Illinois Statewide Technical Reference Manual

IL-TRM Update Version 15.0

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. The IL-TRM Technical Advisory Committee and annual IL-TRM update process is facilitated by VEIC. To join the IL-TRM Technical Advisory Committee, please email [email protected].

Illinois Commerce Commission Webpage

The Illinois Commerce Commission (ICC) 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

IL-TRM Policy Document Version 4.0 (Final)

  • The Version 4.0 update was approved by the ICC in December 2023.

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: The IL-TRM Workpaper Template is available here on SharePoint.
  • 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 that is facilitated by Illinois evaluators. See IL-TRM Volume 4, Attachment A (Illinois Statewide Net-to-Gross Methodologies) for the latest methods.

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.

Compiled IL-TRM Documents, Versions 1 through 15, with Errata Memos

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
  • 22-0603: Approval of IL-TRM Version 11.0
  • 23-0709: Approval of IL-TRM Version 12.0
  • 24-0750: Approval of IL- TRM Version 13.0
  • 25-0938: Approval of IL-TRM Version 14.0

Load Shape References

Sources and References Documents from IL-TRM Version 3.0

Residential Measure References (zip files):

Other reference files (zip files):