NSTAR Commercial

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NSTAR Commercial IndustrialEnergy Efficiency
Programs
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Who is NSTAR?

• Largest investor-owned electric and gas utility
  in Massachusetts
• 1.3 million customers in over 100 eastern
  Massachusetts communities
• Regulated TD businesses
• Boston Edison
• Cambridge electric
• Commonwealth electric
• NSTAR gas (formerly commonwealth gas)

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NSTAR Energy Efficiency Territories
Carlisle
Burlington
Bedford
Acton
Woburn
Stoneham
Lexington
Winchester
Stow
Bolton
Lincoln
Arlington
Maynard
Chelsea
Waltham
Somerville
Sudbury
Hudson
Berlin
Watertown
Cambridge
Weston
West Boylston
Wayland
Marlboro
Boylston
Holden
Newton
Brookline
Framingham
Boston
Northboro
Southboro
Natick
Needham
Shrewsbury
Westboro
Worcester
Ashland
Dedham
Milton
Leicester
Sherborn
Dover
Hopkinton
Westwood
Medfield
Grafton
Auburn
Holliston
Canton
Upton
Millbury
Millis
Walpole
Milford
Medway
Marshfield
Sutton
Sharon
Hopedale
Norfolk
Northbridge
Pembroke
Bellingham
Mendon
Duxbury
Uxbridge
Millville
Kingston
Plympton
Plymouth
Carver
NSTAR Electric
Lakeville
NSTAR Gas
Wareham
Rochester
Freetown
Combined Gas Electric
Marion
Acushnet
New Bedford
Mattapoisett
Fairhaven
Dartmouth
Westport
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EE Programs

• Construction Solutions
• Business Solutions
• Small Business Solutions

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Construction Solutions

• New Construction, Renovation, Equipment
  Replacement
• Financial Incentives Based on Incremental Cost
• Technologies Lighting, HVAC, VSDs, Motors,
  Custom (site specific)

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Business Solutions

• Replacement of existing, functioning but
  inefficient equipment
• Financial Incentives Based on Total Project Cost
  
• Technologies Lighting, Controls, VSDs, Motors,
  HVAC, Custom
• Re-Commissioning

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Small Business Solutions

• Turnkey retrofit services for facilities with
  average monthly demand under 100 kW
• Financial Incentives Based on Total Costs
• Technologies Lighting, Controls, HVAC tune-ups,
  and Refrigeration/cooler controls

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Technical Assistance

• Technical Assistance provided to identify
  potential EE opportunities
• Pay up to 50 of the cost of TA Study at NSTAR
  discretion

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Simple Solutions

• Prescriptive Rebates
• Lighting
• Lighting Controls
• Motors
• Variable Speed Drives
• HVAC Equipment

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Comprehensive Solutions

• Construction Solutions
• Whole Building Approach for New Buildings,
  gt50,000 sqft and 75 tons cooling
• Substantial HVAC, Architectural Lighting System
  Improvements above the code requirements
• Full Engagement of the Design Team prior to
  Construction Documents
• DOE-2 or Appd building energy simulation
• Technical study funding by NSTAR up to 50
• Enhanced Incentives

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Comprehensive Solutions

• Business Solutions
• Target to Replace End of Life HVAC equipment
• Substantial HVAC, Architectural Lighting System
  Improvements above the code requirements
• Properly Size the Equipment
• DOE-2 or Appd building energy simulation
• Technical study funding by NSTAR up to 50
• Enhanced Incentives

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Chiller EE Opportunities
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Custom Chiller Load Reduction Projects

• Reduced ventilation loads using efficient
  exhaust hoods Lab buildings
• Demand controlled ventilation
• Variable speed drives on pumps in Chilled water
  system and air handlers
• Discharge air temperature reset
• Static pressure reset
• Ultrasonic humidification Vs steam humidification

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Proper Chiller Sizing

• Redundancy and over sizing of chillers reduces
  EFLH - Reduces B/C ratio of project
• Non VSD large chiller at part load means lower
  efficiency
• Use different size chillers to match load profile
  and operating hours for optimum energy use

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Proper Chiller Sizing (Continued)

• Oversized chiller means large auxiliaries
  operating at lower efficiency motors, pumps,
  VSDs
• Part load on motors and VSDs mean lower
  operating efficiency

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Combined VSD Motor Part Load Efficiency
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VSD Chillers

• Efficient only if the condenser water is reset to
  reduce the lift
• Efficient only at part load operation. Not
  efficient if run at base load

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Case Study Optimum Dispatching of Chillers

• Location High Tech Company Campus
• Chiller Plant CH1 (600 Tons 0.624
  kW/ton) CH2 (800 Tons 0.611 kW/ton) CH3
  (800 Tons 0.611 kW/ton) CH 4 (1,000 Tons
  0.596 kW/ton) Chill Water Pumps (1) 30 hp, (3)
  40 hp Cond. Water Pumps (1) 30 hp, (3) 40 hp

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Case Study (Continued)
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Non Electric Benefits

• Each ton-hour reduced saved 3 gallons of water
  and 0.3 gallons of sewer discharge
• Reduced chemical costs
• VSDs lower maintenance costs

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Questions ?