Picarro Leak Surveyor Brad Coppedge Center Point Energy

What is the Picarro Surveyor. TM? Safety is our number one priority and we are committed to providing safe and reliable operation of pipelines and delivery services in all of our communities. The Picarro Surveyor. TM: • Surveys mains and services and identifies potential leaks via a vehicle. • This vehicle mounted gas leak detection device is 1, 000 x more sensitive than current leak detection technology. • Is capable of detecting leaks down to one part per billion in ambient air while reducing false positives from naturally occurring methane. • Measures and maps methane plumes in the air as the vehicle is driven offering a dramatic improvement over hand-held instruments used in walking surveys. • Facilitates repair teams to pinpoint actual leak location and grade the leak. CNP has conducted pilots in Houston & Minneapolis to evaluate Picarro’s performance as compared to current methods; both pilots reported more than 5 x improvements in leak find rate and about a 20% boost in productivity. © 2012 Center. Point Energy Proprietary and Confidential Information 2

Picarro Deployment Roadmap Risk based Deployment & Utilization Cases Use Picarro for Highest Risk Surveys Full Deployment Include IT changes 3 © 2012 Center. Point Energy Proprietary and Confidential Information

Picarro Technology Overview © 2012 Center. Point Energy Proprietary and Confidential Information

CRDS works here: 1 PPB FID works here: 1 PPM 0. 01 PPM Methane

Methane plumes from leaks behave like smoke plumes © 2012 Center. Point Energy Proprietary

Picarro Surveyor. TM - Isotopic Analysis Surveyor’s stable isotope measurement can distinguish source of methane as pipeline gas or from natural sources (landfill, sewer gas etc. ) © 2012 Center. Point Energy Proprietary and Confidential Information

Picarro Surveyor. TM for Natural Gas Leaks – Graphical User Interface Leak indication search area (LISA) Field of view Peak bubbles Isotopic analysis result © 2012 Center. Point Energy Proprietary and Confidential Information 8

Paperless Application © 2012 Center. Point Energy Proprietary and Confidential Information 9

Picarro Surveyor. TM– Survey Coverage Day Survey Night Survey The effect of atmospheric stability: typical Field of View (FOV) comparison between daytime vs. nighttime survey coverage © 2012 Center. Point Energy Proprietary and Confidential Information

Picarro Surveyor. TM 1 st Survey (5 mph avg. wind speed) © 2012 Center.

Picarro Surveyor. TM Composite of 1 st & 2 nd Survey © 2012 Center.

Increased Leaks Preparing for the Impact • Leak Prediction Models based on Picarro Pilots • By Region • By District • By Office Area • Regulatory Outreach and Alignment • Proactive Planning for availability of required increase in Crews • Contract • Company • Paperless Applications – Immediately available Data • Evaluating “Supercrew” concept • Proactive System Replacement Planning 13 © 2012 Center. Point Energy Proprietary and Confidential Information

Value Added Use Cases • QA/QC • Pinpoint difficult to find leaks • NLF (No leak found) • Special LUFG Surveys • Natural Disasters • Implosions 14 © 2012 Center. Point Energy Proprietary and Confidential Information

Richmond Ave F - Gas in Sewer

Hallettsville Earthquake © 2012 Center. Point Energy Proprietary and Confidential Information 16

NLF Test Case