The National Energy Modeling System (NEMS) is a long-term energy-economy modeling system of U.S. energy markets. The model is used to project production, imports, exports, conversion, consumption, and prices of energy, subject to user-defined assumptions. The assumptions encompass macroeconomic and financial factors, world energy markets, resource availability and costs, behavioral and technological choice criteria, technology characteristics, and demographics. EIA's Office of Energy Analysis develops and maintains NEMS to support the Annual Energy Outlook (AEO). The NEMS model was open sourced in 2024 for the 2023 version of AEO. Beyond the model itself, the inputs for NEMS contains valuable data. Archived from https://github.com/EIAgov/NEMS This archive contains raw input data for the Public Utility Data Liberation (PUDL) software developed by Catalyst Cooperative. It is organized into Frictionless Data Packages. For additional information about this data and PUDL, see the following resources: The PUDL Repository on GitHub PUDL Documentation Other Catalyst Cooperative data archives