In the present work four algae were tested for their biomass production potential in neat livestock wastewater. Chroococcus sp.1 was found to be the best for biomass production under controlled (2.13 g L-1) and outdoor conditions (4.44 g L-1) with >80% of nutrients removal. The produced biomass was then digested with cattle dung as cosubstrate. Interestingly, up to 291.83 +/- 3.904 mL CH4 g(-1) VSfed was produced during codigestion studies (C/N approximate to 13.0/1). In contrast to this, only 202.49 +/- 11.19 and 141.70 +/- 2.57 mL CH4 g(-1) VSfed was recorded with algae (C/N approximate to 9.26/1) and cattle dung (C/N approximate to 31.56/1) alone, respectively. The estimated renewable power generation potential of the investigated coupled process was around 333.79-576.57 kWh d(-1) for a dairy farm with 100 adult cattle. However, further scale-up and testing is needed to make this process a reality. (C) 2014 Elsevier Ltd. All rights reserved.