This is importance for both governance, whether at federal or state level, and as a mark of progress. Because the Clean Power Plan demands states reduce their carbon emissions, EIA also took on a complementary task of tracking greenhouse gas emissions, principally CO2, from generation and use sectors.
These data might be at risk. They are important. (I use them all the time.) I do not know the size of the dataset. If we run into space issues on the server, I'll copy down sections of interest to me, and keep them locally.