William Boston & John Stoll

The coming weeks offer big new showcases for the humble electric-vehicle.
 Auto makers, rushing to meet tightening emissions standards, are unveiling new battery-powered vehicles at the Los Angeles Auto Show this week, mirroring last month’s flood of such cars by European companies. These curtain-raisers will be followed by first shipments of General Motors Co.’s Chevrolet Bolt, a $35,000 Tesla fighter that goes on sale next month.
 What’s missing are consumers, however. Auto makers are suffering from a glut of U.S. sedan and coupe inventory amid strong demand for light-trucks. The coming addition of electric-vehicle capacity could worsen that oversupply if shoppers continue to prefer pickups and sport-utility vehicles to plug-in cars.