Great Hunt!
Besides the concept being awesome I really do not see a use for this to be honest since 1 W is pretty much nothing.
One potato produces a stream of 0.8 watts. However, through the process of boiling a potato for 8 minutes and cutting it into four or five pieces you can increase the output by 10 times, leaving you with an output of 8 watts of electricity for about 40 days.
Keep on the good work!