Welcome to the NWTC Design Codes web site. These computer codes are available in beta-test versions for those who wish to evaluate them. They are research tools that are subject to revision. Please read the explanations and warnings in the introductions before you decide to download a code.

This page is primarily for the benefit of the US Government and organizations that have contracts with the Department of Energy's Wind Energy Program. Others are welcome to use the software, but we do not have the resources to support them.

Before downloading our software, please read the NWTC Design Codes Disclaimer.

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