Southern Natural Gas Company

Seventh Revised Volume No. 1

Effective Date: 03/01/2010, Docket: RP09-427-003, Status: Effective

Eighth Revised Sheet No. 21 Eighth Revised Sheet No. 21

Superseding: Substitute Seventh Revised Sheet No. 21

INTERRUPTIBLE STORAGE SERVICE (ISS) 1/

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Maximum Minimum

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ISS Average Daily Balance Charge (Dth) 8.870¢ .000¢

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ISS Injection .950¢ .950¢

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ISS Withdrawal .950¢ .950¢

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Fuel Retention:

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Injection .81%

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Withdrawal .81%

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1/ The foregoing rates have been established pursuant to the terms of the Settlement filed in

Docket No. RP09-427 for all Contesting Parties as defined in the Settlement.