Apparatus comprises a solar cell arrangement comprising one or more solar cells arranged in a planar structure, the solar cell arrangement having a front surface and a rear surface, the solar cell arrangement being operable to produce electrical power in response to the incidence of light on the front surface. It includes an induction loop arrangement comprising one or more induction loops arranged in a planar structure. The induction loop arrangement is configured to produce electrical power in response to the presence of an electric or electromagnetic field extending through the plane of the induction loop arrangement, and/or is configured to generate an radiate electric or electromagnetic field through the plane of induction loop arrangement in response to being energized with alternating current electrical power. Each solar cell in the arrangement is partly or substantially transparent to electromagnetic fields, and the induction loop arrangement is supported in juxtaposition with the rear surface of the solar cell.