Biogas has the potential to be one of the most affordable methods to reduce the carbon footprint of India's gas networks. It has received little attention so far due to low production during winter season to its difficult of keeping the optimum operating temperature (37 °C). Moreover, the retention period is also extended to a very large extent in winter period unlike summer due to small yield. Therefore, a pilot-scale self-sustained solar photo-voltaic active thermal heating floating dome biogas plant (35 m3) has been installed at Rajiv Gandhi Institute of Petroleum Technology, Jais, Amethi, India, which is cost effective and provides round year biogas yield. Moisture content (75–80%), volatile matter (78–83%), C/N ratio (16–19), pH (4.2–5.9) of slurry as proximate analyses, while CH4 (58–63%), CO2 (37–42%) of biogas were calculated as ultimate analyses. The integration of semi-transparent photo-voltaic thermal (SPVT) and flat plate collectors (FPC) connected in series with the system allows the conversion of thermal energy into power for force mode operation for slurry heating, which could improve the entire energy efficiency. The evaluation of biogas production efficiency for 12 months shows that the plant produces significant amounts of gas, i.e. 12–13 m3 (November to February) and 15–18 m3 (March to October) due to the circulation of hot water inside the digester, which provides optimum temperature. After digestion, the outlet slurry was used for vermicomposting. The carbon credit earned by present active system without embodied energy is \(\text{\$}\) 17,743.63 for 20 years life of system.