The global challenges of climate change, carbon emissions, and resource depletion are serious concern which causes the development of innovative biotechnological solutions at the intersection of microbiology and electrochemistry. This chapter explores two promising technologies: microbial electrosynthesis (MES) and electro-fermentation (EF). These processes employ the capabilities of electroactive microorganisms to convert CO2 into valuable chemicals and fuels, offering a dual benefit of carbon mitigation and sustainable product synthesis. This chapter delves into the applications of MES and EF in the production of useful products, examining their potential to revolutionize chemical manufacturing while contributing to CO2 reduction efforts. We discuss the current challenges facing these technologies and explore future prospects for their development and implementation. By harnessing renewable energy sources, MES and EF present promising pathways toward a more sustainable industrial landscape, addressing both environmental concerns and resource scarcity.