Measures and Assumptions List

The OPA Prescriptive Measures and Assumptions List (“Prescriptive List”) is a collection of electricity conservation measures which present deemed energy and demand savings using prescriptive input assumptions (PIAs).  It provides best available information and consistent conservation program assumptions needed to estimate potential gross energy and demand savings which may, in turn, serve as the basis for the design, implementation, and evaluation of conservation and demand management programs.
Purpose and Scope    
Information presented in the Prescriptive List is derived and gathered from various sources ranging from previous evaluation studies involving engineering calculations to in-situ (in its original place) metering studies. Data may also be based on studies undertaken in jurisdictions outside Ontario and updated to reflect Ontario conditions.

This Excel version of the Prescriptive List is a revised and updated version of the 2014 Prescriptive Measures and Assumptions List. Revised input assumptions were based on new information from the results of the OPA's 2013 Program Evaluations. In addition to gross demand and energy savings, the Prescriptive List also includes other useful information about each measure, including:

  • effective useful life
  • estimated incremental life cycle cost
  • end-use load profiles and
  • net-to-gross adjustment factors for both energy and demand savings. 

Please take note that this adjustment factor is a function of program design, delivery, and measure type and is updated on a regular basis through the OPA's annual evaluation process. Details on this information can be found on the Definitions tab or page of the document.

Updating the Prescriptive Measures and Assumptions List        
Measure-level assumptions are reviewed on an annual basis or as new information becomes available. 
Questions regarding individual measures listed in this Prescriptive List can be requested by sending an e-mail to

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