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Reliability Assessments

Reliability Assessment Subcommittee | System Disturbance Reports

NERC regularly publishes reports that assess the reliability of the North American bulk electric system.

  1. Long-Term Reliability Assessments annually assess the adequacy of the bulk electric system in the United States and Canada over a ten-year period. The report projects electricity supply and demand, evaluates transmission system adequacy, and discusses key issues and trends that could affect reliability.

  1. Summer and Winter Assessments assess the adequacy of electricity supplies in the United States and Canada for the upcoming summer and winter peak demand periods.
     

  2. Special Assessments are conducted on a regional, interregional, or interconnection-wide basis as needed.

Reliability Assessments
Survey of Reliability Issues
File Type Size Date Description
Acrobat 276 KB 10/26/07 Results of the 2007 Survey of Reliability Issues (Revision 1)
Long-Term Reliability Assessments
File Type Size Date Description
Acrobat 3,066 KB 10/16/07

2007 Long-Term Reliability Assessment
to ensure the Reliability of the Bulk Power System

Acrobat


Acrobat
1,097 KB


21 KB

10/16/06


11/29/07

2006 Long-Term Reliability Assessment

The Reliability of the Bulk Power Systems in North America

 

Addendum - Table 4: Planned Transmission Circuit Miles – 230 kV and Above

Acrobat 1,331 KB 09/01/05

2005 Long-Term Reliability Assessment

The Reliability of Bulk Electric Systems in North America

Acrobat 1,307 KB 09/09/04

2004 Long-Term Reliability Assessment

The Reliability of Bulk Electric Systems in North America

Acrobat 511 KB 12/23/03

2003 Long-Term Reliability Assessment

The Reliability of Bulk Electric Systems in North America

Acrobat 419 KB 10/10/02

Reliability Assessment 2002-2011

The Reliability of Bulk Electric Systems in North America

Graphs from the Reliability Assessment 2002-2011

Acrobat 477 KB 10/26/01

Reliability Assessment 2001-2010

The Reliability of Bulk Electric Systems in North America

Graphs from the Reliability Assessment 2001-2010

Acrobat 519 KB 11/02/00 Reliability Assessment 2000-2009
The Reliability of Bulk Electric Systems in North America
Graphs from the Reliability Assessment 2000-2009
Acrobat 585 KB 05/23/00 Reliability Assessment 1999-2008
The Reliability of Bulk Electric Systems in North America
Acrobat 1020 KB 10/06/98 Reliability Assessment 1998-2007
The Reliability of Bulk Electric Systems in North America
Acrobat 967 KB 10/06/97 Reliability Assessment 1997-2006
The Reliability of Bulk Electric Systems in North America
Summer Assessments
File Type Size Date Description
Acrobat 10,106 KB 05/14/08 2008 Summer Reliability Assessment
The Reliability of the Bulk Power System in North America
Acrobat 515 KB 05/18/07

2007 Summer Assessment

The Reliability of the Bulk Power System in North America

Acrobat 1,135 KB 05/15/06 2006 Summer Assessment
Reliability of the Bulk Power System in North America
Acrobat 1,358 KB 05/19/05 2005 Summer Assessment (Revised 5/19/05)
Reliability of Bulk Electricity Supply in North America
Acrobat 454 KB 05/11/04

2004 Summer Assessment

Reliability of Bulk Electricity Supply in North America

Acrobat 396 KB 05/15/03

2003 Summer Assessment

Reliability of Bulk Electricity Supply in North America

Acrobat

413 KB

05/15/02

2002 Summer Assessment

Reliability of Bulk Electricity Supply in North America

Acrobat 1079 KB 05/15/01 2001 Summer Assessment
Reliability of Bulk Electricity Supply in North America
Acrobat 343 KB 05/15/01 2001 Summer Special Assessment
(an in-depth independent examination of the expected summer conditions in California and the Pacific Northwest)
Acrobat 350 KB 05/23/00 2000 Summer Assessment
Reliability of Bulk Electricity Supply in North America
Acrobat 544 KB 06/04/99 1999 Summer Assessment
Reliability of Bulk Electricity Supply in North America
Acrobat 1126 KB 05/20/98 1998 Summer Assessment
Reliability of Bulk Electricity Supply in North America
Acrobat 555 KB 05/28/97 1997 Summer Assessment
Reliability of Bulk Electricity Supply in North America
Acrobat 395 KB 05/24/96 1996 Summer Assessment
Reliability of Bulk Electricity Supply
Winter Assessments
File Type Size Date Description
Acrobat 1,156 KB 11/19/07 2007/2008 Winter Assessment
to ensure the Reliability of the Bulk Power System
Acrobat 376 KB 11/16/06 2006/2007 Winter Assessment
The Reliability of the Bulk Electricity System in North America
Acrobat 1,030 KB11/21/05 2005/2006 Winter Assessment
Reliability of Bulk Electricity Supply in North America
Acrobat 1,631 KB11/18/04 2004/2005 Winter Assessment
Reliability of Bulk Electricity Supply in North America
Acrobat 371 KB11/13/03 2003/2004 Winter Assessment
Reliability of Bulk Electricity Supply in North America
Acrobat 298 KB11/15/02 2002/2003 Winter Assessment
Reliability of Bulk Electricity Supply in North America
Acrobat 2,051 KB11/20/01

2001/2002 Winter Assessment

Reliability of Bulk Electricity Supply in North America

Acrobat 523 KB 11/28/00 2000/2001 Winter Assessment
Reliability of Bulk Electricity Supply in North America
Acrobat 465 KB 01/13/00 1999/2000 Winter Assessment
Reliability of Bulk Electricity Supply in North America
Acrobat 351 KB 12/16/98 1998/1999 Winter Assessment
Reliability of Bulk Electricity Supply in North America
Acrobat 396 KB 11/24/97 1997/1998 Winter Assessment
Reliability of Bulk Electricity Supply in North America
Acrobat 373 KB 04/21/97 1996/1997 Winter Assessment
Reliability of Bulk Electricity Supply in North America
Special Assessments
File Type Size Date Description
Acrobat 433 KB 02/11/00 RAS NOx Study - Reliability Impacts of the EPA NOx SIP Call
Acrobat 72 KB 07/07/98 ECAR and MAIN Joint Study 1998 Summer Simultaneous Import Capability Into Illinois and Michigan
Acrobat 39 KB 05/20/98 1998 Special Assessment of MAIN/MAPP
Acrobat 50 KB 05/20/98 1998 Special Assessment of Michigan/Ontario
Acrobat 100 KB 08/18/98 Addendum to 1998 Special Assessment of MAIN/MAPP and Michigan/Ontario July 31, 1998
Acrobat 570 KB 07/16/97 1997 Summer Assessment of New England Power Pool
Acrobat 51 KB 05/09/97 1997 Summer Assessment of MAIN
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