On June 18, 2026, the Ministry of Energy (“SENER”) published in the Official Gazette of the Federation (“DOF”) the Agreement issuing the Guidelines for the voluntary and expedited migration of self-supply and cogeneration of electricity to the figures established under the Electric Sector Law (the “Guidelines”). Likewise, on June 18, 2026, the CNE published in the DOF the Methodology for Determining the Charge for the Electricity Transmission Service (the “Transmission Methodology”), which will become effective on October 19, 2026. The Transmission Methodology repeals the previous methodology that established the so-called “postage stamp wheeling rate” (porteo estampilla) and introduces a new transmission service charge.

On May 28, 2026, two precedents issued by the Plenary of the Superior Chamber of the Federal Court of Administrative Justice (Tribunal Federal de Justicia Administrativa or “TFJA”) were published in the Court’s official journal. These precedents address the tax treatment of capital contributions and dividend distributions.

Mexico and the United States concluded the first formal round of negotiations under the Joint Review of the United States-Mexico-Canada Agreement (USMCA), held on May 28–29, 2026, in Mexico City.