Evaluator NTG Recommendations for 2019

SAG holds annual teleconference meetings to review recommended NTG values prepared by independent evaluators and reach agreement on NTG values for the next Program Year. See below for background information and final Net-to-Gross materials. NTG discussions for the program year beginning on January 1, 2019 were held in September 2018. Draft NTG recommendations are removed from this page after NTG values are finalized.

Corrected NTG Documents – Northern Illinois Utilities (4/15/19)

Navigant corrected an error in the documents below. NTG recommendations finalized in fall 2018 did not reflect the IL-TRM v 7.0 specification that faucet aerators (bathroom and kitchen) and showerheads of residential programs should have their free ridership set at 0 (when estimating gross savings using the IL-TRM specified baseline average water flow rate).

Supplemental NTG Ratios

Final NTG Values (10/1/18)

NTG Evaluation Research Memos

Revised Memos

Final Memos

Background

  • See Policy Manual Version 1.1, Section 7.2 (Net-to-Gross Policy) for additional information on this process. Excerpted language from the Policy Manual:
  • 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.
  • 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. Evaluators shall report final deemed NTG values on or before October 1.

Consensus Process (see Policy Manual Version 1.1):

  • The purpose of [the NTG meetings] 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.