close window

BPI News


BPI HPXML Standard Seeking Input During Public Review Period

posted at 2024-05-31 10:02:00

Saratoga Springs, NY: The Building Performance Institute, Inc. (BPI) is seeking input from the public on BPI 2100, Home Performance Related Data Transfer (the HPXML Transfer Standard). BPI’s Data and Modeling Standards Technical Committee (DM-STC) has approved the release of the draft Version 4.0, for a 45-day public comment period ending on July 22, 2024.  

HPXML is a data transfer protocol that can be used to exchange information between different software systems using an open, free, technology-neutral solution developed through BPI’s ANSI-accredited standards development procedures, with openness, transparency, and a consensus-based approach at its core. 

Constructed by BPI’s HPXML Working Group, which reports to the DM-STC, BPI’s HPXML Transfer Standard can be used to improve efficiency of data collection, reduce time and cost, and allow for transfer of residential energy efficiency data across a wide range of industries.  

Many programs use HPXML, including: 

  • Arizona Public Service  

  • Austin Energy 

  • Efficiency Vermont 

  • New York State Energy Research and Development Authority (NYSERDA) 

  • Pacific Gas & Electric  

  • Pearl Certification 

  • PSEG Long Island 

  • Salt River Project 

  • San Diego Gas & Electric 

  • SoCalGas 

  • Southern California Edison 

  • United Illuminating 

  • and others 

The HPXML Data Transfer Standard, also referred to as a “schema,” follows the Semantic Versioning 2.0 specification to indicate changes and updates. Version numbers follow a pattern of Major, Minor, and Patch (e.g., 2.3.0). When the schema is updated with “breaking changes,” which are changes that make it incompatible with previous versions, the Major version number is increased. Examples of changes that require a major version change include: 

  • Renaming elements,  

  • Removing elements 

  • Moving elements, and  

  • Removing enumerations 

The current draft HPXML standard is considered a major update, moving from Version 3.1 to Version 4.0.  

In addition to the standard, a complete list of breaking and non-breaking changes to the HPXML standard can be found here: 

(Note: Only the changes under the heading “HPXML v4.0 - Release Candidate 4” are under consideration for public review.) 

To submit comments on HPXML, please download the BPI Standards Comment Form.  

Completed forms must be submitted to by July 22, 2024, in order for comments to be considered by the DM-STC.