Webinar: Best of IEPEC – Cage Match or Happy Couple?  Engineering Simulation Models and Billing Analysis

Join us for a webinar on February 26 at 12:00 PM EST.

Register now!

In case you missed it, we’re highlighting some of the best presentations from IEPEC 2015.

Billing analysis and engineering models are often seen as competing methods and are used in relative isolation. This webinar will describe the strengths, weaknesses and best uses of engineering simulation models and billing analysis – both separately and together.


  • Lauren Gage, Bonneville Power Administration
  • Dave Baylon, Ecotope
  • Josh Rushton, Rushton Analytics
  • Michael Baker, SBW Consulting, Seattle, WA
  • Justin Spencer, Navigant Consulting, Boulder, CO

IEPEC Host: Sharyn Barata, Itron
DOE Host: Michael Li, U.S. Department of Energy

Read the accompanying paper:
Read the full paper

After registering, you will receive a confirmation email containing information about joining the webinar.

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Billing analysis and engineering models are often seen as competing methods and are used in relative isolation. This paper describes the strengths, weaknesses and best uses of engineering simulation models and billing analysis – both separately and together.

In the Northwest, the Regional Technical Forum (RTF) estimates savings for measures with a heavy emphasis on calculation based on engineering principles using engineering simulation models. The simulation models allow the RTF to vary savings values by climate zone, building construction, and measure specification accounting for much of the variability and savings across program participants.

However, the estimated savings must be calibrated to reality. Therefore, the RTF has used billing analysis to calibrate the simulation models. This webinar describes Northwest’s approach to leveraging these two methods to accurately estimate savings. Recent examples include ductless heat pumps and weatherization. For these measures, the paper will discuss the methodologies that were used to estimate savings and the ways in which billing analysis and engineering simulation models were used together to improve the reliability of the results. We have examples of our successes, but we’ve also found that leveraging the two can be complex, frustrating and sometimes impossible.

Billing analysis and simulation models aren’t a happy couple, but we need them both.

2015 Audio Library is now open.  Hear the sessions you missed.

2015 IEPEC Audio Library

(Also as MP3 files)

username: IEPEC2015
password: IEPEC2015

For efficient use of the files: Each file is a complete recording of each session.  Thus, open the first file, the conference agenda, or refer to your program book to ascertain who the moderator was of the desired topic. Find that session in the listing. If the talk was the third talk, fast forward about 60 minutes. Enjoy!


2017 Conference – Renaissance Harborplace Hotel in Baltimore, Maryland!



Lifetime Achievement Awarded to Ralph Prahl at the 2015 IEPEC Conference

Every two years IEPEC gives a lifetime achievement award to one (or two) deserving individuals. Nominations are provided from the evaluation community. The winner is selected by the IEPEC Board and Planning Committee.

This year, IEPEC is honoring Ralph Prahl of Ralph Prahl and Associates with the 2015 Lifetime Achievement Award. In receiving this award, Ralph is now

recognized as a member of an elite and prestigious group of professional evaluators. As quoted in the submission form:

“More than any other individual in the field, Ralph is responsible for and identified with the concepts of market transformation and market effects.” They point the multiple publications he has co-authored, starting in 1992 with “Are Markets Being Transformed by DSM Programs” and continuing to 2014 with Guidance on Designing and Implementing Energy Efficiency Market Transformation Initiatives.”

His development of the concepts, his clear explication of them, and his central role in operationalizing them in research and program design by themselves merit receipt of this award as is noted in the comments below.

“Few, if any, in the industry can match his understanding of both the big issues, as well as the detailed intricacies of impact, process, and market evaluations across the commercial/industrial and residential sectors and across the full range of technologies and markets. Those who have worked with him are amazed at the number of documents he is able to review carefully and critically, and the number of conference calls he is able to engage in thoughtfully. It is no exaggeration to say that, through his role as reviewer, Ralph Prahl has elevated the quality and incisiveness of evaluations throughout the industry.”


We would like to gratefully thank and acknowledge the following organizations, whose assistance and support are critical in helping to make the 2015 IEPEC conference a success. (Links to sponsor’s websites open in a separate window.) If you are interested in becoming a sponsor of the 2015 Evaluation Conference, please contact the Conference Coordinator, Cara Lee Mahany Braithwait, at 608-231-2552.

Platinum Sponsors


Gold Sponsors

AEG      Nexant_Tagline_Logo_LG_color     epa_logo

Silver Sponsors



Bronze Sponsors

BTan Consulting
Northeast Energy Efficiency Partnerships
Southern California Edison
Wirtshafter Associates, Inc.

Student Scholarships

Alfred P. Sloan Foundation
Yinsight, Inc.