<p>This study examines the harvesting of electrical energy from civil structures by means of electrodynamic transducers. First, the equations of motions of the electromechanical system are derived based on the modal properties of the structure. For large-mass civil structures such as bridges or slabs, the mechanical and the electrical domains can be decoupled. This allows the induced voltage in the transducer and the accompanying harvester circuit to be analyzed separately once the vibration response of the mechanical system is obtained. The harvested voltage is investigated experimentally using low-budget electromagnetic transducers (woofer drivers) attached to a cross-laminated timber plate and a rectifier with a smoothing capacitor to verify the derived equations. To accurately predict the harvested voltage across the capacitor, a simulation model in the software Simscape Electrical is used, which models the nonlinear behavior of the rectifier diodes in more detail. A numerical case study of applying electrodynamic energy harvesting to a bridge model based on real measurement data and realistic traffic loads reveals the energy harvesting potential of the considered systems. For transducers with typical properties, however, this potential is limited to low-power applications, such as wireless sensor nodes. To maximize voltage output, custom-made transducers with large transducer constants and low damping should be used.</p>