GB/T 27736-2011 "General Rules for Calculation Methods of System Energy Balance in the Production Process of Pulp and Paper Enterprises" specifies the calculation principles, methods, and requirements for the system energy balance in the production processes of pulp and paper enterprises, applicable to various production systems within such enterprises. It clarifies the boundary division of energy balance, reference conditions, and the classification of energy income and expenditure items. The standard standardizes the calculation methods for energy inputs such as fuels, electricity, and steam, as well as energy outputs such as products and waste heat. It also requires the preparation of energy balance tables and result analysis, providing a unified basis for enterprise energy consumption management and optimization.