2018 Retro-Commissioning (RCx) Program

RCx Staff Calvin Burnham, PE, CEM CenterPoint – Program Manager Ding Li, PhD, PE, LEED AP Nexant – Project Manager Dave Ledbetter Nexant – Customer Outreach David Ashley, PE, CEM, LEED AP Nexant – Regional Manager 2

CenterPoint Commercial Programs www. CenterPointEfficiency .com 3

Retro-Commissioning (RCx) What is Retro-Commissioning?

What is RCx? …a systematic process for identifying and implementing operational and maintenance improvements in a building to optimize the performance of subsystems and the whole building. ...focuses on O&M and diagnostic testing, although needed capital improvements may be identified and recommended through the process. - ACEEE

Potential Customer Benefits Free Comprehensive Energy Assessment Demand Reduction and Annual Energy Savings Low Implementation Cost Short Payback Operating Cost Savings Extend Equipment Life 6

Typical RCx Measures HVAC Controls Optimization HVAC scheduling, temperature reset, chiller sequencing, etc. Outside Air Optimization Demand control ventilation, rebalancing, etc. Variable Frequency Drives (VFDs) Adding or optimizing VFDs (pumps, fans, etc.) System Repairs Control valves, damper actuators, sensors, compressed air leaks, insulation, etc. Lighting Controls Occupancy sensors, daylighting, time clocks, etc. Miscellaneous De-lamping, carbon monoxide (CO) sensor control of parking garage exhaust fans, re-commissioning old thermal energy storage systems, etc. 7

Ineligible Measures Equipment Replacements Chillers, air handling units (AHUs), motors, etc. Lighting Retrofits T12 to T8/T5, metal halides to LEDs New DDC System Adding a full scale DDC unit Plug Loads Lamps, kitchen appliances, laptops, etc. 8

Customer Eligibility Non-Residential Customers in CenterPoint Energy’s electric service territory AND Non-Transmission Customers (< 69kV service) OR Non-Profit / Educational / Governmental Transmission Customers 9

Facility Eligibility Size: >= 50,000 SF High Energy Use Intensity (EUI) → kWh/SF Significant baseline kWh/yr and peak kW 10

RCx Agents Assigned by program staff or by facility owner: https://cnprcx.nexantcloud.com/agent/public_list/ Work with facility staff to collect info and discuss potential ECMs Perform comprehensive on-site assessments for each facility, focusing on low-cost/no- cost measures Prepare detailed reports with facility descriptions, ECM descriptions, savings calculations, and cost estimates 11

Application Screening Phase Program Phases Application Screening Phase Nexant screens application Preliminary Assessment Phase report created and sent to building owner Contracts are executed Investigation Phase Agent performs in-depth site assessment Agent completes report with detailed ECM savings calculations, master list of findings (OST), etc. Owner signs OST Implementation Phase Owner implements their selected ECMs Owner coordinates with the agent for verification visit Agent provides Nexant details of verification methodology Verification Phase Agent conducts verification visit of implemented ECMs Agent completes VP report with verified savings 12

Customer Commitment Implement all measures with payback < 3.0 yrs that produce a total project payback < 1.5 yrs Toward that package, spend at least $0.03/SF or the full package price, whichever is smaller Examples: Scenario #1 Scenario #2 Facility size (SF) 200k 3.0/1.5 package cost $4,000 $8,000 $0.03/SF commitment $6,000 Customer must implement… 13

Typical Results Lawrence Berkeley National Lab 2005: Energy Savings: 7% - 29% Cost Savings: $0.27 / SF CenterPoint Program 2016-2017: Energy Savings: 5% - 15% Cost Savings: $0.16 / SF 14

Questions? www.centerpointefficiency.com For more information on CenterPoint’s energy efficiency programs, please visit: www.centerpointefficiency.com Calvin Burnham, PE, CEM CenterPoint – Program Manager calvin.burnham@centerpointenergy.com Ding Li, PhD, PE, LEED AP Nexant – Project Manager dli@nexant.com Dave Ledbetter Nexant – Customer Outreach dledbetter@nexant.com David Ashley, PE, CEM, LEED AP Nexant – Regional Manager dashley@nexant.com 15