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    • rex

      Public
      REsource eXtraction Tool (rex)
      Python
      252971Updated Jan 22, 2026Jan 22, 2026
    • Open source API management platform
      Ruby
      3662.1k2298Updated Jan 22, 2026Jan 22, 2026
    • r2x-plexos

      Public
      Repo for plugin of PLEXOS
      Python
      1206Updated Jan 22, 2026Jan 22, 2026
    • DynamicLineRatings

      Public
      Jupyter Notebook
      10600Updated Jan 22, 2026Jan 22, 2026
    • geoPFA

      Public
      Geothermal Play Fairway Analysis
      Python
      1302Updated Jan 22, 2026Jan 22, 2026
    • REopt.jl

      Public
      Julia
      47389139Updated Jan 22, 2026Jan 22, 2026
    • OpenStudio-HPXML

      Public
      Modeling of residential buildings in EnergyPlus using OpenStudio/HPXML.
      Ruby
      276012319Updated Jan 22, 2026Jan 22, 2026
    • alfalfa

      Public
      Alfalfa is a web service that enables runtime interaction with building energy models (OpenStudio/EnergyPlus and FMUs compiled from Modelica or Spawn) over REST APIs.
      Python
      19555324Updated Jan 21, 2026Jan 21, 2026
    • OpenStudio-PAT

      Public
      The Parametric Analysis Tool (PAT) is part of the OpenStudio collection of software tools.
      Ruby
      18347129Updated Jan 21, 2026Jan 21, 2026
    • SolTrace

      Public
      SolTrace
      C++
      4451343Updated Jan 21, 2026Jan 21, 2026
    • buildstockbatch

      Public
      Python
      21265016Updated Jan 21, 2026Jan 21, 2026
    • pySMARTS

      Public
      Python wrapper for SMARTS2, Simple Model of the Atmospheric Radiative Transfer of Sunshine
      Python
      111820Updated Jan 21, 2026Jan 21, 2026
    • ComStock

      Public
      National scale modeling of the U.S. commercial building stock supported by U.S. DOE, LADWP, and others and maintained by NREL
      Ruby
      2847617Updated Jan 21, 2026Jan 21, 2026
    • FuelLib

      Public
      FuelLib is a library that utilizes the group contribution method (GCM) for calculating thermodynamic properties of hydro-carbon jet fuels.
      Python
      3200Updated Jan 21, 2026Jan 21, 2026
    • soogo

      Public
      Surrogate-based 0-th Order Global Optimization for black-box problems.
      Python
      9501Updated Jan 21, 2026Jan 21, 2026
    • bifacial_radiance

      Public
      Toolkit for working with RADIANCE for the ray-trace modeling of Bifacial Photovoltaics
      HTML
      57102821Updated Jan 21, 2026Jan 21, 2026
    • hsds-examples

      Public
      Examples of using the HSDS Service to Access NREL WIND Toolkit data
      Jupyter Notebook
      5212540Updated Jan 21, 2026Jan 21, 2026
    • openstudio-standards

      Public
      Ruby
      66101588Updated Jan 21, 2026Jan 21, 2026
    • 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++
      4611.4k90027Updated Jan 21, 2026Jan 21, 2026
    • HPC

      Public
      A collection of various resources, examples, and executables for the general NREL HPC user community's benefit. Use the following website for accessing documentation.
      Jupyter Notebook
      85141559Updated Jan 21, 2026Jan 21, 2026
    • H2Integrate

      Public
      PowerBuilder
      27189812Updated Jan 21, 2026Jan 21, 2026
    • bambam

      Public
      Rust
      21163Updated Jan 21, 2026Jan 21, 2026
    • r2x-reeds

      Public
      Reeds parser and models
      Python
      2232Updated Jan 21, 2026Jan 21, 2026
    • chronify

      Public
      Python
      75224Updated Jan 21, 2026Jan 21, 2026
    • reV-tutorial

      Public
      Tutorials for using the Renewable Energy Potential Model (reV)
      PowerBuilder
      7600Updated Jan 21, 2026Jan 21, 2026
    • ALchemist

      Public
      Python
      2200Updated Jan 21, 2026Jan 21, 2026
    • NREL.gov APP branded theme for Bootstrap 3 - based on nrel-app-template - https://github.com/NREL/nrel-app-template
      Twig
      7000Updated Jan 21, 2026Jan 21, 2026
    • OCHRE

      Public
      A Python-based building energy modeling (BEM) tool designed to model flexible loads in residential buildings
      Python
      3270887Updated Jan 21, 2026Jan 21, 2026
    • ComStock.github.io

      Public
      Jupyter Notebook
      10101Updated Jan 21, 2026Jan 21, 2026
    • get-resstock

      Public
      ResStock customized for the ICF / SoCalGas Gas Emerging Technologies project
      Ruby
      1163Updated Jan 21, 2026Jan 21, 2026