Assembly Bill 657 proposes a sales and use tax exemption for specific items utilized exclusively in certified nuclear fusion technology projects in Wisconsin. The bill defines a qualified nuclear fusion technology project as one focused on the controlled fusion of atomic nuclei or related research, and it specifies a comprehensive list of eligible items for the exemption. These items include various advanced technologies and equipment such as data acquisition software, ion cyclotron resonance heating systems, high-voltage power supplies, superconductors, and personal protective equipment, among others.

The bill aims to promote the development of nuclear fusion technology by reducing the financial burden associated with the purchase of necessary equipment and materials. It includes a provision for the Joint Survey Committee on Tax Exemptions to review the exemption due to its implications on state and local tax revenues. The detailed list of exempt items reflects the specialized nature of nuclear fusion projects and underscores the state's commitment to fostering innovation in this emerging field.