Cost-Effective M&V 2.0 (NMEC)

nmecr, an open-source R package we developed, analyzes commercial building energy consumption using a meter-based, whole-building approach for site-specific measurement and verification (M&V) of energy efficiency projects.

The goal of nmecr is to provide a free analysis toolset for M&V using a normalized metered energy consumption (NMEC) approach to increase the cost-effectiveness of verifying project energy savings.

nmecr makes it easier and more cost-effective to analyze the impact of energy saving projects using NMEC approaches
nmecr logo nmec r package kw engineering

nmecr is available for free on GitHub


Using a comprehensive, open-source code library, nmecr offers enhanced NMEC M&V analysis in single package for the first time, and is free for use under the MIT open source license. Features include:

  • Multiple modeling algorithms allows users to develop the best fitting model for their application such as:

    • Lawrence Berkeley National Laboratory’s time-of-week and temperature model
    • Change-point models based on ASHRAE’s inverse modeling toolkit
    • Simple linear regression
    • Heating Degree-Day and Cooling Degree Day algorithms

  • Ability to develop energy models based on hourly, daily, or monthly time intervals
  • Use of additional independent variables to improve model accuracy
  • Supports: prescreening, calculating avoided energy use, and normalized energy savings based on typical weather data.
  • Vignettes provide an overview of the tool, code examples and results. Find a summary of the vignettes here.

By streamlining analysis of energy efficiency projects, we can devote more resources to finding more energy savings in more buildings

Interested in nmecr customization, training or implementation support?


We can help with nmecr installation, customization and training. Utility programs and organizations in these areas currently use nmecr:

Northern California

  • PG&E. NMEC program offerings including Commercial Whole Building and Public Sector Programs
  • LBL. In-house energy efficiency research

Southern California

  • SCE and SoCalGas Partnerships. High opportunity projects and programs (HOPPs) offerings including the public sector Performance-Based Retrofit (PBR) Program
  • SoCalGas. Commercial Restaurant Retrofit (CRR) Program
  • SoCalREN. Energy Efficiency Project Delivery Program for municipal buildings

Featured Project

We provided NMEC M&V analysis using nmecr for two lab projects at the University of California Santa Barbara as part of the HOPPs initiative which was co-funded by SoCalGas and Southern California Edison.

graph nmec-nmec-r-package-mv-amv-nmec-ucsb-lab-electricity-energy-efficiency-sustainability-kw-engineering-consultants

nmecr is available for free on GitHub


Interested in nmecr customization, training or implementation support?