Data Reporting Instructions

These Data Reporting Instructions (DRI) were developed to assist utility personnel in reporting information to the North American Electric Reliability Corporation’s (NERC) Generating Availability Data System (GADS). This reporting system, initiated by the electric utility industry in 1982, expands and extends the data collection procedures begun by the industry in 1963. NERC GADS is recognized today as a valuable source of reliability, availability, and maintainability (RAM) information. This information, collected for both total unit and major equipment groups, is used by analysts industry-wide in numerous applications. GADS maintains operating histories on more than 5,000 generating units. As of January 1, 2013, GADS reporting became mandatory for conventional generating units that are 20 MW and larger. GADS is open to any organization (domestic or international) that operates electric generating facilities and is willing to follow the GADS reporting requirements.

The final version of the 2020 GADS DRI is provided below. 

 
  
  
  
2021_GADS_Cause_Codes.xlsx2021 GADS Cause Codes1/1/2021
GADS_DRI_2021.pdf2021 GADS Data Reporting Insructions1/1/2021
Appendix_A_Change_of_Unit_Status_2021_DRI.pdfAppendix A - Change of Unit Status1/1/2021
Appendix_B01_Combined_Cycle_Gas_Turbine_Unit_Cause_Codes_2021_DRI.pdfAppendix B01 - Combined Cycle Gas Turbine Unit Cause Codes1/1/2021
Appendix_B02_Combined_Cycle_Steam_Turbine_Unit_Cause_Codes_2021_DRI.pdfAppendix B02 - Combined Cycle Steam Turbine Unit Cause Codes1/1/2021
Appendix_B03_CoGenerator_Gas_Turbine_Unit_Cause_Codes_2021_DRI.pdfAppendix B03 - CoGenerator Gas Turbine Unit Cause Codes1/1/2021
Appendix_B04_CoGenerator_Steam_Turbine_Unit_Cause_Codes_2021_DRI.pdfAppendix B04 - CoGenerator Steam Turbine Unit Cause Codes1/1/2021
Appendix_B05_CoGenerator_Block_Unit_Cause_Codes_2021_DRI.pdfAppendix B05 - CoGenerator Block Unit Cause Codes1/1/2021
Appendix_B06_Combined_Cycle_Block_Unit_Cause_Codes_2021_DRI.pdfAppendix B06 - Combined Cycle Block Unit Cause Codes1/1/2021
Appendix_B07_Fluidized_Bed_Combustion_Unit_Cause_Codes_2021_DRI.pdfAppendix B07 - Fluidized Bed Combustion Unit Cause Codes1/1/2021
Appendix_B08_Fossil_Steam_Unit_Cause_Codes_2021_DRI.pdfAppendix B08 - Fossil Steam Unit Cause Codes1/1/2021
Appendix_B09_Gas_Turbine_Jet_Engine_Unit_Cause_Codes_2021_DRI.pdfAppendix B09 - Gas Turbine Jet Engine Unit Cause Codes1/1/2021
Appendix_B10_Geothermal_Unit_Cause_Codes_2021_DRI.pdfAppendix B10 - Geothermal Unit Cause Codes1/1/2021
Appendix_B11_Internal_Combustion_Unit_Cause_Codes_2021_DRI.pdfAppendix B11 - Internal Combustion Unit Cause Codes1/1/2021
Appendix_B12_Miscellaneous_Unit_Cause_Codes_2021_DRI.pdfAppendix B12 - Miscellaneous Unit Cause Codes1/1/2021
Appendix_B13_Multi_Boiler_Multi_Turbine_Unit_Cause_Codes_2021_DRI.pdfAppendix B13 - Multi Boiler Multi Turbine Unit Cause Codes1/1/2021
Appendix_B14_Nuclear_Unit_Cause_Codes_ERT_2021_DRI.pdfAppendix B14 - Nuclear Unit Cause Codes1/1/2021
Appendix_B15_Pumped_Storage_Hydro_Unit_Cause_Codes_2021_DRI.pdfAppendix B15 - Pumped Storage Hydro Unit Cause Codes1/1/2021
Appendix_C_Utility_and_Unit_Identification_Codes_2021_DRI.pdfAppendix C - Utility and Unit Identification Codes1/1/2021
Appendix_D_Cause_Code_Cross_Reference_2021_DRI.pdfAppendix D - Cause Code Cross Reference1/1/2021
Appendix_E1_Fossil_Steam_2021_DRI.pdfAppendix E1 - Fossil Steam1/1/2021
Appendix_E2_Fluidized_Bed_2021_DRI.pdfAppendix E2 - Fluidized Bed1/1/2021
Appendix_E3_Nuclear_2021_DRI.pdfAppendix E3 - Nuclear1/1/2021
Appendix_E4_Internal_Combustion_2021_DRI.pdfAppendix E4 - Internal Combustion1/1/2021
Appendix_E5_Hydro_or_Pumped_Storage_2021_DRI.pdfAppendix E5 - Hydro or Pumped Storage1/1/2021
Appendix_E6_Gas_Turbine_Jet_Engine_2021_DRI.pdfAppendix E6 - Gas Turbine or Jet Engine1/1/2021
Appendix_E7_Miscellaneous_2021_DRI.pdfAppendix E7 - Miscellaneous1/1/2021
Appendix_E8_CC_and_Block_2021original.pdfAppendix E8 - Combined Cycle Units and Block Design Data1/1/2021
Appendix_F_Equations_2021_DRI.pdfAppendix F - Equations1/1/2021
Appendix_G _Examples_and_Recommendations_2021_DRI.pdfAppendix G - Examples and Recommendations1/1/2021
Appendix_H_Failure_Mechanism_Codes_2021_DRI.pdfAppendix H - Failure Mechanism Codes1/1/2021
Appendix_I_Data_Release_Guidelines_2021_DRI.pdfAppendix I - Data Release Guidelines1/1/2021
Appendix_J_Cause_Code_Amplification_Codes_2021_DRI.pdfAppendix J - Cause Code Amplification Codes1/1/2021
Appendix_K_Outside_Management_Control_2021_DRI.pdfAppendix K: Outside Management Control1/1/2021
Appendix_L1_Calculating_Combined_Cycle_and_Co-Generation_Block_Data_Using_Synthesis_Event_Performance_Method_2021_DRI.pdfAppendix L1: Calculating Combined Cycle and Co-Generation Block Data Using the Synthesis Event and Performance Method1/1/2021
Appendix_L2_Calculating_Combined_Cycle_and_Co-Generation_Block_Data_Using_Fleet-type_Roll-up_Method_2021_DRI.pdfAppendix L2: Calculating Combined Cycle and Co-Generation Block Data Using Fleet-type Roll-up Method1/1/2021
Appendix_M_Differences_Between_NERC_And_ISO_GADS_Data_Collection_and_Uses_2021_DRI.pdfAppendix M - Differences Between NERC GADS and ISO GADS Data Collection and Uses1/1/2021
Appendix_N_Changes_to_DRI_from_2020_to_2021_DRI.pdfAppendix N - Changes to DRI from 2020 to 20211/1/2021