EnergyPlus
Whole-building energy simulation engine for heating, cooling, and daylighting
- Vendor
- U.S. Department of Energy / NREL
- License
- Open Source
- Platforms
- Windows, macOS, Linux
- Official site
- energyplus.net/ ↗
EnergyPlus is the DOE's open-source building-energy engine: sub-hourly heat balance, HVAC systems, daylighting, and renewable integration for whole-building performance analysis. It powers most modern building-energy front ends (OpenStudio, DesignBuilder, Ladybug tools) and underlies many code-compliance workflows.
Best for: energy modelers, architects, and researchers evaluating envelope, HVAC, and net-zero design options.
Consider alternatives when you need fast early-phase massing studies — simplified tools trade rigor for speed — or district-scale simulation (URBANopt builds on it).
EnergyPlus articles & guides
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EnergyPlus: Building Energy Simulation for Demand Response and Grid-Interactive Building Design
EnergyPlus is the DOE's industry-standard whole-building energy simulation engine, enabling engineers to model sub-hourly thermal and electrical behavior of buildings with high fidelity. Its EnergyManagementSystem (EMS) and Python API allow custom demand response control logic, pre-cooling strategies, and battery dispatch algorithms to be scripted directly into the simulation. This article explores EnergyPlus's heat balance architecture, EMS workflow, and practical methods for generating high-resolution load profiles that feed into grid simulation tools.