NOVELTY - The roofing product comprises a flexible roofing substrate (110) having a top surface (112) with an exposure area (113), which has receptor zones (120) arranged on the top surface, where each receptor zone is adapted to receive photovoltaic elements and has a different surfacing than the area of the top surface adjacent to the receptor zone. The receptor zones and/or the exposure area have a height of about eight inches. The receptor zone is adapted to receive encapsulated photovoltaic elements. The flexible roofing substrate is a bituminous roofing substrate or an asphalt shingle.    USE - Roofing product useful for photovoltaic roofing- element or system.    ADVANTAGE - The roofing product provides significant fraction of the electrical energy needed for a building's overall function and provides aesthetic benefit.    DETAILED DESCRIPTION - The roofing product comprises a flexible roofing substrate (110) having a top surface (112) with an exposure area (113), which has receptor zones (120) arranged on the top surface, where each receptor zone is adapted to receive photovoltaic elements and has a different surfacing than the area of the top surface adjacent to the receptor zone. The receptor zones and/or the exposure area have a height of about eight inches. The receptor zone is adapted to receive encapsulated photovoltaic elements. The flexible roofing substrate is a bituminous roofing substrate or an asphalt shingle. The surfacing of the receptor zones is uncoated bituminous material and comprises particulate matter, a fabric, a scrim, a woven or nonwoven web, a metal foil or a polymer film, or an adhesive material. The receptor is covered by a releasable liner. The surfacing of the receptor zones is selected so that the appearance of the receptor zone is complementary to the top surface of the flexible roofing substrate in an area adjacent to the receptor zone or complementary to the photovoltaic element with which the roofing substrate is to be used. The surfacing of the receptor zone is stabilized to UV radiation. The top surface of the flexible roofing substrate in the receptor zone is recessed from the top surface of the flexible roofing substrate in the area adjacent to the receptor zone. The top surface of the flexible roofing substrate has solar reflective properties. The surfacing of the receptor zones or the top surface of the flexible roofing substrate in the area adjacent the receptor zones includes alignment marks. The flexible roofing substrate has an exposure area having a height of about eighteen inches. INDEPENDENT CLAIMS are included for:    (1) a photovoltaic roofing element;    (2) a photovoltaic roofing system;    (3) a method for installing a photovoltaic roofing system; and    (4) a kit with photovoltaic elements.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic perspective view of a roofing product.    Flexible roofing substrate (110)    Top surface (112)    Exposure area (113)    Receptor zone (120)    Area. (122)