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The California Commercial End Use Survey (CEUS) project is being conducted for the California Energy Commission (CEC) by Itron, Inc. with support from KEMA-Xenergy, ADM Associates, and James J. Hirsch & Associates. The project is a massive effort designed to gain a detailed knowledge of end-use energy in commercial buildings in California. The basic premise of the CEUS project is: Collect detailed information via an onsite survey for a sample of 2,800 commercial establishments from across the state, use that data and an automated system to create detailed end-use building simulation models, then calibrate the models using all available information including billed electric and natural gas use, time-of-use logger data for inside lighting and HVAC fans, and interval metered data. The database of commercial building characteristics and calibrated end use simulation results contained in the DrCEUS system will then be used by the CEC and others for an endless variety of applications. The purpose of this paper is to describe the DRCEUS system that was developed to facilitate and accomplish the California CEUS project.