Evaluator NTG Recommendations for 2025

SAG holds annual meetings to review recommended Net-to-Gross (NTG) values prepared by independent evaluators and reach agreement on NTG values for the next program year, as described in the Illinois Energy Efficiency Policy Manual.

  • SAG NTG discussions for the program year beginning on January 1, 2025 will be held in September 2024.
  • As required by the Policy Manual, evaluators share initial recommended NTG values with SAG by September 1 of each year, and NTG values  must be finalized by October 1.
  • Draft NTG research for the 2024 NTG update process will be posted on this webpage.
  • Final NTG research is posted on the Final NTG Research Memos webpage.

See below for additional information about this process.

Final Evaluator Net-to-Gross Recommendations

2024 Net-to-Gross Meetings

NTG Meeting #1: Wednesday, September 4, 2024

NTG Meeting #2: Wednesday, September 11, 2024

NTG Meeting #3: Wednesday, September 18, 2024

NTG Meeting #4: Wednesday, September 25, 2024

Final Net-to-Gross Research Informing 2025 Recommendations

Ameren Illinois

ComEd

Nicor Gas

Peoples Gas and North Shore Gas

Joint Research (Northern Illinois Utilities)

Background and Process

  • Net-to-Gross (NTG) Ratio [also referred to as a NTG value] 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.
  • Net-to-Gross Values are produced annually by the independent evaluators, reviewed by stakeholders, and finalized by October 1 of each year. New Net-to-Gross values are prospectively effective January 1, three (3) months after they are finalized.
  • In developing the evaluators’ final recommended deemed NTG ratios, evaluators shall review SAG feedback, take into account all comments and discussions, with the intent of making their best estimate of future actual NTG ratio values for the upcoming Program Year.
  • Please note the following excerpted policy on consensus: If the SAG cannot reach consensus on an appropriate NTG Ratio value to deem for the upcoming Program Year prior to October 1, then the Evaluators’ final recommended deemed NTG Ratio shall be deemed.
  • See below for policy language excerpted from Policy Manual Version 2.1.

Net-to-Gross Policy

See Illinois Energy Efficiency Policy Manual Version 3.0, Section 7.2, Net-to-Gross Policy:

Adoption of the NTG Policy will become effective for the first Program Year in the Energy Efficiency Plan whose implementation commences January 1, 2018 and annually thereafter. The NTG Policy described herein applies to Section 8-103B and 8-104 Programs. Exception: For the first Program Year whose implementation commences January 1, 2018, the Evaluators’ final deemed NTG Ratio values shall be provided by May 30, 2017.

Evaluators’ initial recommended deemed NTG Ratios for the upcoming Program Year and associated rationale shall be submitted to Program Administrators, Commission Staff and the SAG by September 1 of each year. Evaluators shall follow a consistent format that includes consistent information. In early September of each year, Evaluators will present their initial recommended deemed NTG Ratios for each Energy Efficiency Program, Sub-Program, and/or Measure group (where applicable) to SAG, intended to represent their best estimates of future actual NTG Ratio values likely to occur for the upcoming Program Year. The purpose of this meeting will be for the Evaluators to present their rationale for each NTG Ratio value and provide the SAG, in their advisory role, with an opportunity to question, challenge and suggest modifications to the Evaluators’ initial recommended deemed NTG Ratios for the upcoming Program Year.

SAG participants, including Evaluators, shall make best efforts to reach consensus regarding NTG Ratios appropriate for deeming for the upcoming Program Year that are representative of the best estimates of future actual NTG Ratio values likely to occur for the upcoming Program Year. If the SAG reaches consensus regarding an appropriate NTG Ratio to deem prior to October 1, then SAG’s consensus NTG Ratio shall be deemed for the upcoming Program Year, even if it is different from the Evaluators’ initial recommended deemed NTG Ratio. If the SAG cannot reach consensus on an appropriate NTG Ratio value to deem for the upcoming Program Year prior to October 1, then the Evaluators’ final recommended deemed NTG Ratio shall be deemed, which may be different from the Evaluators’ initial recommended deemed NTG Ratio. In developing the Evaluators’ final recommended deemed NTG Ratio, Evaluators shall review SAG feedback, take into account all comments and discussions, with the intent of making their best estimate of future actual NTG Ratio values for the upcoming Program Year. Evaluators shall report final deemed NTG values on or before October 1.

In general, for Income Eligible Programs, the NTG Ratio is deemed at 1.0. In the event Illinois NTG Income Eligible evaluation research leads the Evaluators and stakeholders to believe the best estimate of the future actual NTG Ratio for an Income Eligible Program is significantly different than 1.0 for the applicable Program Year, for that utility, then the final deemed NTG Ratio for the Income Eligible Program may differ from 1.0. While there may be reasons why Income Eligible NTG evaluation research for one Program Administrator may not be applicable to another Program Administrator in Illinois, there are situations where such research may be applicable. Evaluators will make recommendations as part of the annual NTG process on the applicability of such research for the applicable Program Year.

In the event a new Energy Efficiency pilot Program, Sub-Program, Measure group, and/or special project arises after October 1, Evaluators will supply recommended deemed NTG Ratios as soon as practical, which may be based on secondary research, when that research produces relevant results, and that are intended to represent the Evaluators’ best estimates of actual NTG Ratio values likely to occur for the relevant Program Year. Otherwise a NTG Ratio of 0.80 will be deemed. Evaluators may seek feedback from SAG regarding an appropriate NTG Ratio to deem for the new Energy Efficiency pilot Program, Sub-Program, and/or Measure group. For special projects, Evaluators may determine a project-specific NTG Ratio upfront and deem the project specific NTG Ratio for the life of the project. 

Additional Net-to-Gross Policies