This casebook provides case study synopsis reports of all on-farm animal waste anaerobic digesters (ADs) in New York State (NYS) as of July 2010. Over the past decade in NYS, anaerobic digestion technology has been increasingly implemented as an on-farm manure treatment strategy to reduce odors and environmental pollution and to produce renewable electricity. More recently, the issue of greenhouse gas (GHG) emissions from agriculture have received increased attention and anaerobic digestion is seen as a viable solution to managing methane gas – one of the more potent GHGs.