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Currently participating in the U.S. Department of Energy’s “Better Plants” program.  The program 
requires a commitment from participants to reduce energy intensity by 25% over a 10 year period.  
RWRD adopted 2014 as the base year for reporting energy intensity usage and has shown a reduction of 
over 8% thus far in the program. 

Received a $350,000 energy rebate from the local electric utility provider for energy efficient variable 
frequency drives, fine-bubble diffusers, and high efficiency turbo blower installations. 

Commissioned an independent energy audit for our sub-regional wastewater reclamation facilities and 
implemented multiple energy conservation measures as identified in the audit. 

Performance Measures & Results  

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Total Primary Energy Consumed in MMBtu at the regional and 3 sub-regional treatment plants: 
An 8.06% reduction in energy intensity usage from 2014 to 2015. (About a third of the way to 
overall goal of reducing energy intensity by 25% by 2024. 

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Greenhouse Gas Emission Reduction: The 8.06% energy intensity reduction resulted in a 3,893 
metric ton reduction of greenhouse gas emissions. 
 

ENERGY GENERATION & RECOVERY 

 

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  

 

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

*Our utility had CHP recovery for over 30 years at our two largest facilities.  Due to the recent expansion 
of these two facilities, and the required time necessary for air quality permitting, we discontinued the 
CHP.  We continue have boilers in place for process and building heating and are negotiating cleaning 
our biogas to pipeline quality for reintroduction into the grid. 

Pima County Board of Supervisors has a published Action Plan for County Operations.  One major goal is 
to have at least 15% of the electricity consumed by County facilities generated or offset by renewable 
sources.  An additional goal of the Action Plan for County Facilities is for the Wastewater Department’s 
carbon footprint in fiscal year 2018/2019 to be less than or equal to the carbon footprint in fiscal year 
2013/2014. 

Performance Measures & Results 

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Digester biogas beneficial usage: 21,000 MMBtu of digester biogas beneficially used for boiler 
heating per year. 

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Solar electrical power utilization: 12,625 MMBtu of solar electrical energy utilized per year.