Generating Availability Data System (GADS)

The electric utility industry initiated GADS in 1982 to expand data collection activities that it began in 1963. Today, NERC’s GADS maintains operating histories on more than 5,000 generating units in the North America.

GADS is recognized as a valuable source of reliability information for total unit and major equipment groups and is widely used by industry analysts in a variety of applications. Through GADS, NERC collects information about the performance of electric generating equipment and provides assistance to those researching information on power plant outages. GADs also supports equipment availability analyses and other decision-making processes in the industry. GADS data is also used in conducting assessments of generation resources and improving their performance.

GADS is a mandatory industry program for conventional generating units that are 20 MW and larger. GADS is open to any organization that operates electric generating facilities and is willing to follow the GADS reporting requirements specified in the GADS Data Reporting Instructions (DRI).

For more information, please contact:



 GADS News

Pandemic Cause Code for GADS and GADS Wind Reporting – An addendum to the GADS Conventional and Wind Data Reporting Instructions has been posted. The addendum provides the new pandemic cause code and examples of where work is continuing, but at a slower pace, as well as examples where work has stopped due to the pandemic. The Excel file of Cause and Component Outage Codes has also been updated.

Training – In-person training for 2020 has been postponed. Training materials from the previous session are available under the Training link below.

 Data Submission

Deadlines for Data Submission for GADS Conventional and GADS Wind:

​Reporting Deadline* Period of Operation to Report
February 15 ​Any updates for the prior year
May 15 ​Quarter 1: January 1 - March 31
​August 15 ​Quarter 2: April 1 - June 30
​November 15 ​Quarter 3: July 1 - September 30
​February 15 ​Quarter 4: October 1 - December 31

*When a deadline falls on a weekend, reporting will be extended through the following Monday.

expand Grouping : webE-GADS Application Updates ‎(1)
expand Grouping : GADS Wind Application Updates ‎(1)