Abstract: Disclosed are amphibious energy harvesting systems that include a hybrid triboelectric-electromagnetic generator (HTEG). A triboelectric nanogenerator (TENG) is mechanically coupled to an electromagnetic generator (EMG) in a gear-driven transmission configured to enable synchronized energy conversion. A TENG unit comprises a stator and rotor assembly. A stator is paired with a first triboelectric layer configured for soft-contact engagement with a second triboelectric layer paired with a rotor, where the engagement is maintained under compressive force from a sponge element connected to a driving gear. An amphibious turbine is configured to rotate the driving gear, which is mechanically coupled to a driven gear connected to an EMG unit. The turbine is configured for efficient energy harvesting in dynamic, dual-phase fluid environments. Dual generator system of the disclosure offers improved operational adaptability in shifting environmental conditions compared to conventional energy harvesting systems.