Energy Sector

Last Updated in 2012

A renewable energy certificate (REC) is a record that a megawatt-hour of electricity was generated from a renewable source. RECs can generally be used to comply with statewide renewable and alternative portfolio standards: A utility that has not generated enough renewable electricity to meet its target can purchase RECs from a utility that has exceeded its target. RECs can also be purchased to promote sustainability, for example if a municipal government wants to demonstrate that it is supporting renewable energy generators when none are available locally.

Tracking systems manage the creation, registration, use, and retirement of RECs. Tracking systems prevent RECs from being double-counted or used to meet renewable energy standards in more than one region. Several regions and individual states have REC tracking systems, and RECs may be traded or accepted in other regions.

WREGISWestern Renewable Energy Generation Information System
M-RETSMidwest Renewable Energy Tracking System
ERCOTElectric Reliability Council of Texas
PJM GATSPJM Generation Attribute Tracking System
NEPOOL GISNew England Power Pool Generation Information System
MIRECS: Michigan Renewable Energy Certification System
NC-RETS: North Carolina Renewable Energy Tracking System
NYSERDA: New York State Energy Research and Development Authority (Under development)
NVTREC: Nevada Tracks Renewable Energy Credits
NAR: North American Renewables Registry

See where renewable energy resources are located across the United States.

U.S. States & Regions: Renewable & Alternative Energy Portfolio Standards

Read Race to the Top: The Expanding Role of U.S. State Renewable Portfolio Standards, by Barry Rabe (June 2006).