MISSION, Texas—The Trump administration’s border wall now nearly stretches to the riverside retreat where the Cavazos family fishes, barbecues and earns a living on the Rio Grande. To the west, a recently completed stretch of…

Bloom Energy Corp. BE 8.83% became a hot startup more than a decade ago by promising to upset the utility industry with devices that could power the nation’s buildings. Today, it’s a reminder of how…