The present invention is a solar panel that generates electricity and extracts heat. A set of such panels may be assembled into a blind. The blind may have a frame that can be retrofit on an existing window. Fluid in the panel is heated by incoming solar radiation, causing it to move, constrained by a one-way valve, in one direction. A Tesla Valve may be used as the one-way valve. The moving fluid may pass through a generator, generating electricity. Heat may be extracted from the fluid by a heat exchanger. The heat may be used to heat a building.