The gross average heat value of a cord of dry hard wood (4 ft. x 8 ft. x 16 in.) is estimated at 2,700 kWh. The efficiency of wood heating devices varies greatly (from 40% to 70%); the efficiency of a standard slow-burning wood stove is about 55%. That means that combustion of a complete cord of wood would produce about 1,500 kWh of heat. To generate the same quantity of heat using electricity, it would cost $0.0860/kWh or $129 (plus tax).
The quality of the wood used (kWh/cord) and the efficiency of the heating device are important factors to take into account in your calculation. We recommend you consult a specialist in heating devices, who is better suited to help you make the desired calculations based on your device and the wood you use.