An alarming shortage of conventional fuels such as petrol & diesel, their increasing demand and adverse effect on environment has led to the exploitation of renewable energy. By now significant role of bio-gas technology on the energy front is well established. Considerable research and dissemination efforts in the field of bio-gas technology have been undertaken all over the world in general and India in particular. The book aims at exploring the production of bio-gas from stable waste (horse dung); scrubbing of biogas and scope of applications of bio-gas in welding and brazing for rural industries. A financial analysis of the proposed pilots scale bio-gas plant from stable waste was also done.The proximate and ultimate analysis of stable waste was done. The production of bio-gas from stable waste was carried out in different type of digesters like batch digester, fixed dome and floating dome digester and associated problems were detected .