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Generation Resources submit their GADS data into the MISO PowerGADS database through the MISO Market Portal on a quarterly basis.  The deadline to submit is 30 days after the end of the quarter.  For example, the first quarter data from January 1 through March 31 is due by April 30.  The data is locked from editing once the deadline has passed.
 
In addition to reporting to MISO generation resources may be required to report to the North American Electric Reliability Corporation (NERC).  NERC requires generation resources greater than or equal to 20 MW to report their data 45 days after the end of the quarter.  
 
More information on GADS Reporting can be found in the Resource Adequacy Business Practices Manual (BPM-011) and in the North American Electric Reliability Corporation (NERC) Data Reporting Instructions.