42 U.S. Code § 16352 - Cost sharing
Notwithstanding any other provision of law, in carrying out a research, development, demonstration, or commercial application program or activity that is initiated after August 8, 2005, the Secretary shall require cost-sharing in accordance with this section.
Except as provided in paragraphs (2) and (3) and subsection (f), the Secretary shall require not less than 20 percent of the cost of a research or development activity described in subsection (a) to be provided by a non-Federal source.
Paragraph (1) shall not apply to a research or development activity described in subsection (a) that is of a basic or fundamental nature, as determined by the appropriate officer of the Department.
Except as provided in paragraph (2) and subsection (f), the Secretary shall require that not less than 50 percent of the cost of a demonstration or commercial application activity described in subsection (a) to  be provided by a non-Federal source.
The Secretary shall not require repayment of the Federal share of a cost-shared activity under this section as a condition of making an award.
 So in original. The word “to” probably should not appear.
The Stevenson-Wydler Technology Innovation Act of 1980, referred to in subsec. (f)(1), is Pub. L. 96–480, Oct. 21, 1980, 94 Stat. 2311, as amended, which is classified generally to chapter 63 (§ 3701 et seq.) of Title 15, Commerce and Trade. For complete classification of this Act to the Code, see Short Title note set out under section 3701 of Title 15 and Tables.