http://www.biofuelsdigest.com/blog2/2009/03/04/environmental-power-signs-10-year-deal-with-xcel-energy-for-renewable-natural-gas-with-14-mw-dairy-based-project-imminent-in-colorado/ The world's most widely-read biofuels daily Wed, 18 Nov 2009 17:30:24 +0000 http://wordpress.org/?v=2.8.4 hourly 1