View a user guide for the the National Electric Energy Data System (NEEDS), the database of existing and planned-committed units which are modeled in the EPA Base Case v.4.10. View IPM Base Case v.4.10 for related information.
You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.- NEEDS v.4.10 User Guide (PDF)(11 pp, 180 K)