可再生天然气(英语:Renewable Natural GasRNG),或永续天然气(英语:Sustainable Natural GasSNG),或生质甲烷(英语:biomethane),是经过升值的生物燃气,与化石天然气品质相当,其甲烷浓度90%以上[1]。生物燃气是取自生物质的气态甲烷。借由升值过程,将品质提升至与天然气相当,可实现以现有气网将气体输送至用户端。可再生天然气是合成天然气或替代天然气英语Substitute natural gas的子领域。

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