Microbial electrochemical technologies (MET) have significant potential to negate the impending energy, and renewable feedstock crisis. METs have evolved into a sustainable and eco-friendly solutions owing to their diverse applications like microbial fuel cell (MFC), for power generation, bioelectrochemical treatment (BET) for wastewater remeduiation, microbial desalination cell (MDC) for salt removal and resource recovery, microbial electrolysis cell (MEC) for the production of Hydrogen by applying external potential and bioelectrochemical syntheis (BES) for value-added products production and other applications such as plant microbial fuel cells (P-MFC) and artificially constructed wetlands fuel cells (CW-MFC) utilize the root exudates for power generation, biosensor applications, etc. This chapter draws light upon the multifaceted application of MET and their specific operational mechanism along with their futuristic integrations and developmental models. © 2017, Springer Nature Singapore Pte Ltd.