Anaerobic digestion (AD) of dairy manure to produce renewable natural gas (RNG) requires large-scale to be economically viable. Centralized AD-to-RNG systems can enable multiple farms to collectively participate. One possible arrangement is to use a central biogas upgrading skid to upgrade biogas from multiple farms. This allows multiple farms with their own AD systems to convert biogas to RNG by sharing the cost of the RNG upgrading equipment and pipeline insertion point. There are several factors to consider when planning a centralized system; many are discussed in this fact sheet from Dairy Environmental Systems.