Commonwealth North Gas Pipeline Infrastructure. September 13, 2013

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1 Commonwealth North Gas Pipeline Infrastructure September 13, 2013

2 Presentation Overview ENSTAR Overview Distribution vs. Transmission Pipelines Cook Inlet Transmission Pipelines Transmission System Capacity Transmission System Reliability Gas Storage Imported Gas

3 Established 1961 Number of Meters 134,000+ Number of Alaskans Served* 361,800 Miles of Distribution Mains 3,200+ Transmission Mains Miles 400+ Number of ENSTAR Employees 190 * 134,000 Meters x 2.7 Alaskan Consumers per Meter

4 ENSTAR s Distribution System Pressure Regulation Station Reduces transmission pressure to distribution pressure, SCADA monitored, relief valve protects distribution system from over pressurization. Distribution Pipelines 60 PSI MAOP Mains 2-8" HDPE, typically in road right-of-ways, 36-48" deep, have locate wire.

5 ENSTAR Transmission System

6 Cook Inlet Pipeline System

7 2013/ MMscfd CI Demand and Production 100% On-line West side production and demand 30 Steelhead Steelhead 10 Tesoro Kenai Gas Field West Flow 0 KPL Compression Kenai All numeric values are approximate MMscfd. Hilcorp ENSTAR pipelines ConocoPhillips Tesoro KNPL Kalifonski Station Granite Pt Junction KPL Junct HEA KKPL APPL Dual East 1 Aurora CINGSA Soldotna Aurora & misc. 20 H/K/S Flow 31 North Cook Inlet Swanson River 30 CEA Royalty Gudenrath Station Supply = Steelhead 1 Aurora 74 BRU 12 PC & west 54 CINGSA 180 East side 20 Power Plant Flow 25 River Unit 54 Flow BRU Wasilla Palmer Anchorage Demand = CEA 5 Fairbanks NG 40 Wasilla/Palmer 30 MLP 165 ENSTAR Anchorage 30 HEA/Kenai/Soldotna & Tesoro Pretty Creek & misc. West Side 12 PC Fairbanks NG Flow 87 Flow WP 5 FNG Flow MLP 165 Anch 45 CEA

8 2013/ MMscfd CI Demand/Production 100% On-line West side production and demand 30 Steelhead Kenai Gas Field Steelhead West Flow 24 KPL Compression 10 Tesoro Kenai All numeric values are approximate MMscfd. Hilcorp ENSTAR pipelines ConocoPhillips Tesoro KNPL Kalifonski Station Granite Pt Junction KPL Junct HEA KKPL APPL Dual East 1 Aurora CINGSA Soldotna Aurora & misc. 25 H-K-S Flow 55 North Cook Inlet Swanson River 30 CEA Royalty Gudenrath Station Supply = Steelhead 1 Aurora 74 BRU 12 PC & west 128 CINGSA 180 East side 20 Power Plant Flow 45 River Unit 54 Flow BRU Wasilla Palmer Anchorage Demand = CEA 5 Fairbanks NG 65 Wasilla/Palmer 35 MLP 195 ENSTAR Anchorage 35 HEA/Kenai/Soldotna & Tesoro Pretty Creek & misc. West Side 12 PC Fairbanks NG Flow 111 Flow WP 5 FNG Flow MLP 195 Anch 45 CEA

9 2013/ MMscfd CI Demand/Production No Steelhead West side production and demand 0 Steelhead Steelhead 10 Tesoro Kenai Gas Field West Flow 55 KPL Compression Kenai All numeric values are approximate MMscfd. Hilcorp ENSTAR pipelines ConocoPhillips Tesoro KNPL Kalifonski Station Granite Pt Junction KPL Junct HEA KKPL APPL Dual East 1 Aurora CINGSA Soldotna Aurora & misc. 25 H-K-S Flow 56 North Cook Inlet Swanson River 30 CEA Royalty Gudenrath Station Supply = Steelhead 5 Aurora 74 BRU 12 PC & west 154 CINGSA 180 Eastside 20 Power Plant Flow 46 River Unit 54 Flow BRU Wasilla Palmer Anchorage Demand = CEA 5 Fairbanks NG 65 Wasilla/Palmer 35 MLP 195 ENSTAR Anchorage 35 HEA/Kenai/Soldotna & Tesoro Pretty Creek & misc. West Side 12 PC Fairbanks NG Flow 112 Flow WP 5 FNG Flow MLP 195 Anch 45 CEA

10 ENSTAR Pipeline Integrity Pipelines Use Modern High Quality Manufactured Pipe Low Stress/Minimal Cyclic Fatigue Absence of Internal Corrosion Due To High Gas Quality Very Dry Gas, < 4 lb/mmscf H20 No Stress Corrosion Cracking Good Soil Conditions and Cathodic Protection System Single Rupture Failure: Susitna River Washout in 1993 Preventative 811 Call Before You Dig On-site Excavation Representative From ENSTAR Aerial/ROW Patrol Modern SCADA System Pipeline Integrity Management Program (IMP) Horizontal Directional Drill Relocation of Susitna River Crossings

11 Project Impact Currently allows storage of 11 BCF. Allows for purchase and storage of gas during summer for use during winter peak demands. Designed to meet more than 30% of monthly average peak demand during the 2012/2013 winter. Helps alleviate need for winter peak well capacity to meet peak daily utility demand. Source: Robin Barry, ENSTAR Available for storage of possible imported LNG or CNG.

12 Pipeline-Storage-Imports

13 Regulatory Impacts Transmission upgrades affect rates. 80% of transmission plant was allocated to gas sales customers in 2008 Cost of Service Study. ENSTAR has used a measured approach to transmission upgrades to ensure that its traditional customers get the benefits they are paying for. ENSTAR s tariff provides that an expansion of service cannot cause an unreasonable cost burden to be borne by existing customers. Cost causer, cost payer

14 Future Pipeline Planning Continue to upgrade ENSTAR Kenai to Anchorage pipelines by line replacement and additional compression. Examine additional compression to move gas East to West on. CINGSA expansion to occur as needed Examine gas imports and re-gas to be installed if needed. System modifications dependent largely on gas sources.