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    752 repositories

    • openstudio-model-articulation-gem

      Public
      Ruby
      •
      Other
      •21•10•34•3•Updated Jan 2, 2026Jan 2, 2026

    • docker-openstudio

      Public
      Repository for managing the builds of OpenStudio Docker images.
      Dockerfile
      •19•22•9•0•Updated Jan 1, 2026Jan 1, 2026

    • marbles

      Public
      Lattice Boltzmann method solver using adaptive mesh refinement
      adaptive-mesh-refinementamrexlattice-boltzmann-method
      Jupyter Notebook
      •
      Apache License 2.0
      •14•14•3•2•Updated Jan 1, 2026Jan 1, 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
      •
      Other
      •19•54•53•20•Updated Jan 1, 2026Jan 1, 2026

    • spades

      Public
      Parallel Discrete Events Simulation for heterogenous architectures (e.g., GPUs)
      amrex
      C++
      •
      Apache License 2.0
      •1•3•0•1•Updated Jan 1, 2026Jan 1, 2026

    • windwatts

      Public
      TypeScript
      •
      BSD 3-Clause "New" or "Revised" License
      •9•3•39•4•Updated Jan 1, 2026Jan 1, 2026

    • reVRt

      Public
      The reV Routing tool introduces a spatially-aware, least-cost-path methodology that allows users to consider siting constraints, regional component costs, land composition costs, point-of-interconnection costs, and network upgrade costs to estimate the transmission infrastructure requirements for new electrical grid connections.
      Python
      •
      BSD 3-Clause "New" or "Revised" License
      •1•2•41•1•Updated Jan 1, 2026Jan 1, 2026

    • torc

      Public
      Workflow management system
      hpcslurmpipelinesworkflows
      Rust
      •
      BSD 3-Clause "New" or "Revised" License
      •2•3•2•0•Updated Jan 1, 2026Jan 1, 2026

    • REopt.jl

      Public
      Julia
      •
      Apache License 2.0
      •46•38•90•39•Updated Jan 1, 2026Jan 1, 2026

    • OCHRE

      Public
      A Python-based building energy modeling (BEM) tool designed to model flexible loads in residential buildings
      buildingsresidentialload-shiftingdistributed-energy-resourcesresidential-controls
      Python
      •
      BSD 3-Clause "New" or "Revised" License
      •31•68•87•6•Updated Jan 1, 2026Jan 1, 2026

    • reV-tutorial

      Public
      Tutorials for using the Renewable Energy Potential Model (reV)
      PowerBuilder
      •7•6•0•1•Updated Dec 31, 2025Dec 31, 2025

    • 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.
      traininglaboratoryperformanceenergyhpclabslurmnationalcomputinghigh
      Jupyter Notebook
      •
      Other
      •82•135•55•13•Updated Dec 31, 2025Dec 31, 2025

    • openstudio-standards

      Public
      Ruby
      •
      Other
      •66•100•59•4•Updated Dec 31, 2025Dec 31, 2025

    • H2Integrate

      Public
      PowerBuilder
      •
      BSD 3-Clause "New" or "Revised" License
      •26•18•138•9•Updated Dec 31, 2025Dec 31, 2025

    • PVDegradationTools

      Public
      Set of tools to calculate degradation responses and degradation related parameters for PV.
      pythonreliabilitydegradationphotovoltaic-systemspv-modulesduramat
      Jupyter Notebook
      •
      Other
      •22•42•42•8•Updated Dec 31, 2025Dec 31, 2025

    • 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
      •
      Other
      •28•46•60•6•Updated Dec 31, 2025Dec 31, 2025

    • Marmot

      Public
      Marmot is a data formatting and visualization tool for production cost and capacity expansion modelling results. It provides an efficient way to combine and view disaggregated results, while also creating publication ready figures and data tables.
      pythonpcmcemenergy-analysis
      Python
      •
      Other
      •12•8•17•1•Updated Dec 31, 2025Dec 31, 2025

    • hpxml_version_translator

      Public
      Converts an HPXML file to a newer version
      Python
      •
      BSD 3-Clause "New" or "Revised" License
      •8•2•1•2•Updated Dec 31, 2025Dec 31, 2025

    • OpenStudio-HPXML

      Public
      Modeling of residential buildings in EnergyPlus using OpenStudio/HPXML.
      Ruby
      •
      Other
      •27•57•125•18•Updated Dec 31, 2025Dec 31, 2025

    • bambam

      Public
      Rust
      •
      BSD 3-Clause "New" or "Revised" License
      •2•1•9•1•Updated Dec 31, 2025Dec 31, 2025

    • hercules

      Public
      Hercules
      Python
      •
      BSD 3-Clause "New" or "Revised" License
      •19•6•11•1•Updated Dec 31, 2025Dec 31, 2025

    • BHResist

      Public
      Python
      •
      Other
      •1•0•1•0•Updated Dec 31, 2025Dec 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.
      C++
      •
      Other
      •458•1.4k•901•35•Updated Dec 31, 2025Dec 31, 2025

    • 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.
      energyplusopenstudioopenstudio-sdk
      C++
      •
      Other
      •222•573•227•8•Updated Dec 31, 2025Dec 31, 2025

    • api-umbrella

      Public
      Open source API management platform
      nginxluaapi-managementapi-gatewayluajitopenrestyapi-manager
      Ruby
      •
      MIT License
      •362•2.1k•228•6•Updated Dec 31, 2025Dec 31, 2025

    • opencommunications

      Public
      Open Communications profile is Aquia Lightning sub-distribution for NREL/DOE Drupal 8 sites.
      JavaScript
      •8•1•0•5•Updated Dec 30, 2025Dec 30, 2025

    • SAM

      Public
      System Advisor Model (SAM)
      C++
      •
      BSD 3-Clause "New" or "Revised" License
      •203•421•85•5•Updated Dec 30, 2025Dec 30, 2025

    • wex

      Public
      WEX, which is short for WxWidgets Extensions, is a cross-platform library of graphical user interface tools that extends the popular open-source project WxWidgets. WEX includes many features including the powerful DView program (https://github.com/NREL/wex/wiki/DView), which provides an easy-to-use way to visualize complex time series data.
      C
      •
      BSD 3-Clause "New" or "Revised" License
      •33•64•28•0•Updated Dec 30, 2025Dec 30, 2025

    • ssc

      Public
      SAM Simulation Core (SSC) contains the underlying performance and financial models for SAM
      C++
      •
      BSD 3-Clause "New" or "Revised" License
      •114•90•30•7•Updated Dec 30, 2025Dec 30, 2025

    • developer.nrel.gov

      Public
      An issue tracker for NREL's APIs available at https://developer.nrel.gov
      HTML
      •56•55•17•3•Updated Dec 30, 2025Dec 30, 2025