Southern Natural Gas Notice 712300

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TSP/TSP Name: 6900518-SOUTHERN NATURAL GAS CO. Critical: Y Notice Type Desc (1): PIPELINE CONDITIONS Notice Type Desc (2): CURRENT PIPELINE CONDITIONS Notice Eff Date/Time: 08/19/2026 3:24:15PM Notice End Date/Time: 08/20/2026 9:00:00am Post Date/Time: 8/19/2026 3:24:15 PM Notice ID: 712300 Reqrd Rsp: 1 Rsp Date/Time: 8/19/2026 12:00:00 AM Notice Stat Desc: INITIATE Prior Notice: Subject: Pipeline Conditions as of 08-20-2026

Notice Text:

Effective Timely Cycle for gas day Thursday, August 20, 2026, and continuing until further notice, SNG restricted the following:

OPERATIONAL FLOW ORDERS (OFO)

Type 3 Level 1 OFO South System will be in effect for the start of the gas day, Wednesday, August 12, 2026, until further notice, Notice ID # 712268

RESTRICTIONS (SEGMENT)

· 30 (ONWARD) - Exceeds Operating Capacity - Reductions into OP Services

· 50 (PICKENS EAST) BH - Exceeds Operating Capacity - Reductions through OP Services

· 120 (HELENA REG) - Exceeds Operating Capacity - Reductions through OP Services

· 200 (HARTWELL) - Exceeds Operating Capacity - Reductions into OP Services

· 350 (NORTH OF WHITE CASTLE) - Exceeds Operating Capacity - Reductions through OP Services

· 380 (SNG - SESH) - Exceeds Operating Capacity - Reductions into OP Services

· 400 (GWINVILLE) - Exceeds Operating Capacity - Reductions through OP Services

· 410 (GWINVILLE EAST) - Exceeds Operating Capacity - Reductions through OP Services

· 420 (BAY SPRINGS) - Exceeds Operating Capacity - Reductions through OP Services

· 530 (THOMASTON EAST) - Exceeds Operating Capacity - Reductions into OP Services

RESTRICTIONS (LINEPACK)

Payback Due Pipe – None

Payback Due Shipper – Not Accepting Until Further Notice

RESTRICTIONS (STORAGE)

Incremental Interruptible Storage (ISS) Injections not allowed - See Notice # 711727

Type 3 / 4 OFO Probability (Unlikely (UL); Too Close to Call (TC); Likely (L); Highly Likely (HL))

August 20, 2026 – OFO until further notice

Type 6 OFO Probability (Unlikely (UL); Too Close to Call (TC); Likely (L); Highly Likely (HL))

August 20, 2026 – UL for Short and UL for Long Imbalances

August 21, 2026 – UL for Short and UL for Long Imbalances

August 22, 2026 – UL for Short and UL for Long Imbalances

August 23, 2026 – UL for Short and UL for Long Imbalances