RNG (Renewable Natural Gas) facilities upgrade raw biogas to pipeline-quality renewable natural gas through purification processes that remove carbon dioxide, moisture, and contaminants while concentrating methane content. These facilities enable waste-to-energy conversion, creating valuable renewable fuel from organic waste.

Facility components include biogas source (landfill gas collection, anaerobic digesters, wastewater treatment), pre-treatment systems removing moisture and particulates, upgrading equipment for CO₂ removal and methane concentration, polishing for trace contaminants meeting gas quality specifications, compression for pipeline injection or vehicle fueling, and interconnection equipment for gas delivery.

Facility scales range from small farm-based digesters producing vehicle fuel locally to large landfill gas facilities injecting into transmission pipelines. Design depends on biogas volume and composition, product destination (pipeline injection versus vehicle fuel), gas quality specifications, and project economics.

Equipment fabrication for RNG facilities includes separators and filters for biogas conditioning, upgrading system vessels and skids (PSA beds, membrane modules, scrubber towers), compression packages, metering and odorization equipment, and interconnection facilities. Modular construction suits many RNG projects enabling factory assembly and testing.

RNG facility development requires understanding regulatory frameworks including renewable fuel standards, interconnection requirements for pipeline injection, environmental permits, and renewable identification number (RIN) generation for carbon credits. Successful projects integrate technical, regulatory, and commercial elements.