Summary of Legislation and Regulations Included in the Annual
The version of the National Energy Modeling System (NEMS) used for our Annual Energy Outlook 2025 (AEO2025) generally represents legislation, environmental regulations, and international protocols,
Codes 101 | Building Energy Codes Program
State and local building energy codes are based on the “model codes,” which are the International Energy Conservation Code (IECC) and ANSI/ASHRAE/IES Standard 90.1 (ASHRAE). The model
Federal Energy Efficiency Standards Program: Background and
The federal Appliance and Equipment Standards Program, a national program setting minimum efficiency standards for a variety of consumer and industrial products, was first authorized as a
Federal Energy Management Laws and Requirements
The Federal Energy Management Program (FEMP) provides guidance, reference materials, and resource links to help agencies comply with federal laws and requirements.
Federal Energy Efficiency Standards Program: Background and
Section 325 of EPCA seeks to both "provide federal energy conservation standards applicable to covered products" and "authorize the Secretary to prescribe amended or new energy
Standards and Guidelines
Preview ASHRAE Standards and Guidelines Free read-only access for ASHRAE Standards and Guidelines is provided to you after completing and agreeing to the registration terms. Each link will
Energy Codes and Standards
These tables list the minimum and maximum requirements for the R- and U-values of materials, the allowable watts per square foot of lighting systems, and the minimum energy efficiencies required of
Building Energy Efficiency Standards
The Building Energy Efficiency Standards serve to reduce wasteful, uneconomical, and unnecessary uses of energy for the state. They include requirements in the Energy Code (Title 24,
Regulations, Standards, and Incentives
Find state government and utility requirements and incentives for renewable energy. The database is operated by the N.C. Clean Energy Technology Center at N.C. State University.
Renewable energy explained
Renewable portfolio standards (RPS) and clean energy standards (CES) are either requirements or goals for energy producers or providers to supply energy from low- or zero-carbon