DALLAS – Many Texans may be overpaying for electricity, a survey from Dallas-based online energy marketplace EnergyBot shows. The study, which surveyed 501 customers in Dallas and Houston, showed that the majority of those who signed up for plans with free night and weekend bill credits are paying more than those who signed up for traditional fixed-price plans. As part of the survey, EnergyBot gathered data from the participants, which ranged from Oncor and CenterPoint Energy customers with apartments, small homes and large homes, for a year.