22 U.S.C. § 277d-14
If agreement is concluded pursuant to section 277d-13 of this title for the construction of a major international storage dam the Secretary of State, acting through the United States Commissioner, International Boundary and Water Commission, United States and Mexico, is authorized to conclude with the appropriate official or officials of Mexico an agreement consistent with article 7 of the treaty of February 3, 1944, for the construction, operation, and maintenance on a self-liquidating basis, for the United States share, of facilities for generating hydroelectric energy at said dam.
If agreement for the construction of separate facilities for generating hydroelectric energy is concluded, the United States Commissioner, International Boundary and Water Commission, United States and Mexico, is directed to construct, operate, and maintain such self-liquidating facilities for the United States.
22 U.S.C. § 277d-14