Download the National Energy Modeling System (NEMS)

Overview

NEMS is an integrated model of the U.S. energy system. For an overview of NEMS, see The National Energy Modeling System: An Overview 2023 PDF. More detailed documentation of NEMS is also available.

The open-source NEMS code allows the public to replicate the Annual Energy Outlook 2026 (AEO2026) results and discloses the source code and inputs used.

NEMS is available on GitHub