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  Who we are

We are a research team assembled to investigate how a new technology, micro-synchrophasors, can be used to understand electric power distribution grid stability.

  • California Institute for Energy and Environment
  • Power Standards Lab
  • University of California at Berkeley
  • the Lawrence Berkeley National Lab
  • Individual consultants W. Mack Grady and Ron Hofmann.

Our three-year project started in April 2013, and is funded by the U.S. Department of Energy's ARPA-E (Advanced Research Projects Agency - Energy).

Our project will:

  • develop, test, and certify a micro-PMU: a new, ultra-high-resolution instrument for measuring voltage angles
  • develop a wireless network optimized for power distribution systems
  • deploy a hundred of these instruments at participating utilities
  • investigate diagnostic applications
  • investigate control applications
  • commercialize the results.
Latest news

Micro-PMU project presentations were made at the ISGT Conference in Washington DC on February 20, 2014, and the project was on display at the ARPA-E Summit in National Harbor, Virginia.

A project Review meeting was held on February 10, 2014, at CIEE in Berkeley, California. The first micro-PMU installations, at LBNL's substation and at UC Berkeley, were presented. Memoranda of Understanding with several participating utilities are in place (others in progress) for micro-PMU test installations.

A project Review meeting was held on October 1, 2013, at University of California, Berkeley. The project also participated in the ARPA-E GENI meeting in Virginia on December 10-11, 2013.

A project Update/Review meeting was held on July 9, 2013, at PSL in Alameda, California.

A project kick-off meeting was held on April 8, 2013, at U.C. Berkeley.

Technology update

First installation of micro-PMU's!
The first micro-PMU's were installed 2/2014 at LBNL's Grizzly Peak Substation, and in a lab at U.C. Berkeley's Soda Hall. The two locations are about 3 kilometers apart, and initial measurements show that the voltage phase angle between the locations is approximately 0.25 degrees, most of the time.

PSL demonstrates 0.005 degree resolution for prototype micro-synchrophasor instruments!

For the new micro-synchrophasor instrument based on PSL's PQube®, Power Standards Lab has set one of the lower bounds on short-term phase-angle accuracy at a +/- 0.004 degrees.




  Project contacts:
Alexandra von Meier at and/or
Alex McEachern at


Acknowledgment: The information, data, or work presented herein was funded in part by the Advanced Research Projects Agency-Energy (ARPA-E), U.S. Department of Energy, under Award Number DE-AR0000340. Disclaimer: The information, data, or work presented herein was funded in part by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof.