To provide a balloon that includes a photovoltaic means and a solar light concentration device.

A balloon equipped with a photovoltaic means exhibiting an active face intended to receive solar rays and comprising an envelope. The envelope includes at least: a first zone (ZT) transparent to the solar rays; a second reflecting zone (ZR) for the solar rays; a third zone (ZC) comprising the photovoltaic means, the active face of which is directed toward the inside of the envelope; the second and third zones being positioned and cooperating in such a way as to reflect the solar rays in the direction of the third zone.