Bangkok Metropolis is the largest city of Thailand. It consumes electricity about 30% of the whole country (2006). The residential electricity consumption (REC) in Bangkok Metropolis has increased more than 240% over the past 20-year period. The growth in REC due to climatic and economic factors. This research investigated monthly data of ambient temperature, rainfall, relative humidity, and wind speed during the past 20-year period. And also investigated economic factors, e.g. number of houses, monthly income, and monthly shipment of air-conditioner over 5-year period. The residential electricity consumption of Bangkok Metropolis (RECB) model was created to analyze the impacts of each factor and to forecast the REC of Bangkok Metropolis for future use. (C) 2008 Elsevier B.V. All rights reserved.