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A project to convert the Excel based Energy Performance Calculator to Python
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Open source.

Download the Excel version of the EPC at A project to convert the Excel based Energy Performance Calculator to Python Because the EPC is in Excel its market penetration remains low. Engineers usually cannot accept comparative results from an Excel based tool. Let's code the EPC into Python so it can be used on the web or within Dynamo for Revit or Grasshopper for Rhino.

  • Patrick Chopson


  • The EPC (Energy Performance Calculator) is an Excel based energy modeling software.
  • Instant results no waiting for calculation results.
  • Reduces a building down to “box”
  • Developed for 20 years by the Georgia Institute of Technology High Performance Building Group.
  • Normative energy calculator defined by ISO 13970 and CEN 15603.
  • Monthly and Hourly versions proven superior to dynamic simulation dynamic simulation methods in ASHRAE 90.1, Appendix G.


The Use of Normative Energy Calculation Beyond Building Performance Rating Systems

Management of Building Energy Consumption and Energy Supply Network on Campus Scale

Comparative Study of LEED and ISO-CEN Building Energy Performance Rating Methods


EPC-To-Python started by Patrick Chopson is licensed under GNU General Public License.

EPC - Energy Performance Calculator

Copyright (C) 2008-2015  High Performance Building Group 245 4th St. NW, Atlanta, GA 30332, USA

Contact Person: Fried Augenbroe (

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.

You can obtain a full copy of the license document from

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