BES represents a contemporary system that combines microbiological and electrochemical approaches to transform chemical energy from organic substrates into electrical power through microbial generation. Through their three main categories—MFCs and MECs, along with their related derivatives—these systems offer sustainable alternatives for energy development, wastewater processing, environmental surveillance, and competent source recovery. The electron transfer abilities of electrode-active microorganisms form the basis for BES operations, enabling either electricity generation or hydrogen production. The various performance aspects of BES are influenced by microbial species, substrate access, electrode components, systemic design, and environmental conditions, including pH and temperature. BES applications span four major areas: renewable energy generation, environmental cleanup services, water desalination, and biotechnological detection systems. The advancement of electrode materials, synthetic biological procedures, and system integration has enhanced BES capability, overcoming material cost inefficiencies and limitations in power generation. This abstract outlines the core elements and working principles as well as their extensive application in developing sustainable power systems and environmental technologies.