A solar power plant in Spain tackles the industry's oldest complaint: what happens after dark. The film follows engineers and plant operators explaining how molten salt storage lets the facility keep generating electricity through the night, long after the sun has set. Cameras move through the mirror fields and the central tower, showing how sunlight is concentrated to heat the salt to temperatures high enough to run turbines on demand, not just when light is available. Technicians walk through the control room, describing how the plant balances storage and output to deliver a steady supply rather than the intermittent trickle typical of standard solar arrays. The piece frames this as a turning point for renewable energy, since storage has long been the technology's weak link compared to fossil fuel plants that can run continuously. Short and focused, it stays close to the hardware and the people running it, treating the plant itself as the evidence for whether round-the-clock solar power is actually workable.