First of all, assemble all the required materials properly in order to carry out this project smoothly.
Take two medium potatoes and name them as potato A and potato B.
Grab two galvanized or zinc coated nails and carefully insert them into the two potatoes.
Tuck two medium pieces of copper wires into the two potatoes and place these two potatoes at a suitable distance.
Open the lid of the clock's compartment and gently remove its battery.
Now, use an alligator wire or clip to attach Potato A's copper wire to the positive terminal (+) in the clock unit.
Leave Potato A and go to Potato B. take another alligator wire or clip and connect it to the nail inserted into Potato B. now, connect its other end to the negative terminal (-) in the clock unit.
Pick another large alligator wire or clip and use it to connect the nail in Potato A to the copper wire in Potato B.
Last but not the least; set the clock and enjoy it running on potato power.