Check out this article from Water Online:
Converting Waste Toilet Paper Into Electricity
https://www.wateronline.com/doc/converting-waste-toilet-paper-into-electricity-0001?vm_tId=2024675&user=9fe7ce78-5a0f-4a63-b9d6-676ff1851fb9&utm_source=et_10759433&utm_medium=email&utm_campaign=WOL_09-26-2017&utm_term=9fe7ce78-5a0f-4a63-b9d6-676ff1851fb9&utm_content=Converting+Waste+Toilet+Paper+Into+Electricity
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