FERC Order 745 allows demand response owners to sell their load reduction in the wholesale market. However, in order to be able to sell the load reduction, some implementation challenges must be addressed, one of which is to establish Customer Baseline Load (CBL) calculation methods with acceptable error performance, which has proven to be very challenging so far. In this paper, the error and financial performance of Randomized Controlled Trial (RCT) method, applied to both granular and aggregated forms of the consumption load, are investigated for a hypothetical demand response program offered to a real dataset of residential customers .