Climate and Energy Resources for State, Local and Tribal Governments

AVERT Tutorial: Getting Started – Identify Your AVERT Region(s)

AVERT uses regional data files to estimate displaced emissions. The contiguous 48 states are split into 10 AVERT regions, which are aggregates of EPA’s eGRID subregions. A total of 22 states are split across AVERT boundaries—most across two regions, with the exception of Missouri and Oklahoma, which are split across three AVERT regions, and Texas, which is split across four regions. Consult the map below to determine whether your state is split across AVERT boundaries.


This map of the contiguous 48 states depicts how the states are split into 10 AVERT regions, which are aggregates of EPA’s eGRID subregions.

If you are using AVERT for a state that is split across AVERT boundaries, you might need to run AVERT more than once. For example, if you want to capture the impacts of a statewide EE/RE program in a state that is in multiple AVERT regions, apportion the EE/RE impact based on the proportion of generation in each region (found in the table above), run AVERT for each region, and aggregate the results. EPA recommends doing this for each region that contains more than 5 percent of the state’s generation. To see a demonstration of how this is done, skip ahead to Step 5: Run AVERT for Multiple Regions if Needed.

It is not always necessary to run AVERT more than once, even if your state falls into more than one AVERT region. In the following situations, states that are split across AVERT boundaries only need to run AVERT once:  

  • If you know the exact location of proposed or new EE/RE, and can readily place it all in one AVERT region, run an AVERT displacement calculation for that region only.
  • If you want to capture the impacts of a statewide EE/RE program in a state where more than 95 percent of generation is encompassed by one AVERT region, EPA recommends that you only run AVERT for that region.

For more information and examples, consult the AVERT User Manual (PDF), Appendix G.

The chart below gives each state’s apportionment by AVERT region.

State apportionment by AVERT region, based on generation from 2010 to 2013:

(number of regions)
Northeast Great Lakes / Mid-Atlantic Southeast Lower Midwest Upper Midwest Rocky Mountains Texas Southwest Northwest California
Alabama     100.0%              
Arkansas (2)     88.7% 11.3%            
Arizona               100.0%    
California               0.3%   99.7%
Colorado           100.0%        
Connecticut 100.0%                  
District of Columbia   100.0%                
Delaware   100.0%                
Florida     100.0%              
Georgia     100.0%              
Iowa         100.0%          
Idaho                 100.0%  
Illinois (2)   38.8%     61.2%          
Indiana   100.0%                
Kansas       100.0%            
Kentucky (2)   9.4% 90.6%              
Louisiana (2)     76.1% 23.9%            
Massachusetts 100.0%                  
Maryland   100.0%                
Maine 100.0%                  
Michigan   99.6%     0.4%          
Minnesota         100.0%          
Missouri (3)     21.0% 33.8% 45.2%          
Mississippi (1)     98.9%   1.1%          
Montana (1)         2.3%       97.7%  
North Carolina     100.0%              
North Dakota         100.0%          
Nebraska         100.0%          
New Hampshire 100.0%                  
New Jersey (2) 23.4% 76.6%                
New Mexico (1)       2.9%       97.1%    
Nevada (2)               72.0% 28.0%  
New York 100.0%                  
Ohio   99.7%     0.3%          
Oklahoma (1)     4.1% 92.8%     3.1%      
Oregon                 100.0%  
Pennsylvania   100.0%                
Rhode Island 100.0%                  
South Carolina     100.0%              
South Dakota         99.7% 0.3%        
Tennessee     100.0%              
Texas (3)     6.0% 11.7%     81.6% 0.7%    
Utah (2)                 65.1% 34.9%
Virginia (2)   5.1% 94.9%              
Vermont 100.0%                  
Washington                 100.0%  
Wisconsin (2)   45.2%     54.8%          
West Virginia (2)   87.7% 12.3%              
Wyoming (2)           38.3%     61.7%  
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