All living existence?s need energy for the metabolism and growth. To accomplish this necessity different sources of energy used by diverse organisms. One of the cheapest and easy sources is the renewable/ green sources used by the vast number of organisms for their growth and development. Some soil bacterium uses the atmosphere hydrogen as energy source. Enzymes acts as catalyst in metabolic reactions. This article tells us around the recent study of enzyme activity (Huc) in soil bacterium (Mycobacterium smegmatis) which produce the electric current using hydrogen from the atmosphere.