Northern Natural Gas Company

Fifth Revised Volume No. 1

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Effective Date: 04/17/2010, Docket: RP10-501-000, Status: Effective

21 Revised Sheet No. 144 21 Revised Sheet No. 144

Superseding: 20 Revised Sheet No. 144

RATE SCHEDULE IDD

Interruptible Deferred Delivery Service

Section 3 of this Rate Schedule and set forth in Shipper's Service Agreement. This Rate

Schedule shall provide Shipper the ability to have natural gas volumes delivered to or

received from Northern on a deferred basis under a Firm or Interruptible Throughput Service

Agreement.

Shipper electing to inject volumes may nominate a volume of natural gas up to its daily

Interruptible Deferred Quantity. Upon acceptance of such nomination or portion thereof by

Northern, Shipper shall deliver volumes released for Interruptible Deferred Delivery

Service to Northern.

Shipper whose volumes are transported to this service and held in an account for subsequent

transportation under Rate Schedule TF, TFX, LFT or TI shall specify any of the following

designated deferred delivery points (hereinafter referred to as a deferred delivery point)

as its injection and withdrawal storage point:

Ogden MWP/Hockley Transwestern Halley

Demarcation ONEOK WesTex/NNG Carson Linam Ranch

Permian Pinnacle Lea WTU/San Angelo

Mid-Continent WTU/Rio Pecos Golden Spread/Mustang Station

ONEOK WesTex/NNG Hale Ventura

Oasis Waha CIG Dumas TW/NNG Gray

El Paso Plains Pleasant Valley Enogex Arapaho

CEGT Redmoon ONEOK WesTex/NNG Reeves ANR Greensburg

Atmos Spraberry PEPL Mullinville Enogex Custer

Cheyenne Plains CIG Garden City ONEOK WesTex/NNG Seagraves

Enbridge-Pampa Valero Spraberry

ONEOK Westex Moore El Paso Keystone

Pony Express (Tescott)

Mustang Station Unit 5

In addition to the storage points listed above, there is a storage point associated

with each Mileage Indicator District (MID) as set forth in Rate Schedule MPS.

Volumes received by Northern from Shipper shall be considered transported by Northern

pursuant to the upstream or downstream Firm or Interruptible Throughput Service Agreement

to the deferred delivery point and held in an account for Shipper. A transportation charge

shall be assessed.

Shipper electing to withdraw volumes shall be entitled to nominate a volume of natural gas

up to its Interruptible Deferred Quantity. Upon acceptance of such nomination by Northern

Northern shall make available at the deferred delivery point the quantity of natural