What is the OpenEEmeter?

The OpenEEmeter is an open source software platform for calculating energy efficiency.

Using the meter, private companies, utilities, and regulators can all calculate the same level of savings for a given set of building efficiency projects.

The OpenEEmeter is...

Open source

The core stack of the OpenEEmeter is released under the MIT License, which means that is it completely open source. The code can be inspected, copied and modified by any party so long as the open license is maintained.


By requiring only project dates and consumption figures, the OpenEEmeter gets rid of the need to clean messy program data in order to get valuable results.


The meter is designed to process huge amounts of data, allowing the efficiency community to measure and calculate energy savings over thousands or even millions of projects.

How does it work?

While it is based on traditional EM&V methods, the OpenEEmeter simplifies the process of calculating energy savings, using three kinds of data input:
  • Location, usually provided as a zip code, or with latitude and longitude coordinates;
  • Dates of the project, from which “before and after” periods are calculated;
  • Energy bills, which show consumption before and after a project.
Using these metrics, the OpenEEmeter splits data into a baseline period before which the project happened, and a reporting period after. Using a regression analysis, the meter then fits consumption to a model of energy usage to estimate the average amount of energy spent for every degree of heating or cooling. Adjusting for weather, the model then calculates the amount of energy saved during the post-project reporting period.
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