Avista Corporation · NYSE:AVA

Avista — Technical Presentation (April 2026)

86 slides from Avista's technical presentation, Apr 15, 2026

  1. Slide 1: 2027 Electric and Natural Gas Integrated Resource Plans TAC Meeting No. 7 Agenda

    2027 Electric and Natural Gas Integrated Resource Plans Technical Advisory Committee Meeting No. 7 Agenda Wednesday, April 15, 2026 Virtual Meeting – 1:00 pm to 4:00 pm Pacific Time Topic State Audience • Introduction and Questions from TAC 6 o Synthetic Methane with Biomass • Stochastic Wholesale N

  2. Slide 2: Introductions 2027 Electric & Gas Integrated Resource Planning

    Introductions 2027 Electric & Gas Integrated Resource Planning TAC 7 – April 15, 2026 John Lyons, Ph.D. – Senior Resource Policy Analyst

  3. Slide 3: TAC 7 Agenda

    TAC 7 Agenda • Introduction and Questions from TAC 6 • Synthetic Methane with Biomass • Stochastic Wholesale Natural Gas Price Forecast • Stochastic Wholesale Electric Price Forecast • Oregon Natural Gas Avoided Cost • Long Run Load Forecast • ETO Energy Efficiency Update 2

  4. Slide 4: Meeting Guidelines

    Meeting Guidelines • IRP team is in office Monday – Wednesday; also available by email, phone and Teams for questions and comments • Stakeholder feedback responses shared with TAC at meetings, in Teams and in Appendix • Working IRP data posted to Teams • All TAC meetings will be virtual on Teams • D

  5. Slide 5: Virtual TAC Meeting Reminders

    Virtual TAC Meeting Reminders • Please mute mics unless speaking or asking a question • Raise hand or use the chat box for questions or comments • Respect the pause • Please try not to speak over the presenter or a speaker • Please state your name before commenting for the note taker • This is a pub

  6. Slide 6: DRAFT Price Forecasts – Synthetic Methane

    DRAFT Price Forecasts – Synthetic Methane (Nominal, 20-Year Levelized $/MMBtu) § 48 ITC – Available for projects that begin construction before January 1, 2025 § 48E Clean Electricity ITC – Available for electricity generation but not for producing RNG from biomass gasification → Solid line represen

  7. Slide 7: TAC 8 and TAC 9 Schedule

    TAC 8 – Monday, April 20, 2026 (13:00 – 16:00 PDT) Topic State Audience Conservation Potential Assessment All E&G Demand Response Potential Assessment All E&G TAC 9 – Friday, May 15, 2026 (13:00 – 16:00 PDT) Topic State Audience IRP Generation Option Transmission Planning Studies WA/ID Transmission

  8. Slide 8: TAC 10 and TAC 11 Schedule

    TAC 10 – Wednesday, May 27, 2025 (9:00 – 12:00 PDT) Topic State Audience CEIP Update WA Electric CETA Interim/Energy Compliance Report WA Electric Load Forecast Update All E&G TAC 11 Technical Modeling Workshop – Monday, June 15, 2026 (13:00 – 16:00 PDT) Topic State Audience PRiSM Model Tour All E&G

  9. Slide 9: TAC 12 and TAC 13 Schedule

    TAC 12 Wednesday, July 15, 2026 (13:00 – 16:00 PDT) Topic State Audience Load & Resource Balance and Methodology WA/ID Electric Loss of Load Probability WA/ID Electric WRAP Update WA/ID Electric Draft Preferred Resource Strategy Results All E&G ETO Energy Savings OR Gas TAC 13 – Monday, August 17, 2

  10. Slide 10: TAC 14 and Transmission & Distribution 5-Year Plan

    TAC 14 – Thursday, September 17, 2026 (13:00 – 16:00 PDT) Topic State Audience Portfolio Scenario Analysis All E&G Avoided Cost All Electric Resource Adequacy Results WA/ID Electric CBI Forecast and Results/Energy Burden WA/OR E&G Final Report Overview and Comment Plan All E&G Action Items All E&G E

  11. Slide 11: Other Key 2027 IRP Dates

    Other Key 2027 IRP Dates • Oct 15, 2026 – Draft Electric IRP Released to TAC • Nov TBD 2026 – Virtual Public Meeting • Noon-1pm • 6-7pm • Jan 1, 2027 – Final Electric IRP Filed • Feb 15, 2027 – Draft Gas IRP Released to TAC • Apr 1, 2027 – Final Gas IRP Filed 10

  12. Slide 12: Stochastic Wholesale E&G Price Forecast

    Stochastic Wholesale E&G Price Forecast TAC 7 – April 15, 2026 Robert Hughes Resource Planning Analyst

  13. Slide 13: Stochastic Natural Gas Price Methodology

    Stochastic Natural Gas Price Methodology Avista uses a baseline of monthly natural gas prices and varying prices based on a distribution for the 300 stochastic forecasts. Starting with Henry hub, this baseline is a blend of market forward prices, consultant forecasts, and Energy Information Administ

  14. Slide 14: Henry Hub Natural Gas Price Forecast

    Draft forecast Henry Hub Natural Gas Price Forecast 3

  15. Slide 15: Henry Hub Nominal 20 Year Levelized Price Distribution

    Draft forecast Henry Hub Nominal 20 Year Levelized Price Distribution 4

  16. Slide 16: Mid Columbia Electric Price Forecast Range with CCA

    Draft forecast Mid Columbia Electric Price Forecast Range with CCA 5

  17. Slide 17: Mid Columbia Electric Price Forecast Range W/O CCA

    Draft forecast Mid Columbia Electric Price Forecast Range W/O CCA 6

  18. Slide 18: Nominal Levelized Flat Mid Columbia Electric Price Forecast

    Draft forecast Nominal Levelized Flat Mid Columbia Electric Price Forecast WA ID 20-Year w CCA 20-Year wo CCA Deterministic $66.02 $64.21 Stochastic Mean $65.26 $63.28 10th Percentile $58.68 $57.09 50th Percentile $67.07 $64.14 95th Percentile $84.98 $83.02 7

  19. Slide 19: Oregon Natural Gas Avoided Cost

    Oregon Natural Gas Avoided Cost TAC 7 – April 15, 2026 Michael Brutocao, Natural Gas Planning Manager

  20. Slide 20: OAR 860-030-0007 Gas Utility Avoided Costs

    OAR 860-030-0007 Gas Utility Avoided Costs 1. Investor-owned gas utilities shall file a proposed avoided-cost method and draft avoided costs with their integrated resource plans pursuant to Order No. 89-507. The avoided-cost method filed should be appropriate for determining the cost effectiveness o

  21. Slide 21: Avoided Cost Component Description

    UM 1893 Avoided Cost Component Description Inflation rate Rate of inflation assumed in IRP Real Discount rate Company's Real after-tax weighted average cost of capital (WACC) Regional Act Credit 10% NW Power Act Credit applied to avoided cost value Commodity and Transport Prices Cost of marginal res

  22. Slide 22: DRAFT Avoided Costs

    DRAFT Avoided Costs $60 = Commodity = Transportation (Fuel & Flow) $50 4 =Distribution Capacity Supply Capacity =CO2 Compliance $40 + =CO2 Compliance Risk Reduction m= Risk Reduction $30 = Regional Act Credit Nominal $ Per Dekatherm on fo n N © oc oc Sf Nn NON 2031 2032 2033 2034 2035 2036 2037 2038

  23. Slide 23: Avista 2026-2050 Electric and Gas Load Forecast – Draft Results

    Avista 2026-2050 Electric and Gas Load Forecast – DRAFT RESULTS April 15, 2026 Draft Results

  24. Slide 24: Agenda

    Agenda Introduction Load Forecast Methodology and Key Assumptions Idaho Load Forecast (Electric and Gas) Oregon Gas Load Forecast (Gas Only) Washington Load Forecast (Electric and Gas) Draft Results

  25. Slide 25: Introduction

    Introduction Draft Results

  26. Slide 26: Presentation Objectives

    Presentation Objectives • Methodology and key data assumptions for developing Avista electric and gas load forecast • Predicted electric and gas load trends through 2050 in Avista service territory in ID, OR, and WA Meeting participants understand: • Proportions of electric and gas load consumed by

  27. Slide 27: Methodology and Key Assumptions

    Methodology and Key Assumptions Draft Results

  28. Slide 28: Draft End Use Forecast Overview

    Draft End Use Forecast Overview PERIOD S TAT E S 2026 to 2050 Idaho and Washington: electric and gas (all sectors, segments, end-uses) Oregon: gas only S E C TO R S END USES Residential, commercial, industrial buildings Aligned with Power Council 9th Plan Excludes: large industrial loads, energy eff

  29. Slide 29: End Use Forecast Model Overview

    End Use Forecast Model Overview Energy Use Building Modeling Approach / End Use Consumption Base Year Calibration 1. Estimate total Avista customers in each EUI/EUC segment in base year Base Year Energy and Demand 2. Estimate customer load by applying equipment saturations and energy Equipment Choic

  30. Slide 30: Key Input Data and Assumptions

    Key Input Data and Assumptions Avista trend in Heating Degree and Cooling Degree days though 2050. Trends show decreasing heating Weather Forecast and increasing cooling needs Codes and All Federal equipment standards with final rulings (Department of Energy). Washington building Standards codes for

  31. Slide 31: Segmentation

    Segmentation Sector Commercial, industrial, and residential customer loads and accounts from Avista rate classes Non-residential Non-residential business / building types: Address data-queries using Google Places API, Google and Residential Gemini and Microsoft Copilot (with human QC) Building Types

  32. Slide 32: Electrification Adoption Modeling Approach

    Electrification Adoption Modeling Approach # 𝐈𝐧𝐬𝐭𝐚𝐥𝐥𝐚𝐭𝐢𝐨𝐧𝐬 = 𝐀𝐩𝐩𝐥𝐢𝐜𝐚𝐛𝐥𝐞 𝐒𝐭𝐨𝐜𝐤 ∗ 𝐀𝐧𝐧𝐮𝐚𝐥 𝐀𝐝𝐨𝐩𝐭𝐢𝐨𝐧 % Number of installed units of Number of equipment units Percentage of applicable stock that will a given type of equipment in that have failed and need to be…

  33. Slide 33: Electrification Adoption Assumption

    Electrification Adoption Assumption Idaho Oregon Washington All end uses electric starting No electric new No electric new Commercial Building Codes 2026 – 90%* compliance construction codes construction codes phased in annually Space & water heating electric No electric new No electric new Resident

  34. Slide 34: Idaho Load Forecast

    Idaho Load Forecast Draft Results

  35. Slide 35: Idaho Electric Energy Load Forecast

    ELECTRIC Idaho Electric Energy Load Forecast Commercial End Uses 4,500 1,600 Electronics / Appliances 1,400 4,000 GWh Annual Load Lighting 1,200 Ventilation 3,500 1,000 Refrigeration 800 Space Cooling 3,000 600 Space Heating 400 Water Heating 2,500 Heat Pumps 200 GWh Annual Load - Cooking 2,000 Pool

  36. Slide 36: Idaho Electric Energy Load Forecast – Building Electrification

    ELECTRIC Idaho Electric Energy Load Forecast – Building Electrification Discussion / Findings 50 • Building electrification represents 1.1% 45 of the building load in 2050, primarily in 40 commercial buildings 35 • High conversion costs and electric energy costs slow the adoption of GWh Annual Load

  37. Slide 37: Idaho Electric Winter Peak Load Forecast

    ELECTRIC Idaho Electric Winter Peak Load Forecast Discussion / Findings Residential Commercial • Peak defined as top system 500 400 hour within each mouth 450 • Top residential winter monthly 350 peak, for Space Heat, MW Peak Hour Load MW Peak Hour Load 400 300 increased by 27% from 2026 350 Space H

  38. Slide 38: Idaho Electric Summer Peak Load Forecast

    ELECTRIC Idaho Electric Summer Peak Load Forecast Discussion / Findings Residential Commercial • Peak defined as top system hour within each mouth 450 300 • Top residential summer monthly 400 peak, for Space Cooling, MW Peak Hour Load MW Peak Hour Load 250 350 Space Cooling Space Cooling increased b

  39. Slide 39: Idaho Winter Electric Peak Load Forecast

    ELECTRIC Idaho Winter Electric Peak Load Forecast 900 Discussion / Findings Buildings peak winter growth roughly 800 proportional to energy growth. However, absolute impacts depend on end-use. For 700 example, EVs have a relatively big impact on energy load, but modest impact on peak 600 load, parti

  40. Slide 40: Idaho Summer Electric Peak Load Forecast

    ELECTRIC Idaho Summer Electric Peak Load Forecast 800 Discussion / Findings • EVs represent 2.8% of the 2050 peak 700 load 600 • Commercial 2050 peak load increased by 35% compared to 2026 MW Peak Hour Load 500 • Residential 2050 peak load increased by Electric Vehicles 14% compared to 2026 400 Indu

  41. Slide 41: Idaho Gas Energy Load Forecast

    GAS Idaho Gas Energy Load Forecast Commercial End Uses 14,000,000 5,000,000 10 Therm Annual Load 4,000,000 12,000,000 Space Heating 3,000,000 Cooking Water Heating 10,000,000 2,000,000 Pool / Spa 1,000,000 8,000,000 10 Therm Annual Load - 2026 2050 6,000,000 Residential End Uses 4,000,000 10,000,000

  42. Slide 42: Idaho Lost Gas Energy Load – Building Electrification

    GAS Idaho Lost Gas Energy Load – Building Electrification 14,000,000 Discussion / Findings • Electrification results in approximately 12,000,000 10% reduction in gas consumption by 2050, accounting for changes in 10,000,000 residential and commercial loads, relative to the total statewide load 10 Th

  43. Slide 43: Idaho Gas Winter Peak Load Forecast

    GAS Idaho Gas Winter Peak Load Forecast Residential Commercial Discussion / Findings • Peak defined as top system day within 800,000 500,000 each mouth 700,000 450,000 • Top residential winter monthly peak, for Therm-day Peak Load space heating, increased by 34% from Therm-day Peak Load 400,000 600,

  44. Slide 44: Idaho Winter Annual Gas Peak Load Forecast

    GAS Idaho Winter Annual Gas Peak Load Forecast 1,400 Discussion / Findings • Commercial 2050 load increases by 13% 1,200 compared to 2026 1,000 • Residential 2050 load increases by 34% compared to 2026 10 Therms Peak Day Load 800 • No change within industrial. While Industrial industrial sector has

  45. Slide 45: Oregon Load Forecast

    Oregon Load Forecast Draft Results

  46. Slide 46: Oregon Gas Energy Load Forecast

    GAS Oregon Gas Energy Load Forecast Commercial End Uses 12,000,000 5,000,000 10 Therm Annual Load 4,000,000 10,000,000 Space Heating 10 Therm Annual Load 3,000,000 Water Heating 2,000,000 Cooking 8,000,000 Pool / Spa 1,000,000 - 6,000,000 2026 2050 4,000,000 Residential End Uses 6,000,000 2,000,000

  47. Slide 47: Oregon Gas Energy Load Forecast – Building Electrification

    GAS Oregon Gas Energy Load Forecast – Building Electrification 14,000,000 Discussion / Findings • Electrification results in approximately 12,000,000 5% reduction in gas consumption by 2050 10,000,000 • Electrification impacts estimated by running two scenarios: 1) electrification, 10 Therm Annual L

  48. Slide 48: Oregon Gas Winter Peak Load Forecast

    GAS Oregon Gas Winter Peak Load Forecast Residential Commercial Discussion / Findings • Peak defined as top system day within 45,000 45,000 each mouth 40,000 40,000 • Top residential winter monthly peak, for Therm Peak Day Load space heating, decreased by 4% from Therm Peak Day Load 35,000 35,000 20

  49. Slide 49: Oregon Winter Annual Gas Peak Load Forecast

    GAS Oregon Winter Annual Gas Peak Load Forecast 900 Discussion / Findings 800 • Commercial 2050 load decreased by 12% compared to 2026 700 • Residential 2050 load decreased by 6% compared to 2026 600 10 Therms Peak Day Load Industrial • No change in the industrial sector 500 Residential 400 Commerci

  50. Slide 50: Washington Load Forecast

    Washington Load Forecast Draft Results

  51. Slide 51: Washington Electric Energy Load Forecast

    ELECTRIC Washington Electric Energy Load Forecast Commercial End Uses 4,500 3,000 Space Heating Water Heating 4,000 2,500 GWh Annual Load Electronics / Appliances 2,000 Heat Pumps 3,500 Refrigeration 1,500 Cooking 3,000 Space Cooling 1,000 Lighting 2,500 Ventilation GWh Annual Load 500 Pool / Spa 2,

  52. Slide 52: Washington Electric Energy Load Forecast – Building Electrification

    ELECTRIC Washington Electric Energy Load Forecast – Building Electrification Discussion / Findings 800 • Building electrification represents 11% 700 of the building load in 2050 600 • Building code requirements for new construction are the main driver GWh Annual Load 500 • Existing construction cust

  53. Slide 53: Washington Electric Summer Peak Load Forecast

    ELECTRIC Washington Electric Summer Peak Load Forecast Residential Commercial Discussion / Findings • Peak defined as top system hour within 900 600 each mouth 800 • Top residential summer monthly peak, Space Cooling MW Peak Hour Load MW Peak Hour Load Space Cooling 500 for space cooling, increased

  54. Slide 54: Washington Electric Winter Peak Load Forecast

    ELECTRIC Washington Electric Winter Peak Load Forecast Residential Commercial Discussion / Findings • Peak defined as top system hour within 1,200 1,000 each mouth 900 • Top residential winter monthly peak, for 1,000 heat pumps, increased by 138% from MW Peak Hour Load MW Peak Hour Load Ventilation

  55. Slide 55: Washington Summer Annual Electric Peak Load Forecast

    ELECTRIC Washington Summer Annual Electric Peak Load Forecast 1,600 Discussion / Findings 1,400 • EV represent approximately 7% of the 2050 Summer Peak 1,200 • Industrial peak load remains relatively steady MW Peak Hour Load 1,000 • Residential 2050 load increases by 53% Electric Vehicles compared t

  56. Slide 56: Washington Winter Annual Electric Peak Load Forecast

    ELECTRIC Washington Winter Annual Electric Peak Load Forecast 2,500 Discussion / Findings • EV represent 3% of the 2050 winter peak load 2,000 • Commercial 2050 winter peak load increases by 76% compared to 2026 MW Peak Hour Load 1,500 • Residential 2050 Feb load increased by Electric Vehicles 26% c

  57. Slide 57: Washington Gas Energy Load Forecast

    GAS Washington Gas Energy Load Forecast Commercial End Uses 30,000,000 12,000,000 10,000,000 10 Therm Annual Load 25,000,000 8,000,000 Space Heating 10 Therm Annual Load Water Heating 6,000,000 20,000,000 Cooking 4,000,000 Pool / Spa 2,000,000 15,000,000 - 2026 2050 10,000,000 Residential End Uses 1

  58. Slide 58: Washington Gas Energy Load Forecast – Building Electrification

    GAS Washington Gas Energy Load Forecast – Building Electrification 30,000,000 Discussion / Findings • Impacts from electrification on gas 25,000,000 consumption estimated by modeling an 20,000,000 electrification and no electrification scenario 15,000,000 10 Therms Annual Load • By 2050 approximatel

  59. Slide 59: Washington Gas Winter Peak Load Forecast

    GAS Washington Gas Winter Peak Load Forecast Residential Commercial Discussion / Findings • Peak defined as top system hour within 120,000 120,000 each mouth • Top residential winter monthly peak, for 10 Therms Peak Day Load space heat, decreased by 13% from 10 Therms Peak Day Load 100,000 100,000 2

  60. Slide 60: Washington Winter Monthly Gas Peak Load Forecast

    GAS Washington Winter Monthly Gas Peak Load Forecast 2,500 Discussion / Findings • Commercial 2050 peak load decreased 2,000 by 22% compared to 2026 • Residential 2050 peak load decreased by 14% compared to 2026 10 Therms Peak Day Load 1,500 • Industrial 2050 load decreased by 24% Industrial compare

  61. Slide 61: Thank You

    Thank You Next Meeting: April 20 Draft Energy Efficiency Potential Estimates Aquila Velonis Jeremy Eckstein Principal Senior Associate Aquila.Velonis@cadmusgroup.com Jeremy.Eckstein@cadmusgroup.com Taylor Bettine Technical Director Taylor.Bettine@cadmusgroup.com Draft Results

  62. Slide 62: Avista Natural Gas Energy Efficiency Savings Since 2025 IRP

    Avista Natural Gas Energy Efficiency Savings Since 2025 IRP April 2026

  63. Slide 63: Savings by Sector

    Savings by Sector 2025 Savings - IRP Projection Compared to Actual Results 300,000 118% 250,000 127% 200,000 Therms (At Meter) 150,000 100,000 163% 50,000 - Residential (Includes Multifamily) Commercial Industrial 2025 IRP - 2025 Projection 2025 Actual 2

  64. Slide 64: Savings by Sector & Building Type

    Savings by Sector & Building Type 2025 Savings - IRP Projection Compared to Actual Results 200,000 180,000 125% 138% 160,000 140,000 120,000 119% 100,000 163% 80,000 60,000 82% 40,000 20,000 - Residential New Residential Existing Commercial New Commercial Existing Industrial (Existing) 2025 IRP - 20

  65. Slide 65: Savings by Program Track

    Savings by Program Track Program Track 2025 – IRP Projection 2025 Actual 2025 Actual - % of IRP Projection New Manufactured Homes 1,838 7,459 406% Residential New New Single-Family Homes* 92,526 105,255 114% Smart Thermostats 11,836 20,014 169% Thermostat Optimization 933 1,310 140% Water Heating 2,

  66. Slide 66: Top Measures

    Top Measures Residential 150,000 Savings (Therms) 37% 34% 100,000 50,000 11% 8% 3% - New Homes Gas Furnaces Insulation Smart Thermostat Bidgely Gas Home Energy Reports Commercial 27% 60,000 Savings (Therms) 40,000 13% 13% 13% 11% 20,000 - Strategic Energy NEEA Custom Building Controls- Insulation Cu

  67. Slide 67: Projected Savings

    Projected Savings Projected Savings - 2025 IRP Compared to Multiyear Plan (MYP) 1,000,000 900,000 800,000 700,000 Therms (At Meter) 600,000 500,000 400,000 300,000 200,000 100,000 - 2026 2027 2028 2029 2030 Residential - MYP Commercial - MYP Industrial - MYP Residential - IRP Commercial - IRP Indust

  68. Slide 68: Transport Savings

    Transport Savings Actual and Projected Transport Savings 400,000 350,000 300,000 250,000 Therms (At Meter) 200,000 150,000 29% 100,000 50,000 - 2025 Actual 2026 Projected 7

  69. Slide 69: Questions?

    Questions? Willa Perlman, Planning Analyst willa.perlman@energytrust.org

  70. Slide 70: Energy Trust Dual-Fuel Heat Pump Pilot Update

    Energy Trust Dual-Fuel Heat Pump Pilot Update Implementation & Evaluation April 2026

  71. Slide 71: Definition of Dual Fuel HVAC

    Definition of Dual Fuel HVAC • For this pilot, a dual fuel HVAC system is a ducted heat pump and programmable thermostat added to an existing gas furnace. • The pilot application is single-family homes without (working) air conditioning and with gas furnaces that are 1-10 years old on average. • Hom

  72. Slide 72: Pilot Description

    Pilot Description • Energy Trust to pay full cost of installs, up to $12,000 • Installation contractors selected through RFQ projects awarded on a rolling basis • Pilot participant solicitation and house triage conducted by Energy Trust • If home qualifies, installation contractor provides bid, if b

  73. Slide 73: Participant Tracker

    Participant Tracker NWN CNG AVI Total Marketing Emails Sent 2474 518 4710 7321 Marketing Mailers Sent 681 393 3396 4470 Applications 135 77 101 313 Did Not Qualify from Application 36 45 60 141 Phone Screens 99 32 41 171 Did Not Qualify from Phone Screen 45 10 30 85 Site Visits 54 22 11 87 Did Not Q

  74. Slide 74: Evaluation Overview

    Evaluation Overview Two phased evaluation Phase 1 Phase 2 January – December 2025 October 2026 – *July 2027 Objectives: Objectives: Pilot process Gas & electric usage Customer perspectives & Gas & electric peak demand experience Customer cost & carbon Contractor perspectives & analysis market activi

  75. Slide 75: Customer Findings

    Customer Findings

  76. Slide 76: Customer Value Perspective (n=28)

    Customer Value Perspective (n=28) Most frequently mentioned benefits: • Central cooling (92%) • Improved health (60%) • Lower bills (28%) Energy savings was only mentioned as a benefit by 10% of respondents Backup fuel resilience was not mentioned as a benefit by any respondents 15

  77. Slide 77: Customer Summer Comfort Levels (n=29)

    Customer Summer Comfort Levels (n=29) Compared comfort of their home to an accessible public space Before DFHP After DFHP 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% Public much more comfortable Public more comfortable No difference Home more comfortable Home much more comfortable 16

  78. Slide 78: Customer Winter Comfort Levels (n=11)

    Customer Winter Comfort Levels (n=11) Compared comfort of their home to an accessible public space Before DFHP After DFHP 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% Public much more comfortable Public more comfortable No difference Home more comfortable Home much more comfortable 17

  79. Slide 79: Customer Cost Perspectives (n=17)

    Customer Cost Perspectives (n=17) Customer cost anxiety was present for electric bills Electric Bills Gas Bills 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% Much higher Higher No difference Lower Much lower “Respondents who experienced much higher electric bills were more vocal about these changes th

  80. Slide 80: Other Customer Findings

    Other Customer Findings • Overall system satisfaction was high (97%) • Customers expressed dislike for and had to get used to: • Cooler register exhaust temperatures • Slower response & heating times • Set thermostats differently in each season • More cost-focused and aligned with DOE in winter • Mo

  81. Slide 81: Trade Ally Contractor Findings

    Trade Ally Contractor Findings

  82. Slide 82: System Costs

    System Costs • Contractor estimates for typical installation costs ranged: • “Minimum barrier” install: $7k-$9k • Typical 2-ton install: $12k-$14k • Higher-efficiency inverter systems: $17k-$25k • Estimate that DFHPs are typically $1.5k more expensive than a traditional air conditioning system 21

  83. Slide 83: Adoption & Market Outlook

    Adoption & Market Outlook • 7 of 13 contractors include DFHPs bid for relevant customers automatically • Contractors indicate that 2% to 25% of their Residential HVAC business are DFHPs • Installs ranging from 3 to 200+ in the past 3 years • Future growth of the market for DFHPs depends on: • Availa

  84. Slide 84: Contractor Selling Points & Barriers to Sale

    Contractor Selling Points & Barriers to Sale Selling Points Barriers to Sale 1. Energy or cost savings 1. Higher electric bills 2. Added cooling 2. Colder register air 3. Available incentives 3. Upfront costs 23

  85. Slide 85: Regional Considerations: Southern Oregon

    Regional Considerations: Southern Oregon Contractors are excited about the market outlook More viable option for delivered fuel customers DFHPs offer a heat pump solution More practical for low-temperature while retaining the winter weather backup combustion fuel More customizable configuration to m

  86. Slide 86: Questions?

    Questions? Andrew Shepard andrew.shepard@energytrust.org Cody Kleinsmith cody.kleinsmith@energytrust.org

Avista — Technical Presentation (April 2026) on 6ix