Net-to-Gross (NTG) Framework

SAG holds annual teleconference meetings each September to review recommended Net-to-Gross (NTG) ratios prepared by independent evaluators and reach agreement on NTG ratios for the next program year, as described in the Illinois Energy Efficiency Policy Manual, posted on the Policy page. Please see below for annual NTG page links.

Additional Information

• “Net-to-Gross (NTG) Ratio” means a factor representing net savings divided by gross savings that is applied to gross impacts to convert them into net impacts. The factor itself may be made up of a variety of factors that create differences between gross and net savings, commonly including Free Riders and Spillover. The factor can be estimated and applied separately to either energy or demand savings.
• For information on Illinois NTG policies, see Illinois Energy Efficiency Policy Manual Version 3.1, Section 7.2 (Net-to-Gross Policy), Section 7.3 (NTG Ratio for Income Eligible Programs), and Section 7.4 (NTG Ratio for Disadvantaged Areas). The Policy Manual is posted on the Policy page.
• The following memos provide additional background:
  • Memo from Guidehouse to ComEd, Ameren Illinois, Nicor Gas, Peoples Gas and North Shore Gas: Net-to-Gross Ratios for Pilot Programs (August 13, 2025)
  • Comparison of IL NTG Approaches Memo – from Opinion Dynamics Corp. to SAG (August 2014)
  • Net-to-Gross Framework Memo (March 2010)

2026 NTG Values

• Click here for information on evaluator NTG recommendation meetings held in September 2025, for the program year beginning January 1, 2026.

2025 NTG Values

• Click here for information on evaluator NTG recommendation meetings held in September 2024, for the program year beginning January 1, 2025.

2024 NTG Values

• Click here for information on evaluator NTG recommendation meetings held in September 2023, for the program year beginning January 1, 2024.

2023 NTG Values

• Click here for information on evaluator NTG recommendation meetings held in September 2022, for the program year beginning January 1, 2023.

2022 NTG Values

• Click here for information on evaluator NTG recommendation meetings held in September 2021, for the program year beginning January 1, 2022.

2021 NTG Values

• Click here for information on evaluator NTG recommendation meetings held in September 2020, for the program year beginning January 1, 2021.

2020 NTG Values

• Click here for information on evaluator NTG recommendations for the program year beginning January 1, 2020. NTG values were finalized in September 2019.

2019 NTG Values

• Click here for information on evaluator NTG recommendations for programs that began January 1, 2019. NTG values were finalized in September 2018.

2018 NTG Values

• Click here for information on evaluator NTG recommendations for 2018 (including Electric Program Year 10 and Gas Program Year 7). NTG values were finalized in February, 2017.

2017 NTG Values

• Click here for information on evaluator NTG recommendations for Electric Program Year 9 (EPY9) and Gas Program Year 6 (GPY6). NTG values were finalized in February 2016.

2012 – 2015 NTG Materials

• Click here for information on evaluator NTG recommendations for annual NTG process meetings held from 2012 to 2015, including the following program years:
  • 2012 NTG Update Process: Electric Program Year 5/Gas Program Year 2 (June 1, 2012 to May 31, 2013)
  • 2013 NTG Update Process: ElectricProgram Year 6/Gas Program Year 3 (June 1, 2013 to May 31, 2014)
  • 2014 NTG Update Process: Electric Program Year 7/Gas Program Year 4 (June 1, 2014 to May 31, 2015)
  • ​2015 NTG Update Process: Electric Program Year 8/Gas Program Year 5 (June 1, 2015 to May 31, 2016)