493 

 

Energy-smart operational strategies: Energy intensive processes are scheduled during off-peak periods 
to take advantage of lower rates and reduce peak demands on the grid.  Examples include hypochlorite 
generation for Drinking Water Treatment and solids dewatering for Reclaimed Water Treatment. 

Tailored pumping: Most facilities were originally built with single speed pumps, often resulting in 
inefficient operation with frequent stopping and restarting.  These are being replaced with variable 
speed VFD pumps whose rates can be tailored to closely match demand, resulting in more efficient 
operation, fewer starts and stops, and less energy usage. 

Powershare program: Allows the local power utility to operate our emergency generators for peak 
shaving, receiving substantial monetary credits in return.  Credits generally exceed the cost of operation. 

Utilize gravity as free energy wherever possible:  Our main drinking water plant is engineered so that 
virtually all flow within the plant is by gravity, greatly reducing energy used for pumping.  In addition, 
this plant is equipped with two hydroelectric generators driven by “surplus” water in the reservoirs 
beyond what is needed for reservoir maintenance and water supply.  Our main reclaimed water 
treatment plant has a gravity outfall which can accommodate off-peak discharge flows on its own and 
reduce the pumping requirements for peak flows substantially. 

Solar Panels supplement grid power:  At several facilities, we have installed solar panels generating up to 
4 KW of supplemental power.  Smaller installations support such things as sensors and data repeaters, 
while the larger ones alleviate some of the power demand from buildings. 

Alternative fuel vehicles/no idling policy: As conventional vehicles reach the end of their useful life, we 
are, where feasible, replacing them with alternative fuel (biodiesel, ethanol, CG-LPG, electric) and/or 
hybrid vehicles, resulting in cumulative incremental gains in efficiency of energy usage.  Policy prohibits 
unnecessary idling of engines to reduce fuel consumption and emissions. 

Performance Measures & Results 

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Drinking Water Treatment Cost / 1000 Gal: Varies, as it reflects many factors in addition to 
energy savings 

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Reclaimed Water Treatment Cost / MG: Varies, as it reflects many factors in addition to energy 
savings 

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Powershare Savings: Consistently $4-5K per month 

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Reclaimed Water Power Cost: Varies with demand 

 

 

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)  

 

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