1. DTE Gas Company Leak Management Plan
American Gas Association
October 14, 2014

2. Our approach to Gas Leaks: ensure the safety of people first and then property
PRIORITIZING LEAK RESPONSE
P0 (“P Zero”) = Immediate Response
P1 (“P One”) = Immediate Response in the absence of a P0 leak.
P2 (“P Two”) = Request for Distribution Prospect – secondary response following initial leak response by others

3. DTE Gas Company Leak Remediation Plan Background
In Q DTE Gas developed a leak remediation plan targeting a 1st Quartile leak inventory by year-end 2013
The plan was executed under the following constraints:
Existing workforce availability (a combination of internal workforce planning and contractors)
O&M and Capital budgets
An increasing rate of incoming leaks due to the deterioration of our cast iron main infrastructure (8% CAGR between 2010 and 2014)
A critical component of this plan was a creation of a team (Infrastructure Construction Management – ICM) whose sole focus is leak repair

4. Incoming Leaks 5-Year CAGR: 8%
In Q DTE Gas developed a leak remediation plan targeting a 1st Quartile leak inventory by year- end 2013 and Top Decile by 2019
2010 – 2015 leak trend
Incoming Leaks 5-Year CAGR: 8%
-19,765
-13,677
-18,543
-19,541
-12,727
-17,719
Inventory
coming
Repaired
Inventory
coming
Repaired
Inventory
coming
Repaired
Inventory
coming
Repaired
Inventory
coming
Repaired
Inventory
(est.)
(est.)
Inventory
2010
2011
2012
2013
2014 (8+4)
Year End Leaks / Mile
0.20
0.24
0.11
0.07
0.08
0.05
Quartile Q3 Q3 Q3 Q1 Q2 D1

5. In 2014 due to the depth of the frost line we conducted a second cast iron survey which drove a significant increase of incoming leaks
 Second Cast Iron Survey

6. Continuous Improvement (CI) Efforts
Combined Leak Survey
Cast Iron Survey
Residential & Business Districts
There are a high quantity of Main Repairs that exist on the leak inventory. DTE Gas Company has implemented the following improvements to reduce job standard times and increase the number of repairs completed throughout the year
Multiple "Leaks" were grouped together by area and type, enabling more efficient dispatching
Main Repairs are being scheduled for completion by Distribution crews that will not be interrupted by emergency work
DTE Gas Company has committed to renew and/or abandon over 76 miles of Main in 2014

7. Main Leak Repair Cost per Repair ($)
We keep monitoring our cost performance relative to our peers to ensure our leak repair work is performed efficiently…
Main Leak Repair Cost per Repair ($)
$6,700
$6,778
$5,060
$5,109
$4,890
$4,894
$4,639
$4,086
$3,930
$3,132
$3,173
$3,247
$2,598
$2,671
$2,679
$2,762
$1,772
$1,510
$498
$514
$309
$178
DTE GasDTE Gas
Source: PSE&G Benchmarking

8. Emergency Response Time (minutes) and % Responses within 1 Hour
…and we monitor also response time to ensure we perform in line with the rest of the industry
Emergency Response Time (minutes) and % Responses within 1 Hour
Emergency Reposnse Time
% responses within 1 hour
DTE GasDTE Gas
Source: AGA Benchmarking

9. DTE Gas Leak Remediation Plan going forward: with our leak inventory under control, our plan now is to address our structural disadvantage
With 22% of DTE Gas main unprotected (3rd Quartile in our Peer Set) we have a structural disadvantage
Due to this structural disadvantage, we are among the utilities with the highest volume of leaks on main repaired annually
In 2014 we have developed a plan to accelerate – effective 2016 – our Main Renewal Program (MRP):
Target a 25-year replacement pace of our ~4,000 miles of unprotected main (down from 50)
Mitigate the acceleration of incoming leaks driven by the degradation of our cast iron main
Develop a mid-high pressure system to better serve our customers

10. With 22% of DTE Gas main unprotected (3rd Quartile in our Peer Set) we have a structural disadvantage
DTE Gas Miles of Main by Type
(2013 data)
Best Operated Peer Set Comparison
(% of unprotected main in 2013)
18,971
Duke OH
Kansas Gas
2,419 (13%)
1st Quartile
Cast Iron
CMS
21.5% unprotected
Indiana Gas
(Coated + Bare)
1,661 (9%)
NJ Natural Gas
Washington Gas
Laclede
(Bare + Coated)
5,087 (27%)
Niagara Mohawk
2nd Quartile
Vectren
Columbia Gas OH
PECO Energy
BGE
79% protected
DTE Gas
3rd Quartile
National Fuel Gas
9,796 (52%)
Plastic
Columbia Gas PA
PSE&G
Dominion East Ohio
4th Quartile
Peoples Natural Gas
Peoples Gas Light & Coke
Keyspan
Miles of Main

11. 2013 Main Leaks Repaired (Leaks per mile of Main)
Due to this structural disadvantage, we are among the utilities with the highest volume of leaks on main repaired annually
2013 Main Leaks Repaired (Leaks per mile of Main)
DTE GasDTE Gas
Source: AGA Benchmarking

12. Miles of Unprotected System Replacement Pace (Years)
In 2014 we have developed a plan to accelerate – effective 2016 – our Main Renewal Program to be on a pace similar to the rest of the industry
DTE Gas Peer Set: 2013 comparison of unprotected infrastructure vs. pace of replacement
National Grid
Miles of Unprotected System
Significant amount of unprotected main, faster pace
East Ohio Gas
PSE&G
DTE (160 miles/year )
DTE (80 miles/year )
Columbia of OH
ConEd
Columbia of PA
Peoples Natural Gas
PSC of CO
Peoples Gas 
CMS
BG&E
Vectren OH
NSTAR Gas
Kansas Gas
PECO Energy
Duke OH
NJ Natural Gas
Laclede  5 10 15 20 25 30 35 40 45 50 55
140
145
Replacement Pace (Years)
Source: DOT / PHMSA report