Energy Use Efficiency Portland Water District Case … Use Efficiency Portland Water District Case Study Joel Anderson, Chief Operator Sebago Lake Water Treatment Facility

Energy Use Efficiency Portland Water District Case Study

Joel Anderson, Chief Operator Sebago Lake Water Treatment Facility

T&D Time of Use Schedules

Transmission & Distribution Time of Use Billing

Electrical Energy Costs

• Constellation Energy – Now based on TOU

• Peak (Weekdays, 7 AM-11 PM): $0.0565/kWh • Off Peak (Weekdays, 11 PM to 7 AM); weekends and

holidays: $0.0419/kWh – 26% power increase during Peak Periods – Forward Capacity Charges (Fixed or “Pass Through”):

Pass through charges based on your facility’s demand during the ISO-NE peak hourly demand

– Using Maine Power Options as a resource – Cost apply to every kWh consumed, not just 15

minute peak demand!

Constellation Energy Bill

Maximizing TOU Operation

Off Peak: $0.0419/kW

Peak: $0.0565/kW

No Demand

Rapid Storage Turnover 25% Cost Savings

Gorham Tank, August 8, 2010

Standish Distribution System

SolarBee

Standish Tank, August 8, 2010

Pax Mixing Unit

Upgrade of Primary Treatment • Replaced 20-year old

inefficient ozone generator • $300,000 grant received

from Efficiency Maine Trust Competitive Program

• UV Reactors programmed to minimize lamp life and power consumption

SLWTF Power Consumption Month kWh Million Gals kWh/MG

Jun-13 389,700 705.289 552.5

Jul-13 342,000 746.576 458.1

Aug-13 396,900 803.842 493.8

Total 1,128,600 2255.707 500.3

Month kWh Million Gals kWh/MG

Jun-14 271,800 766.269 354.7

Jul-14 358,200 824.019 434.7

Aug-14 233,100 764.543 304.9

Total 863,100 2354.831 366.5

kWh kWh/MG

Difference 265,500 133.8 26.7%

Pumping Water • Typically consumes 40% of a facility’s power • One RW Pump vs Two at 18 MGD: 130 kW vs 166 kW • Potential Savings: $19,000 Annually

L:ighting Efficiency Project

• Replace: low efficiency Metal Halide; 1-lamp HO strips,; compact fluorescent; 2 & 4 lamp T12 (magnetic ballasts); High Pressure Sodium

• Install: HIF Fluorescent Lowboy (high ballast factor);2 & 4 lamp F32T8, FO17, & FO25; LEDs

• Total project cost: $33,000 • Efficiency Maine Grant: $8,200 • PWD Cost: $25,800 • Project payback: 3 years • Annual savings: $7,000

Miscellaneous Items • Participation in Demand Response Programs • Heating unused buildings • Chemical costs savings

– Re-evaluating chemicals & chemical dosages – Southern Maine Water Council

• Involve operational staff by showing them the real power costs numbers

• Become of member of Maine Power Options • Set priorities: Meet customer demand, Comply

w/regulations, address water quality, THEN conserve energy cost!