The Regulatory Assistance Project, in partnership with the Energy Foundation and NRDC, commissioned E3, a consulting firm in San Francisco, to develop an energy efficiency assessment calculator tailored for use in China. This calculator is available free of charge, operates in Chinese, and is intended to be useful to Chinese policymakers concerned with energy efficiency, administrators of portfolios of energy efficiency projects, and managers of energy service companies. This document provides additional background information about the EPP calculator.