The market price of 1 kilogram of purified and compressed biogas (often marketed as Bio-CNG or CBG) varies depending on regional government subsidies, local energy tariffs, and production scales, generally tracking competitively alongside traditional commercial automotive fuels or subsidized domestic LPG pricing structures. For home-scale rural biogas systems, the gas is virtually free after the initial capital expenditure of constructing the masonry or prefabricated digester, as it relies entirely on self-generated household and farm organic waste.