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National Renewable Energy Laboratory

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  1. api-umbrella api-umbrella Public

    Open source API management platform

    Ruby 2.1k 351

  2. EnergyPlus EnergyPlus Public

    EnergyPlus™ is a whole building energy simulation program that engineers, architects, and researchers use to model both energy consumption and water use in buildings.

    C++ 1.3k 452

  3. OpenStudio OpenStudio Public

    OpenStudio is a cross-platform collection of software tools to support whole building energy modeling using EnergyPlus and advanced daylight analysis using Radiance.

    C++ 559 219

  4. SAM SAM Public

    System Advisor Model (SAM)

    C++ 410 197

  5. floris floris Public

    A controls-oriented engineering wake model.

    Python 262 180

  6. OpenOA OpenOA Public

    This library provides a framework for assessing wind plant performance using operational assessment (OA) methodologies that consume time series data from wind plants. The goal of the project is to …

    Jupyter Notebook 219 83

Repositories

Showing 10 of 740 repositories
  • ssc Public

    SAM Simulation Core (SSC) contains the underlying performance and financial models for SAM

    NREL/ssc’s past year of commit activity
    C++ 89 BSD-3-Clause 112 28 6 Updated Oct 31, 2025
  • chronify Public
    NREL/chronify’s past year of commit activity
    Python 5 BSD-3-Clause 6 22 (1 issue needs help) 5 Updated Oct 31, 2025
  • REopt_API Public

    The model for the REopt API, which is used as the back-end for the REopt Webtool (reopt.nrel.gov/tool), and can be accessed directly via the NREL Developer Network (https://developer.nrel.gov/docs/energy-optimization/reopt)

    NREL/REopt_API’s past year of commit activity
    Python 113 62 43 7 Updated Oct 31, 2025
  • EnergyPlus Public

    EnergyPlus™ is a whole building energy simulation program that engineers, architects, and researchers use to model both energy consumption and water use in buildings.

    NREL/EnergyPlus’s past year of commit activity
    C++ 1,337 452 902 39 Updated Oct 31, 2025
  • OpenStudio-ERI Public

    Energy Rating Index (ERI) calculation via OpenStudio/EnergyPlus.

    NREL/OpenStudio-ERI’s past year of commit activity
    Ruby 23 18 7 5 Updated Oct 31, 2025
  • cmlm Public

    Code for generating/testing reduced-order manifold turbulent combustion models, for stand alone analysis and use with the Pele suite of reacting flow solvers. Supports both tabulated physics-based approaches and machine learning/neural network approaches.

    NREL/cmlm’s past year of commit activity
    Python 2 BSD-3-Clause 9 0 0 Updated Oct 31, 2025
  • ALchemist Public
    NREL/ALchemist’s past year of commit activity
    Python 2 BSD-3-Clause 1 0 0 Updated Oct 30, 2025
  • NEB-Tool Public

    A user friendly, graphical, open-source application (Web/Mac/Windows) of the multiple benefits framework for non-energy benefits, incorporating additional aspects to make the tool effective for use in the United States.

    NREL/NEB-Tool’s past year of commit activity
    TypeScript 2 8 52 2 Updated Oct 30, 2025
  • WattAMeter Public

    Python package for monitoring and recording power usage, energy consumption, and performance metrics from hardware components such as GPUs and CPUs

    NREL/WattAMeter’s past year of commit activity
    Python 1 BSD-3-Clause 0 0 0 Updated Oct 30, 2025
  • resstock Public

    Highly granular modeling of residential building stocks at national, regional, and local scales using OpenStudio/EnergyPlus.

    NREL/resstock’s past year of commit activity
    Ruby 132 81 68 (2 issues need help) 19 Updated Oct 30, 2025