The Ivanpah Solar Electric Generating System, about 40 miles south of the Las Vegas Strip on Interstate 15. The towers you see (shot from the passenger's seat of a car traveling about 70 mph toward Los Angeles) are each 459 feet high.
The simple version of how the plant works: Each tower is surrounded by an immense field of mirrors that focus sunlight on a collector at the top of the tower. Thus the beams of light made visible by the desert haze. That intense heat drives turbines that generate electricity. (This isn't the first time this type of plant has appeared on this here blog.)