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National Renewable Energy Certificate Tracking Systems

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Renewable Energy Certificates (RECs)

National REC Tracking Systems

Currently, nine regional renewable energy certificate (REC) tracking systems operate in different regions of North America, with a set of common purposes. REC tracking systems provide a basis for creating, managing, and retiring RECs, ensuring that each REC is counted only once.1 Tracking systems are also the vehicle through which load-serving entities (LSEs) demonstrate compliance with state renewable energy and related environmental policies, including renewable portfolio standards (RPS).2

Current Regional North American REC Tracking Systems, or Registries
Tracking System Primary Region(s) Launch Date
Texas Renewable Energy Credit Program, run by the Electric Reliability Council of Texas (ERCOT) Texas January 2002
NEPOOL-Generation Information System (GIS) New England July 2002
PJM-Generation Attribute Tracking System (PJM-GATS) Delaware, Indiana, Illinois, Kentucky, Maryland, Michigan, New Jersey, North Carolina, Ohio, Pennsylvania, Tennessee, Virginia, West Virginia and the District of Columbia Sept 2005
Western Renewable Energy Generation Information System (WREGIS) Alberta, Arizona, British Columbia, California, Colorado, Idaho, Montana, Nebraska, Nevada, New Mexico, Oregon, Texas, Utah, Washington, and Wyoming June 2007
Midwest Renewable Energy Tracking System (M-RETS) Illinois, Iowa, Manitoba, Minnesota, Montana, North Dakota, South Dakota, and Wisconsin July 2007
North American Renewables Registry (NARR) States and provinces not covered by the regional markets February 2009
Michigan Renewable Energy Certification System (MIRECS) Michigan October 2009
Nevada Tracks Renewable Energy Credits (NVTREC) Nevada 2007/2008
North Carolina Renewable Energy Tracking System (NC-RETS) North Carolina 2010

Map of National REC Tracking Systems. Click for a text representation of this image.

       For a larger version of this image.


Environmental Tracking Network of North America

Inter-registry transfer capability


Environmental Tracking Network of North America (ETNNA), 2010. The Intersection Between Carbon, RECs, and Tracking: Accounting and Tracking the Carbon Attributes of Renewable Energy. White Paper, February. (PDF 406 KB)

Environmental Tracking Network of North America (ETNNA), 2009. System Changes to Serve a Federal RES. June. (PDF 164 KB)

Environmental Tracking Network of North America (ETNNA), 2009. Inter-registry REC Transfers. June. (PDF 146 KB)



2A renewable portfolio standard requires an electricity supplier to include a required minimum percentage of electricity produced by renewable sources in its mix of electricity supplied to retail customers.

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