Illinois Statewide Technical Reference Manual

Purpose of IL-TRM

The purpose of the IL-TRM is to provide a transparent and consistent basis for calculating energy (electric kilowatt-hours (kWh) and natural gas therms) and capacity (electric kilowatts (kW)) savings generated by energy efficiency programs administered by the state’s largest electric and gas utilities (Ameren Illinois, Commonwealth Edison Company, Nicor Gas, North Shore Gas, and Peoples Gas).

  • Section 8-103B(j) of the Illinois Public Utilities Act also requires that the “independent evaluator shall follow the guidelines and use the savings set forth in Commission-approved energy efficiency policy manuals and technical reference manuals, as each may be updated from time to time.” 220 ILCS 5/8-103B(j).
  • The IL-TRM Update Process occurs annually and is open to all interested parties. The IL-TRM Version 10.0 update was approved by the Commission in December 2021. The IL-TRM Version 11.0 update process concluded in September 2022. Click here to visit the IL-TRM Version 11.0 page.

Illinois Commerce Commission Webpage

The Illinois Commerce Commission (ICC) also has a IL-TRM webpage which houses all Commission-approved IL-TRMs, Errata documents, ICC Orders related to updates to the IL-TRM and Policy documents, Redlined IL-TRMs showing changes between different versions of the IL-TRM, and related policy documents.

IL-TRM Policy Document

Illinois TRM Policy Document Version 3.1

  • Approved by the Commission in March 2022
  • Edits to Version 3.1 included minor corrections needed following passage of the Climate and Equitable Jobs Act (CEJA) in Illinois in September 2021

Additional Information

  • Participation in IL-TRM Update Process: The IL-TRM Technical Advisory Committee and annual IL-TRM update process is facilitated by VEIC. To join the IL-TRM Technical Advisory Committee and get access to the IL-TRM SharePoint site, please email the Illinois TRM Administrator, VEIC: [email protected].
  • ​IL-TRM Request Tracker: There is a structured process at the beginning of each IL-TRM update cycle for participants to submit new measures and changes to existing measures. Participants may also submit measure requests to the IL-TRM Request Tracker on SharePoint throughout the year. Measure requests submitted past the deadline for annual IL-TRM updates may not be considered until the next update cycle.
  • IL-TRM Workpaper Template: Illinois Statewide IL-TRM Workpaper Template 2019
  • Illinois Net-to-Gross Methodologies: These methodologies are developed by Illinois evaluators and interested stakeholders, through a Working Group separate from the IL-TRM update process. See IL-TRM Volume 4, Attachment A (Illinois Statewide Net-to-Gross Methodologies) for the latest updated methods.

IL-TRM Errata Documents

Annual IL-TRM Update Pages

There is a separate page on the SAG website for each version of the IL-TRM. Click on the links below to access each page.

The links below include final versions of the IL-TRM and associated errata, beginning with the most recently completed (Version 8.0):

ICC Directives Regarding IL-TRM

ICC Dockets – Approval of IL-TRM

  • 13-0077: Adoption of policies for the IL-TRM
  • 12-0528: Approval of IL-TRM Version 1.0
  • 13-0437: Approval of IL-TRM Version 2.0
  • 14-0189: Approval of IL-TRM Version 3.0
  • 15-0187: Approval of IL-TRM Version 4.0
  • 16-0171: Approval of IL-TRM Version 5.0
  • 17-0106: Approval of IL-TRM Version 6.0
  • 18-1605: Approval of IL-TRM Version 7.0
  • 19-0954: Approval of IL-TRM Version 8.0
  • 20-0741: Approval of IL-TRM Version 9.0
  • 21-0751: Approval of IL-TRM Version 10.0

Load Shape References

Sources and References Documents (Final Version 3.0)

Residential Measure References (zip files):

Other reference files (zip files):