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PowerAPI is a middleware toolkit for building software-defined power meters. Software-defined power meters are configurable software libraries that can estimate the power consumption of software in real-time. PowerAPI supports the acquisition of raw metrics from a wide diversity of sensors (eg., physical meters, processor interfaces, hardware counters, OS counters) and the delivery of power consumptions via different channels (including file system, network, web, graphical). As a middleware toolkit, PowerAPI offers the capability of assembling power meters «à la carte» to accommodate user requirements.


PowerAPI is an open-source project developed by the Spirals project-team, a joint research group between the University of Lille and Inria.

The documentation of the project is available here.

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If you would like to contribute code you can do so through GitHub by forking the repository and sending a pull request.

When submitting code, please make every effort to follow existing conventions and style in order to keep the code as readable as possible.


Use Cases

PowerAPI is used in a variety of projects to address key challenges of GreenIT:

  • SmartWatts is a self-adaptive power meter that can estimate the energy consumption of software containers in real-time.
  • GenPack provides a container scheduling strategy to minimize the energy footprint of cloud infrastructures.
  • VirtualWatts provides process-level power estimation of applications running in virtual machines.
  • Web Energy Archive ranks popular websites based on the energy footpring they imposes to browsers.
  • Greenspector optimises the power consumption of software by identifying potential energy leaks in the source code.


We all stand on the shoulders of giants and get by with a little help from our friends. PowerAPI is written in Python (under PSF license) and built on top of: