Southern Natural Gas Company

Seventh Revised Volume No. 1

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

Fifty-Sixth Revised Sheet No. 18 Fifty-Sixth Revised Sheet No. 18

Superseding: Fifty-Fifth Revised Sheet No. 18

Interruptible Transportation Service 3/

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Transportation Charge 1/ 2/ DELIVERY ZONE

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Maximum/Maximum Including

Surcharges (Dth) Production

Receipt Zone Area Zone 1 Zone 2 Zone 3

Production Area 25.30¢/25.49¢ 30.10¢/30.29¢ 46.40¢/46.59¢ 62.40¢/62.59¢

Zone 1 25.30¢/25.49¢ 14.10¢/14.29¢ 30.40¢/30.59¢ 46.40¢/46.59¢

Zone 2 25.30¢/25.49¢ 14.10¢/14.29¢ 25.60¢/25.79¢ 41.60¢/41.79¢

Zone 3 25.30¢/25.49¢ 14.10¢/14.29¢ 25.60¢/25.79¢ 25.30¢/25.49¢

ANNUAL

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Minimum Rate (Dth) Production

Receipt Zone Area Zone 1 Zone 2 Zone 3

Production Area 2.70¢ 3.40¢ 5.70¢ 7.10¢

Zone 1 2.70¢ .70¢ 3.10¢ 4.50¢

Zone 2 2.70¢ .70¢ 2.40¢ 3.80¢

Zone 3 2.70¢ .70¢ 2.40¢ 1.50¢

Backhaul Transportation Charge (Dth) 1/ DELIVERY ZONE

Max/Max With Surcharges: Production

Receipt Zone Area Zone 1 Zone 2 Zone 3

Production Area 24.10¢/24.29¢ N/A N/A N/A

Zone 1 24.10¢/24.29¢ 13.80¢/13.99¢ N/A N/A

Zone 2 24.10¢/24.29¢ 13.80¢/13.99¢ 24.60¢/24.79¢ N/A

Zone 3 24.10¢/24.29¢ 13.80¢/13.99¢ 24.60¢/24.79¢ 24.70¢/24.89¢

Backhaul Transportation DELIVERY ZONE

Charge Minimum: Production

Receipt Zone Area Zone 1 Zone 2 Zone 3

Production Area 1.50¢ N/A N/A N/A

Zone 1 1.50¢ .40¢ N/A N/A

Zone 2 1.50¢ .40¢ 1.40¢ N/A

Zone 3 1.50¢ .40¢ 1.40¢ .80¢

Fuel Retention:

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Forward Haul Fuel,

Used & Unaccounted For 1.09% 1.09% 1.52% 1.84%

Intrazone Fuel,

Used & Unaccounted For 1.09% 0.41% 0.41% 0.41%

Backhaul Fuel,

Used & Unaccounted For 0.16% 0.16% 0.16% 0.16%

1/ Surcharge applicable to service under Rate Schedule IT and Supply Pool Balancing

Agreement.

Storage Cost Reconciliation

Mechanism Volumetric Surcharge: $ .000 applicable to each Dth transported.

2/ Surcharges applicable to service under Rate Schedule IT.

GRI Surcharge: $ .000 applicable to each Dth transported.

ACA Surcharge: $ .0019 applicable to each Dth transported.

3/ 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.