An official website of the United States government.

This is not the current EPA website. To navigate to the current EPA website, please go to This website is historical material reflecting the EPA website as it existed on January 19, 2021. This website is no longer updated and links to external websites and some internal pages may not work. More information »

Clean Air Markets

Guide for Commenting on NEEDS and IPM

This document is intended to provide guidance on submitting clear, concise, and impactful comments on NEEDS (National Electric Energy Data System), other inputs to the Integrated Planning Model (IPM), or outputs from IPM.

You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.