70 

 

improvement project for Irwin Creek WWTP (15MGD) currently  under construction. 
Improvements  to  aeration  system to improve  energy efficiency and reduce GHG, replacement  
of major  basins to  improve hydraulics and reduce pumping needs, Improvements  to process 
control   through   monitoring    and   improved   instrumentation. Future $65 Million  McAlpine 
WWTP (64 MGD) Aeration and Final Clarifier project improvements  that are expected to 
provide significant energy savings potentially  upwards of 10% 

 

Partner  with  Duke Energy to identify  power savings alternatives: Participate in "PowerShare" 
program to voluntarily utilize generators in lieu of power  during extreme high demand power 
events as requested by Duke.  This program has saved Charlotte Water over $500,000/year.  
Participated in Duke Energy Incentive Program for small energy efficiency programs.  Submitted 
over 20 different projects and received rebate savings. 

 

Conduct and participate in energy research activities: Partnership with University of North 
Carolina at Charlotte to complete  research  for  optimization   of  treatment   plants  and engage 
students as interns. Participated in the City wide Energy Efficiency Block Grant program  which 
provided both fellows and interns to identify  internal  energy efficiency projects.  Employee 
R&D group  to  coordinate  research and pilot  projects  including piloting of equipment  such as 
high speed turbo  blowers, instrumentation for monitoring process control, and dewatering 
equipment 

 

Use of Alternative fuels and technologies: Replacement of aging diesel engines in several pieces 
of heavy equipment to reduce nitrogen oxide (NOx) emissions by 7.93 tons over the life of the 
equipment.  Deployment  of hybrid or electric highway vehicles and Installation  of an electric 
vehicle charging station at one Charlotte Water facility and use of smaller electric vehicles for 
transportation on plant sites in lieu of pickup trucks has led to  an estimated  savings of 600-900 
gallons of fuel  per electric vehicle per year over a conventionally fueled vehicle. Participating on 
a City-wide team  evaluating  use of alternative fuels. 

 

Establishment of performance metrics for power consumption and energy use: Individual energy 
efficiency goals have been set at each of the ISO 14001 wastewater treatment plants.  These 
goals will be audited in January 2017.  Performance metrics are tracked quarterly in a dashboard 
on the Charlotte Water intranet as a part continuous improvement.  Data that has been tracked 
for the past several years includes: chemical cost per million gallons of water treated, kWh per 
million gallons of water treated.