El Paso Natural Gas Company

Second Revised Volume No. 1A

Effective Date: 04/01/2010, Docket: RP10-454-001, Status: Effective

Second Revised Sheet No. 147A Second Revised Sheet No. 147A

Superseding: First Revised Sheet No. 147A

RATE SCHEDULE IHSW

Interruptible Hourly Swing Service

(Continued)

2. APPLICABILITY AND CHARACTER OF SERVICE (Continued)

2.4 Subject to 2.4(a) and 2.4(b) of this rate schedule, IHSW service

consists of Transporter delivering gas quantities at a Delivery

Point on Shipper's behalf that are equal to the difference between

the total Hourly Scheduled Entitlements at such Delivery Point, as

defined by the daily scheduled quantity and specified hourly rights

in the Transport TSAs scheduled to the Delivery Point, and the

actual hourly gas flows at such point.

(a) In any hour, IHSW service commences once the actual hourly

flow at a Delivery Point exceeds the Safe Harbor Tolerance

Quantities based on the total of the Hourly Scheduled

Entitlements for such point on the applicable Transport TSAs.

IHSW rates shall only apply to those quantities in excess of

the Safe Harbor Tolerance Quantities.

(b) Transporter will allocate to the IHSW TSA that portion of the

difference between Shipper's Hourly Scheduled Entitlement

quantities based on its daily scheduled quantity at an

eligible Delivery Point and the quantity actually taken at

such point that is in excess of the applicable Safe Harbor

Tolerance Quantities, up to the limitations set forth in

Section 3.4 of this rate schedule.

2.5 IHSW service is an automatic service; it is not nominated.

Transporter will apply contracted hourly rights, based on the

Transport TSA(s) scheduled to the Delivery Point, to the daily

scheduled quantity to determine hourly quantities.

2.6 Should both a firm Shipper and a Rate Schedule IT-1 Shipper each use

a separate IHSW TSA for deliveries to the same Delivery Point, the

DP Operator shall indicate which hourly service agreement is assumed

to be used first. If the DP Operator does not so indicate, the Rate

Schedule IT-1 related IHSW agreement ("IT IHSW") shall be used

first.

3. CONDITIONS OF SERVICE

3.1 Transporter may, due to operational constraints, suspend the

availability of IHSW service on any Day and at any time during the

Gas Day prior to the close of the nomination period for Cycle 4.

3.2 A Shipper who acquires capacity subject to the provisions of Section

9 of the GT&C may use IHSW service in conjunction with such capacity

for at least one Month at a time.