42 U.S. Code § 16421 - Third-party finance
In carrying out a Project under subsection (a) or (b), the Secretary may accept and use funds contributed by another entity for the purpose of carrying out the Project.
In carrying out a Project under subsection (a) or (b), any costs of the Project not paid for by contributions from another entity shall be collected through rates charged to customers using the new transmission capability provided by the Project and allocated equitably among these project beneficiaries using the new transmission capability.
Nothing in this section shall constrain or restrict an Administrator in the utilization of other authority delegated to the Administrator of WAPA or SWPA.
Any determination made pursuant to subsections  (a) or (b) shall be based on findings by the Secretary using the best available data.
The Secretary shall not accept and use more than $100,000,000 under subsection (c)(1) for the period encompassing fiscal years 2006 through 2015.
 So in original. Probably should be “subsection”.
The Federal Power Act, referred to in subsecs. (a)(2)(A) and (b)(2)(A), is act June 10, 1920, ch. 285, 41 Stat. 1063, as amended, which is classified generally to chapter 12 (§ 791a et seq.) of Title 16, Conservation. For complete classification of this Act to the Code, see section 791a of Title 16 and Tables.
The National Environmental Policy Act of 1969, referred to in subsec. (d)(1), is Pub. L. 91–190, Jan. 1, 1970, 83 Stat. 852, as amended, which is classified generally to chapter 55 (§ 4321 et seq.) of this title. For complete classification of this Act to the Code, see Short Title note set out under section 4321 of this title and Tables.