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 This website is no longer updated and links to external websites and some internal pages may not work.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

Power Sector Modeling Platform v.5.16

December 29, 2016 — EPA is making available the latest power sector modeling platform, associated data assumptions, and file documentation.

  • Online form - Contact us with questions, comments and feedback regarding v.5.16.

Documentation for v.5.16

To learn more about v.5.16 assumptions, updates and enhancements, see the link below.

National Electric Energy Data System (NEEDS) v.5.16

The National Electric Energy Data System or “NEEDS” database contains the generation unit records used to construct the "model" plants that represent existing and planned/committed units in EPA modeling applications of IPM. NEEDS includes basic geographic, operating, air emissions, and other data on these generating units.

« Return to the Power Sector Modeling main page