Biomass densification is a necessary process for the bio-energy industry. Densities of 224 - 256.3 kg/m³ are needed to minimize transportation costs. Experiments on corn stover densification were completed using an auger compactor. The compaction pressure in the collection tube was varied to establish the pressure's relationship with density and specific energy. Constrained densities of 171 - 343 kg/m³ and unconstrained densities of 131 - 235 kg/m³ were achieved using the system. A power relationship was established between the compaction pressure and the density. A liner relationship was established between the compaction pressure and the specific energy. The minimum bulk densities to optimize transportation fall within the attainable ranges and require less energy than high density processes such as pelletizing and briquetting. Auger compaction appears to be a promising low energy technology for commercial production of densified biomass.