Pilot Summary
Ashland Howe Street Water Treatment
Barnstable Wastewater Treatment Facility
Charles River Pollution Control District
Easton Water Division
Falmouth Wastewater Treatment Facility
Falmouth Long Pond Water Treatment Facility
Greater Lawrence Sanitary District
Lee Water Treatment Facility
Lowell Regional Wastewater Utility
New Bedford Quittacus Water Treatment Facility
Pittsfield Wastewater Treatment Facility
Townsend Water Treatment Facility
Upper Blackstone Water Pollution Abatement District
Worcester Water Treatment Facility

Pilot Summary

In December of 2007, the Executive Office of Energy & Environmental Affairs and MassDEP launched the first innovative phase of the Massachusetts Energy Management Pilot for Drinking Water and Wastewater Treatment Facilities - a project designed to reduce emissions of greenhouse gases and the amount of energy that treatment facilities use in treating the water that flows through the plant by 20%.

MassDEP has taken the lead in this pilot effort and is working in partnership with:

  • Department of Energy Resources (DOER),
  • EPA Region 1 (New England),
  • University of Massachusetts - Amherst (UMass),
  • Massachusetts Renewable Energy Trust,
  • Consortium for Energy Efficiency, and
  • Major gas and electric utilities in the state.

A total of 14 facilities are part of this pilot project, seven wastewater treatment facilities and seven drinking water treatment facilities. So far, the project guided the facilities through the assessment of their current energy performance, conducted energy audits, and assessed renewable energy generation potential. MassDEP and local strategic partners are working together to assist with the implementation of efficiency and renewable energy projects that will result in substantial energy savings for all the targeted facilities. MassDEP is also currently assisting in the identification of funding sources through the State Revolving Fund (SRF) and the Federal Stimulus package to complete the pilot project's findings and recommendations for each of the treatment facilities.

In total, over $3.7 million of potential annual energy savings, through energy efficiency and renewables, were identified at the 14 facilities. Each facility varied in estimated potential savings, from 5%-106% of annual energy costs, an average of 33%.

  • Over 20 million kilowatt hours are expected to be saved through project implementation, and 17,000 tons of annual CO2 reductions in the water sector could be achieved (equivalent to powering 2,400 average sized homes annually)

Once fully implemented, the renewable projects will generate over 7 megawatts of clean energy:

  • 4.62 megawatts of new solar photovoltaic for a 70% increase in the state's solar capacity
  • Up to 2.4 megawatts of new wind power at 2 wastewater treatment plants in Cape Cod
  • 140 kW of new hydroelectric power at 2 drinking water and one wastewater treatment plant
  • 165 kW of Combined Heat & Power (CHP) that will recapture methane biogas from wastewater sludge digestion to optimize on-site electric power generation and heat recovery.

For information on this pilot project, or if you have any questions, contact Michael DiBara, MassDEP project manager, at 508-767-2885 or michael.dibara@state.ma.us.

Map of Energy Management Pilot Project Sites pdf format of Map of Energy Management Pilot Project Sites


Ashland Howe Street Water Treatment

Highlights & Recommendations

  • 62% anticipated annual saving with upgrades
  • Total estimated annual CO2 reductions (efficiency & renewable upgrades): 229 tons
  • 45 kW of green power generation (solar)

Utility Profile
The Town of Ashland operates five (5) groundwater wells at the Howe Street plant on the banks of the Hopkinton Reservoir that annually treats and distributes over 737 million gallons of drinking water for nearly 16,000 customers in the towns of Ashland and Hopkinton. It is the sole public water source for the Town of Ashland. The total water main length is approximately 80 miles. The water system is considered a medium-sized facility.

Annual Energy Use & Costs
In FY 2007, the facility spent $143,641 on energy:

  • Electricity: $121,372 (1,264,176) kWhs)
  • Propane: $22,269 (18,286 therms)
  • Energy use/million gallons of water treated: 1,690 kWhs
  • Electrical costs/million gallons of water treated: $162

Efficiency and Renewable Energy Upgrade Opportunities

  1. Install Variable Speed Drives (VSDs) to five (5) well pumps & high service pumps.
  2. Eliminate compressed air & minimize electric heat in well houses; install capacitors for power factor correction & operate plant during off-peak hours; Install daylight dimming controls & replace LCD computer monitors.
  3. Install a 45 kW solar photovoltaic system onsite (roof and ground-mounted).

 

Efficiency & RenewablesProject CostAnnual Savings ($)Annual Savings (kWhs)
Install VSDs to pumps$106,175$22,391 (18%)119,367
Eliminate compressed air, minimize electric heat, correct power factor, off-peak operation, dimming controls$45,177$44,937 (37%)8,352
45 kW Solar (PV) system$372,000$8,100 (7%)54,000
Totals$523,352$75,428 (62%)194,464

Estimated Annual CO2 Reductions: 149 tons

Strategic Partners
Town of Ashland
Massachusetts Department of Environmental Protection (MassDEP)
Massachusetts Department of Energy Resources (MA DOER)
Massachusetts Renewable Energy Trust
NSTAR Energy Efficiency Program
Lexicon Energy Consulting
EPA New England
Consortium For Energy Efficiency

 

Barnstable Wastewater Treatment Facility

Highlights & Recommendations

  • 100% anticipated annual saving with upgrades
  • Total estimated annual CO2 reductions (efficiency & renewable upgrades): 1,931 tons
  • 1,750 kW of green power generation (solar & wind)

Utility Profile
The Town of Barnstable operates an advanced treatment facility that processes about 1.97 million gallons of wastewater per day. The facility serves approximately 4,000 direct customers and provides septage processing for additional customers.

Annual Energy Use & Costs
In FY 2007, $302, 534 was spent on energy consumption

  • Electricity: $257, 877 (1, 756, 872 kWhs)
  • Natural Gas: $24, 657 (13, 328 therms)
  • Energy use/million gals of water treated: 2,443 kWhs
  • Electrical costs/million gals of water treated: $359

Energy Efficiency Upgrades Underway (2008-2009)

  • Installing Variable Speed Drives (VSDs) and premium motor upgrades
  • High efficiency motor and VSD retrofitting: Grit blower, Plant water & Effluent pumps
  • VSD retrofitting: Chlorine & Hydroxide Recirculation Pump, Sludge & Aeration blowers

Estimated Savings Summary

Efficiency & RenewablesProject CostAnnual Savings ($)Annual Savings (kWhs)
Grit Blower$5,669$1,0136,331
Chlorine & Hydroxide Pumps$6,749$1,3368,352
Aeration Blower$25,318$9,41058,815
Water Pumps$39,815$9,08356,767
Effluent Pumps$22,509$4,31326,944
Sludge Blowers$43,059$9,94361,603
Totals$145,119$35,098 (13.61%)218,812

 

Additional Energy-Saving Recommendations

  • Install 1,000 kW solar photovoltaic system (roof & ground-mounted)
  • Install (3) 250 kW wind turbines onsite

If implemented, the additional estimated annual savings would be about $344,000 per year and approximately 1,771 tons of CO2 emissions would be reduced.

Strategic Partners
Town of Barnstable
Cape Light Compact Energy Efficiency Program
Massachusetts Renewable Energy Trust
EPA New England
Massachusetts Department of Environmental Protection (MassDEP)
Rise Engineering
Consortium for Energy Efficiency
Boreal Renewable Energy Development
Stearns & Wheeler
Zapotec Energy


Charles River Pollution Control District

Highlights & Recommendations

  • 16% anticipated annual saving with upgrades
  • Total estimated annual CO2 reductions (efficiency & renewable upgrades): 418 tons
  • 120 kW of green power generation (solar)  

Utility Profile
The Charles River Pollution Control District operates an advanced nutrient removal treatment facility that can process up to 4.6 million gallons of wastewater per day. The facility treats the combined wastewater and domestic septage from the towns of Bellingham, Franklin, Medway, Millis, Norfolk, Wrentham, Dover and Sherborn.

Annual Energy Use & Costs
In FY 2007, the facility spent $471,280 on energy:

  • Electricity: $454,280 (3,153,600 kWhs)
  • Electrical costs/million gals of water treated: $271
  • Energy use/millions gals of water treated: 1,878 kWhs
  • Fuel Oil: $17,000 (7,600 gallons)

Energy Efficiency & Renewable Upgrade Opportunities & Assessments

  1. Install demand control system & one (1) premium motor; improve plant water systems controls; adopt operational measures; implement heating system improvements.
  2. Install a 120 kW solar photovoltaic system (roof and ground-mounted).

Estimated Savings Summary

Efficiency & RenewablesProject CostAnnual Savings ($)Annual Savings (kWhs)
Retrofitting, controls & operational improvements$53,000$52,000 (11%)402,850
120 kW solar (PV) system$1,020,000$22,000 (5%)144,000
Totals$1,073,000$74,000 (16%)546,850

Estimated Annual CO2 Reductions: 418 tons

Strategic Partners
Charles River Pollution Control District
NSTAR Electric Energy Efficiency Program
Massachusetts Renewable Energy Trust
Massachusetts Department of Environmental Protection (MassDEP)
Massachusetts Department of Energy Resources (MA DOER)
EPA New England
Consortium For Energy Efficiency
Energy New England
EMG Corporation


Easton Water Division

Highlights & Recommendations

  • 6% anticipated annual savings
  • Total estimated annual CO2 reductions (efficiency & renewable upgrades): 46 tons
  • 50 kW of green power generation (solar)

Utility Profile
The Town of Easton operates seven (7) groundwater pumping stations that treats and distributes over 683 million gallons of drinking water for nearly 25,000 customers. The total water main length is approximately 161 miles.

Annual Energy Use & Costs
In FY 2007, the facility spent $145,080 on energy:

  • Electricity: $144,247 (1,171,842 kWhs)
  • Natural Gas: $833 (176 therms)

Renewable Energy Upgrade Opportunities
Install a 50 kW solar photovoltaic system on the operations building and seven (7) pump stations (roof and ground-mounted)

Estimated Savings Summary

Efficiency & RenewablesProject CostAnnual Savings ($)Annual Savings (kWhs)
50 kW solar (PV) system$400,000$9,000 (6%)60,000

Estimated Annual CO2 Reductions: 46 tons

Strategic Partners
Town of Easton
Massachusetts Department of Environmental Protection (MassDEP)
Massachusetts Department of Energy Resources (MA DOER)
Massachusetts Renewable Energy Trust
National Grid Energy Efficiency Program
EPA New England
Consortium for Energy Efficiency


Falmouth Wastewater Treatment Facility

Highlights & Recommendations

  • 100% anticipated annual savings
  • Total estimated annual CO2 reductions (efficiency & renewable upgrades): 3,200 tons
  • 2,160 kW of green power generation (wind & solar)

Utility Profile
The Town of Falmouth operates an advanced, nutrient-removal system that has a capacity of 1.2 million gallons per day, and processes approximately .384 million gallons of wastewater per day. The facility treats combined wastewater, stormwater, and domestic septage for the community.

Annual Energy Use & Costs
In FY 2007, the facility spent $173,283 on electricity (1,120,888 kWhs).

  • Energy use/million gals of water treated: 7,997 kWhs
  • Electrical costs/million gals water treated: $1,236

Renewable Energy Upgrades Underway (2009)

Install a 1.65 Megawatt wind turbine at the wastewater plant.

Efficiency & RenewablesProject CostAnnual Savings ($)Annual Savings (kWhs)
1.65 MW Wind Turbine$4.5-5.0 M$500,000 *4,235,000

* note: the wind turbine will provide 100% of the on-site electricity needed to run the plant. Excess renewable power generation will be sold back to the electric grid.

Estimated Annual CO2 Reductions (energy upgrades underway): 3,200 tons.
Financial Assistance: MA Renewable Energy Trust (Community Wind program) feasibility analysis and long-term Renewable Energy Credit (REC) guarantees.

Additional Energy-Saving Opportunities (under consideration)

  • Install 510 kW solar photovoltaic system (roof and ground-mounted)
  • Reduce water infiltration at pumping stations

If implemented, the additional estimated annual savings would be about $90,000 per year and approximately 468 tons of CO2 emissions would be reduced.

Strategic Partners
Town of Falmouth
Massachusetts Renewable Energy Trust
KEMA, Inc. & Ecology and Environment, Inc.
Cape Light Compact Energy Efficiency
NSTAR Electric
EPA New England
Massachusetts Department of Environmental Protection (MassDEP)
Consortium for Energy Efficiency
Massachusetts Department of Energy Resources (DOER)


Falmouth Long Pond Water Treatment Facility

Highlights & Recommendations

  • 36% anticipated annual savings
  • Total estimated annual CO2 reductions (efficiency & renewable upgrades): 213 tons
  • 15 kW of green power generation (solar)

Utility Profile
The Town of Falmouth operates the Long Pond surface water treatment plant that processes over 1.5 billion gallons of drinking water for over 50% of the town. The Long Pond surface water facility has been the primary water source since the 1890's -- one of the oldest public drinking water facilities in the country.

Annual Energy Use & Costs
In FY 2007, the facility spent $158,052 on energy:

  • Energy use/million gals of water treated: 545 kWhs
  • Electricity:$144,699 (898,472 kWhs)
  • Electrical costs/million gals water treated: $88
  • Natural Gas:$13,353 (7,966 therms)

Energy Efficiency & Renewable Upgrade Opportunities

  1. In 2006 - 2007, four (4) Variable Speed Drives were installed on three (3) 250hp high-lift pumps and one (1) pump station.
  2. Install a 15 kW solar photovoltaic system (roof and ground-mounted).

Estimated Savings Summary

Efficiency & RenewablesProject CostAnnual Savings ($)Annual Savings (kWhs)
VSDs on High-Lift Pumps & Pump Station$123,068$49,000 (34%)260,000
15 kW Solar (PV) system$120,000$2,700 (2%)18,000
Totals$243,068$51,700 (36%)278,200

Estimated Annual CO2 Reductions: 213 tons
Financial Assistance: Cape Light Compact Energy Efficiency Program

Strategic Partners
Town of Falmouth
Cape Light Compact Energy Efficiency Program
Massachusetts Department of Environmental Protection (MassDEP)
Massachusetts Department of Energy Resources (MA DOER)
Massachusetts Renewable Energy Trust
EPA New England
Consortium For Energy Efficiency
National Grid Energy Efficiency Program
Rise Engineering
 

Greater Lawrence Sanitary District

Highlights & Recommendations

  • 45% anticipated annual savings with upgrades
  • Total estimated annual CO2 reductions (efficiency & renewable upgrades): 5,887 tons
  • 410 kW of green power generation (solar & hydro)

Utility Profile
The Greater Lawrence Sanitary District Facility operates a secondary treatment facility, which processes 33 million gallons of wastewater per day. Its Biosolids Drying Facility fully utilizes waste methane digester gas on-site for sludge drying - thereby reducing auxiliary fuel costs by up to $600,000 annually. The facility treats municipal and industrial wastes from Andover, N. Andover, Lawrence, Methuen, and Salem, NH.

Annual Energy Use & Costs
In FY 2007, the facility spent $3,498,154 on energy:

  • Energy use/million gals of water treated:1,731 kWhs
  • Electricity: $3,024,035 (20,846,600 kWhs)
  • Electrical costs/million gals of water treated: $251
  • Natural Gas: $474,119 (368,595 therms)

Energy Efficiency & Renewable Upgrade Opportunities & Assessments

  1. Install Variable Speed Drives (VSDs) to Riverside pumping station and other wastewater motor / pumping systems.
  2. Insulate digesters and perform process maintenance, improve heat recovery system, boiler and temperature control replacements, and Energy Management System.
  3. Implement operational measures, aeration, plant water pumping system and lighting improvements.
  4. Install a 310 kW solar photovoltaic system (roof and ground-mounted).
  5. Install a 100kW hydroelectric turbine to the 60" diameter wastewater outfall pipe.

Estimated Savings Summary

Efficiency & RenewablesProject CostAnnual Savings ($)Annual Savings (kWhs)
Installation of VSDs$1,229,792$307,4202,204,126
Digester & HVAC improvements$427,173$335,32527,204 MMBTU
Operational, aeration, water system, lighting improvements$968,702$817,5082,604,658
310 kW Solar (PV) system$2,480,000$55,800372,000
100 kW hydroelectric turbine$800,000$65,278450,000
Totals$5,905,667$1,581,331 (52%)5,602,064 kWhs,
27,204 MMBTU

Estimated Annual CO2 Reductions: 5,887 tons

Strategic Partners
Greater Lawrence Sanitary District
National Grid Energy Efficiency Program
Massachusetts Renewable Energy Trust
Massachusetts Department of Environmental Protection (MassDEP)
Massachusetts Department of Energy Resources (MA DOER)
EPA New England
Consortium For Energy Efficiency
Process Energy Services
Bay State Gas


Lee Water Treatment Facility

Highlights & Recommendations

  • 106% anticipated annual savings with upgrades
  • Total estimated annual CO2 reductions (efficiency & renewables upgrades): 153 tons
  • 105 kW of green power generation (solar & hydro)

Utility Profile
The Town of Lee operates a surface water treatment plant (Schoolhouse and Leahey Reservoirs) that treats and distributes over 308 million gallons of drinking water for 2,055 customers annually. The facility utilizes a 80kW hydroelectric turbine at the plant that generates nearly 50% of its on-site electric power needs, saving the facility $28,000 annually.

Annual Energy Use & Costs
In FY 2007, the facility spent $42,003 on energy:

  • Energy use/million gals of water treated: 1,373 kWhs
  • Electricity:$32,003 (400,968) kWhs) note:The facility has an 80 kW turbine that reduces the power purchased by over 195,000 kWhs per year.
  • Electrical costs/million gals of water treated: $110
  • Fuel Oil:$10,000 (4,000 gallons)

Renewable Energy Upgrade Opportunities

  1. Install Variable Speed Drives (VSDs), optimize batching, premium motor and lighting upgrades.
  2. Install a 90 kW solar photovoltaic system onsite (roof and ground-mounted).
  3. Install 2nd 15 -45 kW hydroelectric turbine onsite - after water storage tanks and before distribution system.

Estimated Savings Summary

Efficiency & RenewablesProject CostAnnual Savings ($)Annual Savings (kWhs)
VSDs, Motor & Lighting upgrades$21,000$7,900 (25%)27,940
90 kW Solar (PV) system$765,000$16,200 (50%)108,000
15-45 kW hydro turbine$150,000$10,000 (31%)65,000
Totals$936,000$34,100 (106%*)200,940


* note: If energy upgrades are implemented, this plant could be "net zero" - producing 100% of its electric needs through on-site renewable power and maximizing energy efficiency

Estimated Annual CO2 Reductions: 153 tons

Strategic Partners
Town of Lee
Western Massachusetts Electric Energy Efficiency Program
Massachusetts Department of Environmental Protection (MassDEP)
Massachusetts Department of Energy Resources (MA DOER)
Massachusetts Renewable Energy Trust
EPA New England
Energy & Resource Solutions
The Center for Ecological Technology / Precision Decisions
Consortium For Energy Efficiency


Lowell Regional Wastewater Utility

Highlights & Recommendations

  • Green roofs will be used on this facility
  • Total estimated annual CO2 reductions (efficiency & renewables upgrades): 400 tons
  • 90 kW of green power generation (solar & hydro)

Utility Profile
The Lowell Regional Wastewater Plant, an ISO 14001- Environmental Management System - approved facility, operates a secondary treatment facility that processes 31 million gallons of wastewater per day. The facility treats the combined wastewater, stormwater and domestic septage from the City of Lowell and the towns of Chelmsford, Dracut, Tewksbury and Tyngsboro.

Annual Energy Use & Costs
In FY 2007, the facility spent $1,218,435 on energy:

  • Energy use/million gals of water treated: 613 kWhs
  • Electricity: $1,150,866 (6,930,600 kWhs)
  • Electrical costs/million gals of water treated: $102
  • Natural Gas:$67,569 (48,391 therms)

Energy Efficiency & Renewable Upgrade Opportunities & Assessments

  1. Upgrade the existing fine bubble aeration system by installing two (2) new energy-efficient turbo blowers.
  2. Evaluate the technical, financial, and site feasibility of implementing a "sludge to energy" project onsite - utilizing Super Critical Water Oxidation (SCWO) technology.
  3. Install a 90 kW solar photovoltaic system (roof and ground-mounted).
  4. Install 32,000 sq. ft. of green roofs on (5) buildings.

Estimated Savings Summary

Efficiency & RenewablesProject CostAnnual Savings ($)Annual Savings (kWhs)
Aeration system upgrade$463,000$50,000 (4%)6,331
90 kW Solar (PV) system$765,000$16,200 (2%)8,352
Green Roofs$1,000,000TBDTBD

Estimated Annual CO2 Reductions: 400 tons

Financial Assistance: $40,000 feasibility grant "Sludge to Energy" - Massachusetts Renewable Energy Trust (spring 2008)

Strategic Partners
City of Lowell
National Grid Energy Efficiency Program
Massachusetts Renewable Energy Trust
Massachusetts Department of Environmental Protection (MassDEP)
Massachusetts Department of Energy Resources (MA DOER)
EPA New England
Consortium For Energy Efficiency
Camp Dresser & McKee
Woodard & Curran
Process Energy Services


New Bedford Quittacus Water Treatment Facility

Highlights & Recommendations

  • 14% anticipated annual savings with upgrades
  • Total estimated annual CO2 reductions (efficiency & renewable upgrades): 425 tons
  • 350 kW of green power generation (solar)

Utility Profile
The City of New Bedford operates the Quittacus Water Treatment plant that annually processes over 4 billion gallons of drinking water for 93,000 customers. The principal source is Little Quittacas Pond, located in the Town of Rochester. The other ponds are Great Quittacas, Pocksha, Assawompset, and Long Pond situated in the towns of Freetown, Lakeville, and Middleboro.

Annual Energy Use & Costs
In FY 2007, the facility spent $609,002 on energy:

  • Energy use/million gals water treated: 970 kWhs
  • Electricity: $519,880 (4,461,000 kWhs)
  • Electrical costs/million gals of water treated: $113
  • Fuel Oil: $85,230 (44,521 gallons)
  • Propane: $3,892 (1,567 gallons)

Energy Efficiency & Renewable Opportunities & Assessments
Install Variable Speed Drives (VSDs) on two (2) 700hp high-lift and two (2) 200hp low-lift pumps.

Estimated Savings Summary

Efficiency & RenewablesProject CostAnnual Savings ($)Annual Savings (kWhs)
EMS & retro commissioning$95,000$18,000 (21%)1,283 MMBTU
New boiler$45,000$6,935 (8%)500 MMBTU
350 kW Solar (PV) system $297,500$63,000 (12%)420,000 kWh
Totals$3,115,000$87,935 (14%)420,000 kWh, 1,783 MMBTU

Estimated Annual CO2 Reductions: 425 tons

note: The plant is undergoing a major facilities upgrade in 2009 (new roof, skylights, energy-efficient windows and doors etc.) that is expected to drastically improve energy conservation.

Strategic Partners
City of New Bedford
NSTAR Electric Energy Efficiency Program
Massachusetts Department of Environmental Protection (MassDEP)
Massachusetts Department of Energy Resources (MA DOER)
Consortium For Energy Efficiency
EPA New England
American Development Institute
Camp, Dresser, & McKee


Pittsfield Wastewater Treatment Facility

Highlights & Recommendations

  • 89% anticipated annual savings with upgrades
  • Total estimated annual CO2 reductions (efficiency & renewable upgrades): 3,252 tons
  • 1,770 kW of green power generation (solar &CHP)

Utility Profile
The City of Pittsfield operates an advanced, nutrient-removal treatment facility that processes approximately 10.8 million gallons of wastewater per day. The facility treats municipal and industrial wastes from Pittsfield, Dalton, Hinsdale, Lanesborough, and North Lenox.

Annual Energy Use & Costs
In FY 2007, the facility spent $800,115 on energy:

  • Energy use/million gals of water treated: 1,201 kWhs
  • Electricity: $712,299 (4,735,200 kWhs)
  • Electrical costs/million gals water treated: $181
  • Fuel Oil: $87,960 (44,899 gallons)

Energy Efficiency & Renewable Upgrades Underway (2009)

  1. Upgrade the existing single-speed mechanical mixing system to a fine bubble aeration system.
  2. Upgrade the existing anaerobic sludge digestion system by Installing a 195 kW biomass (sludge) cogeneration system for on-site electric power generation (construction anticipated in mid 2009)

Estimated Savings Summary

Efficiency & RenewablesProject CostAnnual Savings ($)Annual Savings (kWhs)
Fine Bubble Aeration$1,700,000$141,000 (20%)919,000
Anaerobic Digestor/Microturbine Upgrade$1,670,000$206,000 (29%)1,373,000
Totals$3,370,000$347,000 (49%)218,812

Estimated Annual CO2 Reductions (energy upgrades underway): 1,752 tons
Financial Assistance: MA Renewable Energy Trust (design & construction grant) $400,000 (12/08)
Additional Energy-Saving Opportunities (under consideration):

  • Install 1,575 kW solar photovoltaic system (roof and ground-mounted)
  • Heating and lighting upgrades

If implemented, the additional estimated annual savings would be about $300,000 (40%) per year and approximately 1,500 tons of CO2 emissions would be reduced.

Strategic Partners
City of Pittsfield
SEA Environmental Consultants
Western Massachusetts Electric Energy Efficiency Program
Massachusetts Department of Environmental Protection (MassDEP)
Massachusetts Department of Energy Resources (MA DOER)
Massachusetts Renewable Energy Trust
University of Massachusetts, Amherst Northeast Combined Heat & Power
EPA New England
Consortium For Energy Efficiency


Townsend Water Treatment Facility

Highlights & Recommendations

  • 40% anticipated annual savings with upgrades
  • Total estimated annual CO2 reductions (efficiency & renewable upgrades): 156 tons
  • 40 kW of green power generation (solar)  

Utility Profile
The Town of Townsend operates (5) groundwater wells, which can treat and distribute over 215 million gallons of drinking water to over 7,200 customers. The total water main length is approximately 50 miles. The water system is considered a small-sized facility.

Annual Energy Use & Costs
In FY 2007, the facility spent $36,315 on energy:

  • Electricity: $33,977 (188,360) kWhs)
  • Natural Gas: $ 2,339 (988 therms)
  • Energy use/million gals water treated: 2, 304 kWhs
  • Electrical costs/million gals of water treated: $416

Renewable Energy Upgrade Recommendations

  1. Install Variable Speed Drives (VSDs), premium motor upgrades, heating and lighting improvements.
  2. Install a 40 kW solar photovoltaic system to operations building and pump stations (roof and ground-mounted).

Estimated Savings Summary

Efficiency & RenewablesProject CostAnnual Savings ($)Annual Savings (kWhs)
VSDs, Premium Motors, Heating & Lighting$45,000$5,000 (15%)25,844
40 kW Solar (PV) System$320,000$8,640 (25%)48,000
Totals$365,000$13,640 (40%)73,844

Estimated Annual CO2 Reductions: 156 tons

Strategic Partners
Town of Townsend
Massachusetts Department of Environmental Protection (MassDEP)
Massachusetts Department of Energy Resources (MA DOER)
Massachusetts Renewable Energy Trust
Unitil Electric & Gas Energy Efficiency Program
EPA New England
Consortium For Energy Efficiency


Upper Blackstone Water Pollution Abatement District

Highlights & Recommendations

  • 5% anticipated annual savings with upgrades
  • Total estimated annual CO2 reductions (efficiency & renewable upgrades): 467 tons
  • 275 Kw of green power generation (solar)  

Utility Profile
The Upper Blackstone Wastewater Treatment Facility operates a secondary treatment facility, which processes 35 million gallons of wastewater per day. The facility treats municipal and industrial wastes from Worcester, Auburn, Cherry Valley Sewer District, Holden, Millbury, Rutland, and West Boylston. The District is undergoing a multi-year, four-phased capital improvement plan to modernize the treatment plant.

Annual Energy Use & Costs
In FY 2007, the facility spent $3,249,400 on energy:

  • Energy use/million gals of water treated: 1,270 kWhs
  • Electricity: $2,035,000 (16,230,200 kWhs)
  • Electrical costs/million gals of water treated: $159
  • Natural Gas: $1,031,000 (62,517,000 therms)
  • Fuel Oil: $180,000(60,000 gallons)
  • Propane: $3,400 (2,000 gallons)

Energy Efficiency & Renewable Upgrade Opportunities & Assessments

  1. Install Variable Speed Drives (VSD), optimize aeration system, install Energy Management System, and replace boilers.
  2. Install a 275 kW solar photovoltaic system (roof and ground-mounted).
  3. Evaluate the technical, financial, and site feasibility of potentially implementing a Fats, Oil, and Grease (FOG) to renewable energy project at the plant.
  4. Evaluate the technical viability of utilizing Combined Heat & Power (CHP) at the plant.

Estimated Savings Summary

Efficiency & RenewablesProject CostAnnual Savings ($)Annual Savings (kWhs)
VSDs, aeration optimization, EMS, new boilers$128,000$60,000 (3%)265,000
275 kW Solar (PV) System$2,337,500$50,000 (2%)330,000
Totals$2,465,500$110,000 (5%)595,000


Estimated Annual CO2 Reductions:467 tons
Financial Assistance: $40,000 feasibility grant "FOG to Biofuel" - Massachusetts Renewable Energy Trust (spring 2008)

Strategic Partners
Upper Blackstone Water Pollution Abatement District
Massachusetts Renewable Energy Trust
Massachusetts Department of Environmental Protection (MassDEP)
Massachusetts Department of Energy Resources (MA DOER)
EPA New England
American Development Institute
National Grid Energy Efficiency Program
Demand Management Institute
Camp, Dresser & McKee
University of Massachusetts Northeast Combined Heat & Power Center
Consortium For Energy Efficiency


Worcester Water Treatment Facility

Highlights & Recommendations

  • 25% anticipated annual savings with upgrades
  • Total estimated annual CO2 reductions (efficiency & renewable upgrades): 423 tons
  • 190 kW of green power generation (solar & hydro)

Utility Profile
The City of Worcester operates the Water Treatment Plant that can process over 11 billion gallons of drinking water for 200,000 customers annually. The treatment plant utilizes a series of ten surface water reservoirs located in Leicester, Paxton, Rutland, Holden, and Princeton. The ten reservoirs combined hold over 7 billion gallons of water.

Annual Energy Use & Costs
In FY 2007, the facility spent $327,695 on energy:

  • Energy use/million gals of water treated: 301 kWhs
  • Electricity: $254,155 (2,526,000 kWhs)
  • Electrical costs/million gals of water treated: $30
  • Natural Gas: $73,540 (55,844 therms)

Renewable Energy Upgrades - feasibility study underway (2009)

Install a 24 40-kW hydroelectric turbine between two reservoir systems.

Estimated Savings Summary

Efficiency & RenewablesProject CostAnnual Savings ($)Annual Savings (kWhs)
40 kW hydropower system$250,000-350,000$34,000 (14%)340,000

Estimated Annual CO2 Reductions (clean energy upgrade): 130 tons
Financial Assistance: $40,000 feasibility grant - Massachusetts Renewable Energy Trust (winter 2008)

Additional Energy-Saving Opportunities (under consideration):

  • Install 150 kW solar photovoltaic system (roof and ground-mounted)
  • Install Energy Management System and perform heating system upgrades
  • Enroll in Demand Response Program (Olean St. pump station)

If implemented, the additional estimated annual savings would be about $45,000 per year and approximately 293 tons of CO2 emissions would be reduced.

Strategic Partners
City of Worcester
Massachusetts Renewable Energy Trust
Massachusetts Department of Environmental Protection (MassDEP)
Massachusetts Department of Energy Resources (MA DOER)
EPA New England
American Development Institute
National Grid - Energy Efficiency Program
GZA Environmental