1. 2018 Retro-Commissioning (RCx) Program

2. 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

3. CenterPoint Commercial Programs
www.
CenterPointEfficiency
.com 3

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

5. 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

6. 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

7. 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

8. 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

9. 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

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

11. RCx Agents Assigned by program staff or by facility owner:
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

12. 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

13. 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

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

15. Questions? www.centerpointefficiency.com
For more information on CenterPoint’s energy efficiency programs, please visit:
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 15