Residents of the U.S. Southwest could one day power their homes with solar energy generated across the border — if a multi-pronged plan from the Mexican government comes to fruition. A 120-megawatt capacity photovoltaic (PV) plant in the Sonoran seaside city of Puerto Peñasco already began feeding the national grid last month, while another 300 megawatts are expected to be online next year. “Who could have told me that a state like Sonora, a net importer of energy that has historically been a net importer, now has the potential to be an energy-exporting state?” Sonora Gov. Alfonso Durazo asked at...