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Electric transmission systems carry large amounts of power at high voltages from generators to substations. Transmission systems must be kept highly reliable to prevent blackouts and ensure robust energy markets. Synchrophasor technology has emerged as key enabler for improving transmission reliability and operations. Phasor measurement units (PMUs), phasor data concentrators (PDCs), wide area communications networks, and advanced transmission applications are building blocks of a smarter and more reliable transmission system. This chart shows number of PMUs deployed as part of the SGIG program and the approximate extent of coverage in the United States resulting from SGIG funding.

SGIG Phasor Measurement Units (PMUs) Installed and Operational

Deployed as of March 31, 2015


** Number of entities reported: 13
Updated on March 13, 2015

The table below includes SGIG program transmission system expenditures.

SGIG Program Electric Transmission Asset Expenditures

Deployed as of December 31, 2014

Updated March 11, 2015

Electric Transmission System Assets


Incurred Cost**

Number of Entities Reporting***





Phasor data concentrators




Transmission lines with dynamic line rating systems




IT hardware, systems, and applications that enable transmission functionalities




Advanced applications




Other transmission related costs




Total transmission installed cost




* In some circumstances, costs were incurred before devices were installed resulting in a reported cost where the quantity is zero.

Projects only reported data on devices they planned to install. Each project installed equipment that best supported their individual goals. Therefore, the number of projects reporting is expected to vary by equipment category. The individual project reporting pages show what equipment that project installed.

** All dollar figures are the total cost, which is the sum of the federal investment and cost share of the recipient (the recipient cost share must be at least 50% of the total overall project cost).

*** In some cases the number of entities reporting was greater than the total number of projects funded by the Recovery Act because some projects had multiple sub-projects that reported data. View list of sub-projects.


The location, information, and data for each smart grid project are provided in this section.
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These reports include analysis, impacts, lessons learned, best practices, analytical tools, and case studies that were supported by the Recovery Act Smart Grid Programs.
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The Department of Energy's Office of Electricity (OE) recognizes that our nation's sustained economic prosperity, quality of life, and global competitiveness depends on an abundance of secure, reliable, and affordable energy resources. OE leads the Department of Energy's efforts to ensure a resilient, and flexible electricity system in the United States. Learn more about OE >>

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