applied and scaled to an interest voltage level. The case study uses Colombian energy demand data, and the analysis is carried out based on voltage magnitude at busbars, which is the electrical variable of concern. The demand response strategy adopted is the time-of-use tariff that assigns rate benefits depending on the demand blocks defined by the system operator. The results lead to the voltage magnitudes showing a flattening in their hourly profile when there is a higher level of penetration of the demand response. Additionally, an inverse correlation is demonstrated between demand energy consumption and voltage magnitude, as expected.