An environmental power generation device may include a base, a turbine mounting structure carried by the base and a wind turbine carried by the turbine mounting structure. The environmental power generation device may also include a power generator in communication with the wind turbine. The power generator may include a rotor in communication with the wind turbine, and a stator in rotational communication with the rotor. The environmental power generation device may further include a solar cell mounting structure connected to the base, and a solar cell connected to the solar cell mounting structure and positioned to overlie the wind turbine.