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Where We’ve Been and Where We’re Going

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Presentation on theme: "Where We’ve Been and Where We’re Going"— Presentation transcript:

1 Where We’ve Been and Where We’re Going
Utility Lighting Manager’s Summer Summit 2016

2 Outline Why We Do What We Do Tracking Program Accomplishments
Seventh Power Plan Findings News and Goings On What’s Bugging Me Most

3 Why We Do What We Do …after a series of ridiculously expensive power industry missteps, Congress set the PNW on a course that established treating energy efficiency as a resource in power planning – just like generation

4 Pacific Northwest Region The 1980 Regional Power Act
In 1980, the Regional Power Act drew the region together for power planning and fish and wildlife enhancement and recovery on the Columbia River. In simple terms, the Council was created, by Congress, to give the people of the region a voice in the development of power and fish resources of the Columbia River. Of course Congress does not go around willy-nilly giving the people a voice Two big mess up. 1) over-committed to building new thermal generation, bond default, 2x ws rates. 2) We nearly wiped out salmon and steelhead runs in the massive Columbia River Basin. So Congress set up the Northwest Power and Conservation Council to do regional power planning and fish & wildlife recovery. Every five years the Council does a regional power plan Today’s talk springs from the making of the 7thPower Plan. It’s the longest running electric IRP in the country. It’s had a run that surpasses the record of the Broadway musical ‘Cats’, which also debuted in 1981. Scope is Regional (NO Gas). Impact on ETO: Commissions & utilities pay attention to it for resource development recommendations: cons & generation

5 Major Elements of the Northwest Power and Conservation Act of 1980
Authorized States to form Council Directed Council to develop 20-year load forecast and resource plan (“The Plan”) Bonneville is given authority to acquire resources consistent with the Council’s Plan Plan is to provide for the development of the least cost mix of resources Conservation is defined as resource equivalent to generation and given a 10% cost advantage Mandated public involvement in planning process. slide 5

6 Tracking Program Accomplishments

7 Regional Conservation Progress Report
RCP

8 2010-2014 Utility Funded Reported Energy Savings
1309 aMW

9 2010-2014 Reported Energy Savings

10 Lighting Savings Are Largest Contributor
Water Heat Refrigeration Whole Building HVAC Electronics Lighting

11 2014 Energy Savings Results (Reported)
11 48 aMW 262 aMW Total 1.2% of Regional Sales

12 2014 Demand Savings Results (Estimated)
52 MW 250 MW 204 MW 512 MW Total

13 First-Year Utility Cost Levelized Utility Cost
Cost Data Cost Data on 75% First-Year Utility Cost First-Year Total Cost Incentives + Admin cost Incremental cost + Admin cost $/kWh and million $/aMW $/kWh and million $/aMW Levelized Utility Cost Levelized Total Cost Incentives + Admin cost Weighted average measure life Discount Rate (5%) Incremental + Admin cost Weighted average measure life Discount Rate (5%) $/kWh $/kWh

14 2014 Sector Results with Measure-Level Detail http://rtf. nwcouncil
Over 185,000 records

15 2014 Residential Results Residential Energy Residential Demand
Check Electronics – TV load shape 118 aMW Total 250 MW Total

16 Top Residential Measure Categories
Measure Category 2014 aMW Percent of Residential Total Levelized Utility Cost Lighting 39.7 34% $0.036 Televisions 34.1 29% - Behavioral 5.9 5% $0.057 Showerheads 5.3 $0.019 Ductless Heat Pumps 4.7 4% $0.032 New Homes* 4.3 Clothes Washers 3.2 3% $0.069 Windows 2.9 2% $0.026 Refrigerators 2.7 $0.061 Insulation 2.1 Air-Source Heat Pumps 2.0 $0.033 Duct Sealing $0.031 Remove cost columns and add in Planning column & percentage of total res savings Good to show percent of measures that are planning vs. proven Cost data – appropriate at the measure level or sector level? What are the top things that we’re seeing at the measure level? Include costs at that level (first year or levelized) (Different Slide) Highlight the four cost metrics that we’ve created. Don’t make it too busy. What are the costs that are reported? What’s in Utility vs. Total? Include a slide. Slide on Units Data? Ex. How much of a market are we touching? Next Slide – Planning vs Proven * Includes NEEA savings from residential state energy codes

17 Residential NEEA & Utility Acquisition
NEEA Residential Savings Televisions (34 aMW) ENERGY STAR Homes (4 aMW) Clothes Washers (2 aMW) Lighting (2 aMW) Refrigerators (2 aMW) Ductless Heat Pumps (0.5 aMW) Dishwashers (0.5 aMW) HPWHs (0.25 aMW)

18 HVAC demand still under investigation
Commercial Results 2014 Energy Results (aMW) 2014 Demand Estimates (MW) Splitting apart lighting: what do we know there? i.e. Solid-state, exterior. Double check HVAC aMW to MW Another slice in these pies: NEEA vs. Utility acquisition CAVEAT: HVAC demand still under investigation 85 aMW Total 204 MW Total

19 2014 Commercial Lighting Details
Fully two-thirds of savings claimed are LED CAVEAT Distribution of lighting technologies from data with measure details SHOULD NOT be considered representative of the savings WITHOUT details

20 Commercial Energy Savings
2014 NEEA Commercial Savings Com Desktops (8 aMW) Commissioning & Retro-Commissioning (7 aMW) Com Energy Codes (4 aMW) Building Operator Certification (2 aMW) Com Real Estate SEM; Health Care SEM (0.7 aMW) Low Wattage T8s (0.4 aMW)

21 Commercial Measure Costs 2014

22 Over $100 Million in Lighting Incentives Reported and $350 Million in Lighting Costs Only ~75% of savings reported costs

23 Utility Cost Fractions Vary by Program Category

24 Trends in Program-Claimed Lighting Controls Savings

25 Industrial Results 2014 Energy Results (aMW)
2014 Demand Estimates (MW) Is there an energy management component to motors/drives, process loads, compressed air Ryan: agricultural – be interesting to know about SIS. Decimal places comment from the peanut gallery… Trend of Industrial Energy Management Capital investments vs behavior 48 aMW Total 52 MW Total

26 Energy Management vs. Capital
Strategic Energy Management Custom O&M Track & Tune Energy Project Management HP Energy Management Industrial System Optimization Capital Projects Lighting HVAC Equipment Compressed Air Refrigeration

27 2014 Agricultural Energy Results
Is there an energy management component to motors/drives, process loads, compressed air Ryan: agricultural – be interesting to know about SIS. Decimal places comment from the peanut gallery… Trend of Industrial Energy Management Capital investments vs behavior 11 aMW Total

28 You can manipulate these data yourself – go here:

29 2014 Irrigation Results Irrigation Results
Irrigation accounts for 83% of Ag savings Scientific Irrigation Scheduling Hardware and Equipment 25% of irrigation savings is unknown Request for more detailed data Is there an energy management component to motors/drives, process loads, compressed air Ryan: agricultural – be interesting to know about SIS. Decimal places comment from the peanut gallery… Trend of Industrial Energy Management Capital investments vs behavior

30 2014 is First Year Since 2005 that Utility-Funded Savings Alone Fell Short of Annual Targets

31 The Result Has Been Mr. Toad’s Wild Ride!
Northwest Efficiency Development Has Historically Been Tied To Current Market Conditions The Result Has Been Mr. Toad’s Wild Ride! Enlightenment? Response to West Coast Energy Crisis Short Term Memory Loss? Response to “Restructuring Discussions” and surplus Response to PNW Recession

32 Seventh Power Plan: Key Findings and Resource Strategy

33 Forecast Load Growth Over The Next Two Decades (Average Over 800 Futures)

34 Seventh Power Plan Least Cost Resource Strategies for Meeting Forecast Energy and Capacity Needs
Key Finding: Energy Efficiency and Demand Response can meet nearly all growth in energy and capacity needs through 2035

35 Cost-Effective Energy Efficiency and Demand Response can meet nearly all growth in energy and capacity needs through 2035

36 Region Has a System Adequacy Problem
LOLP (%) Heat Map for 2021 Imports 3400 2500 1700 Loads High 22 24 26 Med 8 10 12 (Existing MW planned DR + standby generators Low 2 4 6

37 Conservation Can Provide Capacity Benefits
Depending on WHEN a measure saves energy Key Finding: Surprise inside! It’s like a two-fer. Buy one get one free.

38 What Does 7P Suggest for EE Programs & Evaluators & Engineers ?
Steady as she goes Lots of low-cost potential & challenges to acquire it Spot market price is NOT the avoided cost for least-cost Expand thinking beyond annual energy savings to kW Need hourly savings profiles Integration with DR programs Baselines changing – programs adjust Be smart & strategic about programs Importance of EE research & performance Hourly savings profiles important

39 7P: New EE Goals & New Baselines
Conservation Energy Milestones by Fiscal Year in Average Megawatts From around 200 aMW to over 300 aMW per year – from all sources

40 But What If We Don’t Need Energy or Capacity Today?
Plan Findings Underlying load growth Loss of existing generation A steady EE build - 0ffsetting long-term net growth is least-cost and low-risk Incremental sustained progress at low cost accumulates high value Patient capital investment

41 Lots of EE Between Spot Market Price & Cost of New Generation
Gas CCCT Spot Market Between Spot Market Price of Electricity and Cost of New Gas Plant About 1000 aMW of Energy About 2000 MW of winter peak

42 Spot Market Price Is Not The Least-Cost Avoided Cost For EE
System costs and risk both increase by about 15 percent if spot market price is used as avoided cost Plan Findings Building about twice the EE than would be built with spot market as avoided cost And reduces long-term system cost & risk & revenue requirements Spot market price is not the least-cost avoided cost for EE With spot market price as avoided cost for EE develop only 700 aMW by 2021 about 50% of least-cost development

43 And There Are New Measures
About 30 new measures Nearly half of potential Key new technology SSL & Controls ~50% HVAC ~25% Electronics ~15% Plug loads Behavioral New applications of old And each market is different: Some fast, some slow, changing players, market dynamics, consumer uptake Each will need tailored approach/strategy/clever intervention: Will need regional coordination to move forward. (e.g. Regional Strategic Market Planning effort would help get some of these off the ground) Agriculture Irrigation Efficiency Lighting Commercial Advanced Rooftop Controller Bi-Level Stairwell Lighting Compressed Air DCV Parking Garage DHP Exterior Building Lighting LEC Exit Sign Lighting Controls Interior Low Power LF Lamps LPD Package MotorsRewind Secondary Glazing Systems Smart Plug Power Strips VRF Water Cooler Controls WEPT WHTanks Industrial Residential Advanced Power Strips Aerator ASHP Behavior Clothes Dryer DHP Ducted EV Supply Equip Lighting PPA WIFI enabled tstats

44 Incorporate Value of Deferred Generation Capacity in B/C
Energy Deferred Capacity Avoided Annual O&M Avoided Other fuel Non-Electric Benefit Avoided Periodic Replacement Risk Avoidance Capital Program Admin Annual O&M Other fuel Non-Electric Cost Periodic Replacement Benefits Costs

45 What Does Revised Cost-Effectiveness Mean?
Will credit more value to measures that provide peak capacity reduction And less to those that don’t

46 Avoided Cost to Beat Based on Hourly Profile of Savings for Select Measures - Winter Peak

47 Lighting Savings in Buildings

48 News & Goings On

49 News & Goings On Lighting Market Analysis & Simulation
Help for Program Planners RTF Takes on Momentum Savings Market Analysis Subcommittee Litmus Test Regional Strategic Approaches Mid-Stream New HVAC Interaction Factors! And “calibrated” simulation models

50 What’s Bugging me most

51 What’s Bugging Me Most Evaluating Elusive Intangibles:
Design & Application, Glare, Flicker, Color Avoiding The Seductive Power of Easy Target Chasing vs Resource Development & Better Lighting Strategy Needed – Think Long Game TLED vs Integrated Fixtures Corralling Controls Integrate analysis Parsing out the hype Getting some empirical data

52 Lighting Insights Ingredients: Design, SSL, Controls
Too many technology options appearing too fast to be prescriptive in programs Reduce Power and Hours Pace: Will new technology increase turnover? ‘Smart’ confounded & conflated with NEB Significant market momentum, new market players, little stability

53 End

54 Cost-Effective Savings in All Sectors
100 Measures

55 What’s New? About 3o new measures Nearly half of potential
Key new technology SSL & Controls ~50% HVAC ~25% Electronics ~15% Plug loads Behavioral New applications of old And each market is different: Some fast, some slow, changing players, market dynamics, consumer uptake Each will need tailored approach/strategy/clever intervention: Will need regional coordination to move forward. (e.g. Regional Strategic Market Planning effort would help get some of these off the ground) Agriculture Irrigation Efficiency Lighting Commercial Advanced Rooftop Controller Bi-Level Stairwell Lighting Compressed Air DCV Parking Garage DHP Exterior Building Lighting LEC Exit Sign Lighting Controls Interior Low Power LF Lamps LPD Package MotorsRewind Secondary Glazing Systems Smart Plug Power Strips VRF Water Cooler Controls WEPT WHTanks Industrial Residential Advanced Power Strips Aerator ASHP Behavior Clothes Dryer DHP Ducted EV Supply Equip Lighting PPA WIFI enabled tstats

56 Commercial sector Efficiency

57 Results: Cost-effective 20-year Potential (aMW)
Commercial End-Use Category 1,686 (aMW in 2035) Compressed Air 4 Electronics 345 Food Preparation 64 HVAC 423 Lighting 687 Motors/Drives 39 Process Loads 49 Refrigeration 70 Water Heating 6

58 Commercial Measures Cost-Effective Potential (aMW)
End-Use and Measure 2021 2026 2035 Compressed Air 1 2 4 Electronics 75 272 345 Data Centers 55 230 261 Desktop 13 28 56 Laptop Monitor 6 12 24 Food Preparation 23 64 Cooking Equipment 63 Pre-Rinse Spray Valve HVAC 135 296 423 Advanced Rooftop Controller 22 84 119 Commercial EM 44 62 69 DCV Parking Garage 8 DCV Restaurant Hood Demand Control Ventilation 11 16 DHP 43 60 Economizer 19 26 27 Premium Fume Hood Secondary Glazing Systems 7 15 VRF 80 WEPT 5 10 End-Use and Measure 2021 2026 2035 Lighting 244 479 687 Bi-Level Stairwell Lighting 2 4 10 Exterior Building Lighting 59 126 142 LEC Exit Sign 9 19 Lighting Controls Interior 6 13 Low Power LF Lamps 15 40 LPD Package 229 393 Parking Lighting 8 Street and Roadway Lighting 30 57 61 Motors/Drives 7 18 39 ECM-VAV 5 14 34 MotorsRewind Process Loads 20 44 49 Municipal Sewage Treatment 32 35 Municipal Water Supply Refrigeration 63 70 Grocery Refrigeration Bundle 37 52 Water Cooler Controls 11 Water Heating 3 Showerheads WHTanks 1 Total 530 1,203 1,686

59 Savings from “New” Measures
What’s New? Savings from “New” Measures Measure Bundle 2021 2026 2035 Advanced Rooftop Controller 22 84 119 Bi-Level Stairwell Lighting 2 4 10 Compressed Air 1 Data Centers 55 230 261 DHP 12 43 60 Exterior Building Lighting 59 126 142 LPD Package 229 393 Motors Rewind 5 Secondary Glazing Systems 7 15 Showerheads 3 VRF 6 27 80 Water Cooler Controls 11 13 WHTanks Low Power LF Lamps 40 Lighting Controls Interior LEC Exit Sign 9 19 WEPT Will need regional coordination to move forward. E.g. Regional Strategic Market Planning effort would help get some of these off the ground Some emerging tech, some just new to 7P Some research may be needed

60 New or Emerging Measures
Solid State Lighting Embedded Data Centers VRF ARC Smart Plug Power Strip Energy Management Not really new potential, but has a new name since 6P Emerging programs such as SEM

61 Solid State Lighting

62 Notable Changes Federal Standards Step Up LED making inroads by 2016
HID fading Previous lighting momentum savings: Gone Cost of savings a big factor Capacity value of savings a big factor Baseline Step Up 9 Federal lighting standards since 6P All states have more stringent codes Market snap shot at end of 2015 LED making inroads, HID fading Momentum savings Previous momentum savings: Gone Gone Gone New momentum savings ? ? ?

63 Standards will Reduce Baseline LPD in Existing Stock by about 14%
Before Standards w/sf After Standards .86 w/sf After all cost-effective measures

64 LED sales forecast also reduces remaining conservation potential
Assume 3% to 40% of all new sales are LED Reduces load forecast

65 Commercial Lighting Measures Total Achievable Potential Available by Year (aMW)
TRC Lvl Cost ($/MWh) Lighting 196 448 711 $17 Interior LPD Package (n ~40) 102 208 391 $13 Low Power LF Lamps 11 35 40 $24 Lighting Controls Interior 5 14 37 $130 Exterior Building Lighting 46 118 142 $12 Street and Roadway Lighting 24 53 61 $-34 Parking Lighting 8 $25 Bi-Level Stairwell Lighting 1 4 $79 LEC Exit Sign 3 19 Total of about 900 individual ‘measures’ A coal plant worth of energy savings by 2025 Mostly cost-effective: Exception Lighting Controls Interior

66 Lighting Savings in Buildings

67 Using Forecast 2017 Cost & Performance for LED

68 7P Lighting Proxy Measures Linear Fluorescent Measures (New & NR)
Application Measure TRC Lvl Cost ($/MWh) Savings (% Delta Watt) New New LED Fixture $49 37% NR LED Fixture or Kit $51 LED Fixture or Kit with Redux Lumens $12 50% High Efficiency Fluor Fixture $6 33% Tube LED Direct Line Voltage $35 23% Tube LED Direct Line Voltage Redux Lumens $4 38% Low Watt Fluorescent Lamp (28W & 25W) $24 6%

69 7P Lighting Proxy Measures Linear Fluorescent Measures (Retrofit)
Application Measure TRC Lvl Cost ($/MWh) Savings (% Delta Watt) Retro LED Fixture or Kit $189 37% LED Fixture or Kit with Redux Lumens $116 50% High Efficiency Fluor Fixture with Redux Lumens $82 33% Lamp Only - Tube LED Over Ballast $196 15% Lamp Only - Tube LED Over Ballast Redux Lumens $68 32%

70 7P Lighting Proxy Measures Recessed Can Measures
Application Measure TRC Lvl Cost ($/MWh) Savings (% Delta Watt) New New LED Fixture (Halogen Base) $ (80) 90% New LED Fixture (CFL Base) $ (19) 63% NR $(78) $ (12) Retro $ (56) $ 82 Lamp Only – (Halogen Base) $(71) 89% Lamp Only – (CFL Base) $ 5 59%

71 7P Lighting Proxy Measures Plus Many Many More
Application Measure Bundle Number of Measures TRC Lvl Cost ($/MWh) Savings (% Delta Watt) All Display Track 10 ($30) -$110 17% - 60% High Bay 8 $2 - $86 37% - 66% Omni Directional 3 ($100) - ($7) 37% - 84% Exterior Façade 4 ($15) - ($20) 60% - 80% Exterior Parking Lot 6 ($3) - $7 Exterior Area Lighting ($40) – ($18) Parking Garage $30 - $80 70% – 80% Street & Roadway ($100) - $20 50% - 70% 798 permutations indoor

72 Exit Signs Too! 40 watts 4 watts 0.4 watts
Two orders of magnitude in my career About 4 million of these in PNW LEC Light Emitting Capacitor: Better than LED exit sign 4 watts 0.4 watts

73 Lighting Insights Ingredients: Design, SSL, Controls
Too many technology options appearing too fast to be prescriptive in programs Reduce Power and Hours Pace: Will new technology increase turnover? ‘Smart’ confounded & conflated with NEB Significant market momentum, new market players, little stability

74 Embedded Data Centers Data Centers within Commercial Buildings Exclude Dedicated DC Buildings Over 4 kWh/sf in office buildings with data centers Over 2 kWh/sf in Offices

75 Embedded Data Center Savings 261 aMW
Total Savings 261 aMW TRC Levelized Costs <$40/MWh

76 What is VRF? Variable Refrigerant Flow (VRF) Systems
One outdoor unit connects to multiple indoor units through refrigerant lines VRF systems can adjust heating and cooling outputs by adjusting the refrigerant flow and variable speed compressor Separate ventilation system (e.g., DOAS) Energy savings from: Part load efficiency Eliminated duct losses Reduced simultaneous heating/cooling Better ventilation control Heat recovery Optimized building design (new construction) VRF

77 Variable Refrigerant Flow
Applies to new buildings and some major retrofits Potential: 80 aMW over 20 years Only 6 aMW by 2021 (sl0w ramp) Significant part of savings is from DOAS Needs further research and demonstration in PNW Washington State code now has DOAS required for new buildings

78 Advanced Rooftop Controller
Advanced Rooftop Controller (ARC) – a controller applied to single zone rooftop systems with constant speed fans Some commercial buildings are over-ventilated Constant speed fans are set to run when the building is occupied The controller modulates the supply fan to reduce energy consumption

79 Advanced Rooftop Controller (ARC) Retrofit: Field-Test Results
The ARC measure is based primarily on the ARC Retrofit study conducted by Pacific Northwest National Laboratory. Study completed in 2013

80 ARC Savings Components
There are four primary components to the ARC savings: Supply Fan Speed Controls (significant portion of total savings) Integrated Air-side Economizer Controls Cooling Capacity Controls Simple on/off, and staged cooling Demand-Controlled Ventilation Controls Return-air CO2 Cost effective potential includes: 22 aMW by 2021 84 aMW by 2026 119 aMW by 2035

81 HVAC Energy Management
Measures for commercial buildings, excluding single-zone ducted systems Focused on making HVAC systems work better mostly through controls changes, operations & commissioning

82 EM Measure Assumptions
Savings= 18.5% of heating energy for electric heated buildings and 15% for gas heated buildings Compared the savings values with some limited data from ETO on commercial SEM. For office buildings, the data show about 7% total EUI savings. This translates to approximately 18% electric heating EUI savings; very similar to the 6P assumption. Baseline adjustments were made to reflect the reduced EUI's in the 2013 CBSA compared with the 2009 CBSA Sources: program data from LBL, PECI, NEEA, SMUD For retro Cx, savings range 1 to 2.2 kWh/sf from these programs. Savings range 0.5 to 1.2 kWh/sf for New. Significant achievements between 2010 and 2015 Saturation is 19% per 6 going on 7 data for "Energy Management Systems/System Controls" category Reduced the lifetime to 5 years (7 years in the 6P)

83 EM Potential EM potential
44 aMW by 2021 62 aMW by 2026 69 aMW by 2035 Represents four percent of commercial 2035 potential

84 Chasing Plug Loads

85 Smart Plug Power Strips
One way to get at it – likely other approaches IoT Measure data from RTF Based on turning off cubical ancillary (Not including computers)

86 Seventh Power Plan: Industrial Sector EE Potential

87 Key Measure & Practices
Paper: Medium Consistency Pump Mech Pulp: Refiner Replacement Mech Pulp: Premium Process Mech Pulp: Refiner Plate Improvement Kraft Pulp: Effluent Treatment System Kraft Pulp: Efficient Agitator Paper: Efficient Pulp Screen Paper: Premium Fan Paper: Material Handling Wood: Replace Pneumatic Conveyor Wood: Hydraulic Press Cold Storage Retrofit Cold Storage Tuneup Fruit Storage Refer Retrofit CS Retrofit -- CO2 Scrub CS Retrofit -- Membrane Fruit Storage Tuneup Groc Dist Retrofit & Tuneup Air Compressor Demand Reduction Air Compressor Equipment Air Compressor Management HighBay Lighting Lighting Controls Motors: Efficient Rewind VSD Controls Motor Management Program Fan Efficient Centrifugal Food: Fans and Blowers Other: Fans and Blowers Fan ASD Control Premium Pump Pump ASD Control Transformers Synchronous Belts Food: Cooling and Storage Food: Refrig Storage O&M Metal: New Arc Furnace

88 Seventh Plan Industrial Potential*
*Total Technical Potential = 661 aMW Lost some pulp and paper production Total potential by 2035: Technical Potential = 661 aMW Achievable Potential = 555 aMW Cost-Effective Potential = 553 aMW Almost all of the achievable potential identified is cost-effective Less than 6P, but still strong potential

89 Annual Incremental Potential (Industrial, Cost-Effective, by End-Use)

90 Summing Up

91 Since 1978 Utility Funded Programs and Codes and Standards have Produced Nearly 5800 aMW of Savings

92 What’s the Value of 5800 aMW? It’s represents enough energy savings to save the region’s electricity consumers nearly $3.73 billion in 2014 It lowered carbon emissions in the Pacific Northwest by an estimated 22.2 million MTE

93 Energy Efficiency Was The Region’s Second Largest Resource in 2014
Based on 2014 Actual Dispatch and Hydro Resource Output from EIA

94 50 Years to Develop the PNW Hydro-System Energy Efficiency Can Extend That Legacy


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