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Greenhouse gas (GHG) emission reduction calculations were performed following four different accounting methodologies for seven New York State on-farm dairy manure-based anaerobic digesters. The four methodologies followed were: Climate Action Registry (CAR), EPA Climate Leaders (EPA), Regional Greenhouse Gas Initiative (RGGI), and Chicago Climate Exchange (CCX). The Power Profiler tool was used to assess the GHG implications of the farms reduced use of traditional fossil fuel-based electricity usage, which was offset with renewable bio-methane derived electricity.