Leonardo da Vinci designed a solar furnace that used concentrated sunlight to generate intense heat.
In his studies of mirrors and optics, Leonardo considered arranging reflective surfaces so sunlight would converge on a small target. Concentrating energy in this way can raise the target’s temperature far above that of the surrounding air. He associated such systems with practical work, including heating or melting materials.
Leonardo’s design was not a modern industrial solar furnace with a tower, heliostat field, or computer-controlled mirrors. It was a Renaissance proposal based on the known optical property that concave or suitably arranged reflective surfaces can focus rays. The idea required accurate alignment and bright sunlight, making it difficult to operate consistently.
Solar furnaces became practical much later, after advances in glass, metalworking, optics, and mechanical tracking. Leonardo’s contribution was not a completed power plant but an early engineering application of concentrated solar energy. The concept also belongs to his broader interest in mirrors, lenses, and the behavior of light.