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Arizona Corporation Commission Workshop on Natural Gas Infrastructure NOI February 13, 2004 Phoenix, Arizona

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Arizona Corporation Commission Workshop on Natural Gas Infrastructure NOI February 13, 2004 Phoenix, Arizona. Focus on Southwestern US Market . Natural Gas Infrastructure To Serve Arizona Unocal’s Keystone Gas Storage Facility . EPNG System. Keystone Gas Storage

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Arizona Corporation Commission Workshop on Natural Gas Infrastructure NOI February 13, 2004 Phoenix, Arizona

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  1. Arizona Corporation Commission Workshop on Natural Gas Infrastructure NOI February 13, 2004 Phoenix, Arizona 1

  2. Focus on Southwestern US Market 2

  3. Natural Gas Infrastructure To Serve Arizona Unocal’s Keystone Gas Storage Facility EPNG System • Keystone Gas Storage • Located on the suction side of the EPNG Keystone Compressor Station • Access to San Juan and Permian Supply • Access to EPNG Southern Mainline Markets Phoenix Keystone Gas Storage Keystone is well positioned to serve the growing Arizona Market. 3

  4. Keystone Gas Storage Facility Current2005 Storage Caverns 2 5 Working Gas Capacity 2 BCF 5 BCF Injection (MMCFD) 100 167 Deliverability (MMCFD) 200 333 Pipeline Interconnects: El Paso Northern Natural Transwestern 4

  5. Keystone Gas StorageBenefits To Arizona Customers • Security of supply • Supply Diversity • Manage daily and intraday load swings • Optimize pipeline capacity utilization • Manage Price Volatility • Meet Seasonal needs 5

  6. Keystone Gas StorageServices Offered • Firm Storage • Customer has firm injection, withdrawal and capacity rights and access to all three interconnects • Park and Loan • Customer and Keystone agree to a specific injection and withdrawal schedule, receipt and delivery points, and fee schedule – can be firm or interruptible • Examples: cash to next month, weekend to next week, and intra-day to next trading day • Wheeling • Customer can make use of the Keystone interconnects on an interruptible basis to move gas between El Paso, NNG and TW 6

  7. Keystone Gas StorageFirm Storage Service Rate Structure • Demand Charges • Capacity $0.05/mmbtu • Injection $1.50/mmbtu/d • Withdrawal $0.75/mmbtu/d • Commodity Charges • Injection $0.01/mmbtu plus 1.5% fuel retention • Withdrawal $0.01/mmbtu • Overrun Charges* (Maximum Rates) • Injection $0.10/mmbtu • Withdrawal $0.10/mmbtu Typical 60 day cycle service capability $1.50/MMBTU of Capacity per year * Overrun Charges are in addition to the applicable commodity charges 7

  8. Does Arizona need Market Area Storage? • Yes! • Keystone can meet much of Arizona’s needs • Market area storage gives Arizona greater security of supply and real time load following capability • Arizona needs a mix of market area and production area storage options 8

  9. Unocal’s Storage Development Activities in Arizona • Provide 3-6 BCF of high deliverability storage capacity to serve the Phoenix-Tucson market • Serve Load following requirements of power generators, peaking requirements of LDC’s and provide market supply security • Focus is Picacho Basin • Significant potential for pipeline interconnects and potential direct connections • In Service 2006-2007 9

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