This paper focuses on applications and electrical valorisation of microbial fuel cells (MFCs), a promisingenergy harvesting technique,suitableas clean power source to supply low power devicesin wireless sensor networks(WSN) for environmental and agricultural monitoring. Additionally,MFC may be used directly as a biosensor to analyse parameters like pH and temperature or arranged in the form of a cluster of devices to be use as a small power plant. We perform a series of test for the electrical valorisationof reactorsas well as bio sensor issues