Indication of management commitment (e.g., standard operating procedures; board/executive 
management renewable energy conversion policy, including quantitative goals developed and 
shared with stakeholders)   


Internal energy sources evaluated (e.g., biogas, hydropower, heat in wastewater), and/or 
renewable energy sources evaluated on an ongoing basis (e.g., solar, wind, co-digestion)  


Recovery of digester gas in a combined heat and power (CHP) system, and boilers in place (for 
process and building heating)   


Conversion of digester biogas to electricity and heat, and/or transportation fuel Yes   


Solar panels, wind turbines, heat recovery, in conduit hydro, and/or hydroelectric power 
generation systems installed  

FOG is co-digested with municipal wastewater solids at the Durham Advanced Wastewater Treatment 
Facility. The FOG receiving station at the Durham Facility receives approximately 70,000 gallons of FOG 
per week, producing digester gas that doubles the electricity production of the Durham Facility’s 1.7 
MW cogeneration system.    

Heat recovered from the Durham Facility’s cogeneration engines is used to heat the Facility’s digesters 
and building spaces.  

Clean Water Services is a member of the Hillsboro Sustainability Task Force, a committee which meets 
regularly to discuss and address sustainability issues.  

Performance Measures & Results 



Increased renewable on-site power generation - 21.5 million kWh  



Reduced reliance on the power grid - 37% of electricity is generated on-site  



REC generation - 12 RECs per year generated  



FOG Received- 280,000 gallons per month  



Biogas produced - 15 million cubic feet per month  



Thermal Energy Produced - 2270 MMBtu/month  



Electricity generated on-site - 20 million kWh    




Materials recovery strategy established and communicated with utility employees  


Adequate staffing to support materials recovery program (contractual or in-house)  


Market assessment conducted for recovered materials  


Contracts or agreements in place for materials provision  


Ongoing exploration and evaluation of materials recovery opportunities  



Recovery of phosphorus for beneficial reuse  



Production and marketing or Clean Water Grow retail fertilizer  



Involving private company in new technology for nutrient recovery/sale. 

In 2009, Clean Water Services’ Durham Advanced Wastewater Treatment Facility was the first facility in 
the United States to recover fertilizer using the Ostara struvite recovery system. Clean Water Services 
then opened the world's largest municipal Nutrient Recovery Facility at the Rock Creek Advanced 
Wastewater Treatment Facility on May 8, 2012 in Hillsboro. All of the fertilizer produced at these