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 about GADS, please contact



 GADS News

State of Reliability Analysis of GADS Data: Detailed analysis prepared for the GADS Working Group held in May 2019.

 Data Submission

 Deadlines for Data Submission:
  • GADS Conventional Reporting into WebE-GADS
  • GADS Wind for Wind Turbine Generation Data Reporting Plants with a Total Installed Capacity of 100 MW or Greater in 2019, and 75 MW in 2020.
  • February 15, for the prior year 
  • May 15, for Quarter 1, January 1 – March 31
  • August 15, for Quarter 2, April 1 – June 30
  • November 15, for Quarter 3, July 1 – September 30  
  • February 15, for Quarter 4, October 1 – December 31
  • When a deadline falls on a weekend, reporting will be extended through the following Monday.