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Electric Reliability Historic Data


Release Date: May 16, 2016
Next Release Date: November 2016


Electricity Reliability Data Shown by NERC Council and Region formats
Net Energy for Load - Historic, Actual and Projected Five-Years
Historic - 1990 through 2004    
Historic - 2005 / 2009    
2003 (with projections)    
2004 (with projections)    
2005 (with projections)    
2006 (with projections)    
2007 (with projections)    
2008 (with projections)    
2009 (with projections)    
2010 (with projections)    
2011 (with projections)    
Noncoincident Peak Load - Historic, Actual and Projected Five-Years
Historic - 1990 through 2004 Summer    
Winter    
Historic - 2005 / 2009 Summer    
Winter    
2003 (with projections) Summer    
Winter    
2004 (with projections) Summer  
Winter    
2005 (with projections) Summer    
Winter    
2006 (with projections) Summer    
Winter    
2007 (with projections) Summer    
Winter    
2008 (with projections) Summer    
Winter    
2009 (with projections) Summer    
Winter    
2010 (with projections) Summer & Winter    
2011 (with projections) Summer & Winter    
Monthly Peak Hour Demand - Historic, Actual and Projected Two-Years
Historic - 1996 through 2004 (Monthly Information)    
Historic - 2005 / 2009    
2003 (with projections)    
2004 (with projections)    
2005 (with projections)    
2006 (with projections)    
2007 (with projections)    
2008 (with projections)    
2010 (with projections) By month    
By assessment area    
2011 (with projections) By month    
By assessment area    
Net Internal Demand, Capacity Resources, and Capacity Margins -
Historic, Actual and Projected Five-Years
Historic - 1990 through 2004    
Historic - 2005 / 2009    
2003 (with projections) Summer    
2004 (with projections) Summer    
2005 (with projections) Summer    
2006 (with projections) Summer    
2007 (with projections) Summer    
2008 (with projections) Summer    
2009 (with projections) Summer    
2010 (with projections) Summer    
Winter    
2011 (with projections) Summer    
Winter    
Aggregated Demand and Supply Components Used for Reliability
Determinations, Actual and Projected Ten-Years
2004 (with projections) Summer    
Winter    
2005 (with projections) Summer    
Winter    
2006 (with projections) Summer    
Winter    
2007 (with projections) Summer    
Winter    
2008 (with projections) Summer    
Winter    
2009 (with projections) Summer    
Winter    
2010 (with projections) Summer    
Winter    
2011 (with projections) Summer    
Winter    
Proposed High Voltage Transmission Line Additions, by Reporting Year
2001 (with projected year of service)    
2002 (with projected year of service)    
2003 (with projected year of service)    
2004 (with projected year of service)    
2005 (with projected year of service)    
2006 (with projected year of service)    
2007 (with projected year of service)    
2008 (with projected year of service)    
2009 (with projected year of service)    
2010 (with projected year of service)    
2011 (with projected year of service)    

Note:

Historical data are shown with the inclusion of the 'old' regional entity names and that information is contained in file marked with the year 2004 or earlier. For the latest reporting, starting in 2005, the current year data are shown in the last row(s) of each file and those data are shown aligned with the updated regional entity names. Each file contains information on the three power grids and/or associated NERC regions. Any revisions to the data will be done within this same format. Data for all historical years are final. Projections for various data elements represent estimates made by industry for reliability planning purposes during the year referenced by the base-year notation found in the table. For data collected on a seasonal basis, summer is defined to cover the period June through September and winter covers December through February. The winter period does overlap the contiguous ending and starting dates for calendar years.

Some files contain both historical and projected data that are related to each other, but only within the year of the filing. For each advancing data year of the files containing both actual and projected data, the earliest projected year period is dropped and a ‘new year’ period added. In all cases, the projected data will change for all years provided within the year covering the filing. Files containing only historical data will be listed in the data sets under an “Actual Only” title.

NERC Regional Entities names that are no longer valid or the council is no longer in existence:

  • Alaska Systems Coordinating Council (ASCC)
  • East Central Area Reliability Coordination Agreement (ECAR)
  • Mid-Atlantic Area Council (MAAC)
  • Mid-America Interconnected Network (MAIN)
  • Mid-Continent Area Power Pool (MAPP)
  • Western System's Coordinating Council (WSCC)

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