Southern Natural Gas Notice 712502

-Restrictions to Primary In-Path transportation services may be necessary.

SNG - Outage Impact Report

-Restrictions to In-Path transportation services may be necessary.

Seven Day Forecast (updated 10/08/26)

-Restrictions to Interruptible and Out of Path transportation services may be necessary.

-No anticipated impact to transportation services.

Station / Seg

Est Nominal Design Capacity (Thousand Dth)

Monday (10/12)

Tuesday (10/13)

Wednesday (10/14)

Thursday (10/15)

Friday (10/16)

Saturday (10/17)

Sunday (10/18)

Primary Outage(s) that may Impact Throughput

Est. Operational Capacity (Operational Impact) - Thousand Dth

Onward (segment 30)

203

203

203

203

203

203

203

203

Duncanville Lateral (segment 90)

36

36

36

36

36

36

36

36

Tarrant (segment 130

563

518

(45)

518

(45)

518

(45)

518

(45)

518

(45)

518

(45)

518

(45)

Tarrant Compressor Station: Scheduled Unit Maintenance(panel) Proj-4152-11-13 (9/16/2026 - 10/20/2026)

Tarrant Compressor Station: Scheduled Unit Maintenance(panel) Proj-4152-12 (10/10/2026 - 10/30/2026)

Pell City Station (segment 140)

474

229

(245)

229

(245)

229

(245)

229

(245)

229

(245)

474

474

North Main loop line west of Dearmanville: Scheduled Pipeline Maintenance(remediation) Proj-4165(WB) (10/12/2026 - 10/16/2026)

Dearmanville (segment 150)

346

326

(20)

326

(20)

326

(20)

326

(20)

326

(20)

326

(20)

326

(20)

Bell Mills Compressor Station: Scheduled Unit Maintenance Proj-4500-1 (10/5/2026 - 10/18/2026)

White Castle (segment 340)

760

760

355

(405)

355

(405)

355

(405)

700

(60)

700

(60)

700

(60)

White Castle Compressor Station: Scheduled Unit Maintenance Proj-5010-8 (10/16/2026 - 10/30/2026)

White Castle Compressor Station: Scheduled Unit Maintenance Proj-5010-8-9-10 (10/13/2026 - 10/15/2026)

Sesh (segment 380)

507

507

507

507

507

507

507

507

Gwinville (segment 400)

234

234

234

234

234

234

234

234

Bay Springs (segment 420)

1,675

1595

(80)

1595

(80)

1595

(80)

1595

(80)

1595

(80)

1595

(80)

1595

(80)

Bay Springs Compressor Station: Scheduled Unit Maintenance Proj-52161 (7/8/2025 - 10/31/2026)

Enterprise (segment 430)

2,306

2126

(180)

2126

(180)

2126

(180)

2126

(180)

2126

(180)

2126

(180)

2126

(180)

Enterprise Compressor Station: Scheduled Unit Maintenance Proj-5222-15 (8/3/2026 - 10/31/2026)

South Main line east of Enterprise: Unscheduled Pipeline Maintenance - CAO (5/30/2026 - 10/31/2026)

York

'ZONE 1/2 BOUNDARY'

(segment 440)

2,305

2215

(90)

2215

(90)

2215

(90)

2215

(90)

2215

(90)

2215

(90)

2215

(90)

York Compressor Station: Scheduled Unit Maintenance Proj-5230-1 (10/5/2026 - 10/31/2026)

Gallion (Segment 440)

2,300

2030

(270)

2030

(270)

2030

(270)

2030

(270)

2030

(270)

2030

(270)

2030

(270)

Gallion Compressor Station: Scheduled Unit Maintenance Proj-5236-10 (9/21/2026 - 10/21/2026)

Elmore (segment 460)

2,010

1755

(255)

1755

(255)

1755

(255)

1755

(255)

1755

(255)

1755

(255)

1755

(255)

Elmore Compressor Station: Scheduled Unit Maintenance Proj-5251-12 (10/12/2026 - 10/18/2026)

Ellerslie (segment 490)

1,547

1,547

1,547

1,547

1,547

1,547

1,547

1,547

South Atlanta (segment 510)

522

522

522

522

522

522

522

522

Thomaston East (segment 530)

849

849

849

849

849

849

849

849

Ocmulgee (segment 530)

804

659

(145)

659

(145)

659

(145)

659

(145)

659

(145)

659

(145)

659

(145)

Ocmulgee Compressor Station: Scheduled Unit Maintenance Proj-5277-6 (9/22/2026 - 10/18/2026)

South Georgia (segment 650)

127

127

127

127

127

127

127

127

This document is updated on a weekly basis and outage schedules/impacts are subject to change as the week progresses. Dates posted on DART should be deemed correct in the event of conflicts between DART posted dates and dates on this report.

The impacts sheet are based on steady-state hydraulic models assuming recent operating flows, conditions, and various unit outages.

-Restrictions to Primary In-Path transportation services may be necessary.

SNG - Outage Impact Report

-Restrictions to In-Path transportation services may be necessary.

October 2026 (updated 10/08/26)

-Restrictions to Interruptible and Out of Path transportation services may be necessary.

-No anticipated impact to transportation services.

Station / Seg

Est Nominal Design Capacity (Thousand Dth)

Week 1 (9/28 - 10/4)

Week 2 (10/5 - 10/11)

Week 3 (10/12 - 10/18)

Week 4 (10/19 - 10/25)

Week 5 (10/26 - 11/1)

Primary Outage(s)

Est. Operational Capacity (Operational Impact) - Thousand Dth

Onward (segment 30)

203

203

203

Duncanville Lateral (segment 90)

36

36

36

Tarrant (segment 130)

563

518

(45)

538

(25)

Tarrant Compressor Station: Scheduled Unit Maintenance(panel), Proj-4152-11-13 (9/16/2026 - 10/20/2026)

Tarrant Compressor Station: Scheduled Unit Maintenance(panel), Proj-4152-12 (10/10/2026 - 10/30/2026)

Tarrant Compressor Station: Scheduled Unit Maintenance(panel), Proj-4152-9 (10/20/2026 -

10/31/2026)

Dearmanville (segment 150)

346

326

(20)

326

(20)

Bell Mills Compressor Station: Scheduled Unit Maintenance, Proj-4500-02 (10/19/2026 - 10/29/2026)

White Castle (segment 340)

760

700

(60)

700

(60)

White Castle Compressor Station: Scheduled Unit Maintenance, Proj-5010-8 (10/16/2026 - 10/30/2026)

Sesh (segment 380)

507

460

(47)

447

(60)

SESH: Scheduled Station Maintenance (M) (10/20/2026) SESH: Scheduled Station Maintenance (M) (10/21/2026 - 10/22/2026)

SESH: Scheduled Station Maintenance (M) (10/23/2026) SESH: Scheduled Station Maintenance (M) (10/27/2026) SESH: Scheduled Station Maintenance (M) (10/28/2026) SESH: Scheduled Station Maintenance (M) (10/29/2026)

Gwinville (segment 400)

234

234

234

Bay Springs (segment 420)

1,675

1595

(80)

1560

(115)

Bay Springs Compressor Station: Scheduled Unit Maintenance, Proj-5216-1 (11/1/2026 - 3/31/2027) Bay Springs Compressor Station: Scheduled Unit Maintenance, Proj-52161 (7/8/2025 - 10/31/2026)

Enterprise (segment 430)

2,306

2126

(180)

2051

(255)

Enterprise Compressor Station: Scheduled Unit Maintenance, Proj-5222-15 (11/1/2026 - 11/15/2026) Enterprise Compressor Station: Scheduled Unit Maintenance, Proj-5222-15 (8/3/2026 - 10/31/2026) South Main line east of Enterprise: Unscheduled Pipeline Maintenance - CAO (11/1/2026 - 3/31/2027) South Main line east of Enterprise: Unscheduled Pipeline Maintenance - CAO (5/30/2026 - 10/31/2026)

York

'ZONE 1/2 BOUNDARY'

(segment 440)

2,305

2215

(90)

2050

(255)

York Compressor Station: Scheduled Unit Maintenance, Proj-5230-1 (10/5/2026 - 10/31/2026) York Compressor Station: Scheduled Unit Maintenance, Proj-5230-1 (11/1/2026 - 11/15/2026)

Gallion (Segment 440)

2,300

2030

(270)

2145

(155)

Gallion Compressor Station: Scheduled Unit Maintenance, Proj-5236-10 (9/21/2026 - 10/21/2026) South Main loop line east of Gallion: Scheduled Pipeline Maintenance(remediation), Proj-SNG-22002 (10/26/2026 - 11/1/2026)

Ellerslie (segment 490)

1,547

1,547

1,547

Thomaston West (segment 490)

1,535

1520

(15)

1520

(15)

Thomaston Compressor Station: Scheduled Unit Maintenance, Proj-5272-1 (10/19/2026 - 10/25/2026) Thomaston Compressor Station: Scheduled Unit Maintenance, Proj-5272-3 (10/26/2026 - 10/29/2026)

South Atlanta (segment 510)

522

522

522

Thomaston East (segment 530)

849

849

849

East/South Wrens (segment 560)

680

590

(90)

680

Wrens Compressor Station: Scheduled Unit Maintenance, Proj-5288-5 (10/19/2026 - 10/23/2026)

South Georgia (segment 650)

127

127

127

Holy Trinity (segment 655)

127

127

101

(26)

Holy Trinity Compressor Station: Scheduled Unit Maintenance, Proj-58051-2 (10/26/2026 - 10/30/2026)

This document is updated on a weekly basis and outage schedules/impacts are subject to change as the week progresses. Dates posted on DART should be deemed correct in the event of conflicts between DART posted dates and dates on this report.

The impacts sheet are based on steady-state hydraulic models assuming recent operating flows, conditions, and various unit outages.

-Restrictions to Primary In-Path transportation services may be necessary.

SNG - Outage Impact Report

-Restrictions to In-Path transportation services may be necessary.

November 2026 (updated 10/08/26)

-Restrictions to Interruptible and Out of Path transportation services may be necessary.

-No anticipated impact to transportation services.

Station / Seg

Est Nominal Design Capacity (Thousand Dth)

Week 1 (11/2 - 11/8)

Week 2 (11/9 - 11/15)

Week 3 (11/16 - 11/22)

Week 4 (11/23 - 11/29)

Primary Outage(s)

Est. Operational Capacity (Operational Impact) - Thousand Dth

Onward (segment 30)

209

209

209

209

209

Duncanville Lateral (segment 90)

36

36

36

36

36

Dearmanville (segment 150)

355

355

355

355

355

White Castle (segment 340)

798

798

798

798

798

Sesh (segment 380)

500

500

500

500

500

Gwinville (segment 400)

234

234

234

234

234

Bay Springs (segment 420)

1,817

1702

(115)

1702

(115)

1702

(115)

1702

(115)

Bay Springs Compressor Station: Scheduled Unit Maintenance, Proj-5216-1 (11/1/2026 - 3/31/2027)

Enterprise (segment 430)

2,450

2195

(255)

2195

(255)

2400

(50)

2400

(50)

Enterprise Compressor Station: Scheduled Unit Maintenance, Proj-5222-15 (11/1/2026 - 11/15/2026)

South Main line east of Enterprise: Unscheduled Pipeline Maintenance - CAO (11/1/2026 - 3/31/2027)

York

'ZONE 1/2 BOUNDARY'

(segment 440)

2,449

2194

(255)

2194

(255)

2,449

2,449

York Compressor Station: Scheduled Unit Maintenance, Proj-5230-1 (11/1/2026 - 11/15/2026)

Ellerslie (segment 490)

1,663

1,663

1,663

1,663

1,663

South Atlanta (segment 510)

537

537

537

537

537

Thomaston East (segment 530)

900

900

900

900

900

South Georgia (segment 650)

143

143

143

143

143

This document is updated on a weekly basis and outage schedules/impacts are subject to change as the week progresses.

Dates posted on DART should be deemed correct in the event of conflicts between DART posted dates and dates on this report.

The impacts sheet are based on steady-state hydraulic models assuming recent operating flows, conditions, and various unit outages.

-Restrictions to Primary In-Path transportation services may be necessary.

SNG - Outage Impact Report

-Restrictions to In-Path transportation services may be necessary.

December 2026 (updated 10/08/26)

-Restrictions to Interruptible and Out of Path transportation services may be necessary.

-No anticipated impact to transportation services.

Station / Seg

Est Nominal Design Capacity (Thousand Dth)

Week 1 (11/30 - 12/6)

Week 2 (12/7 - 12/13)

Week 3 (12/14 - 12/20)

Week 4 (12/21 - 12/27)

Week 5 (12/28 - 1/3)

Primary Outage(s)

Est. Operational Capacity (Operational Impact) - Thousand Dth

Onward (segment 30)

209

209

209

209

209

209

Duncanville Lateral (segment 90)

36

36

36

36

36

36

Dearmanville (segment 150)

355

355

355

355

355

355

White Castle (segment 340)

798

798

798

798

798

798

Sesh (segment 380)

500

500

500

500

500

500

Gwinville (segment 400)

234

234

234

234

234

234

Bay Springs (segment 420)

1,817

1702

(115)

1702

(115)

1702

(115)

1702

(115)

1702

(115)

Bay Springs Compressor Station: Scheduled Unit Maintenance, Proj-5216-1 (11/1/2026 - 3/31/2027)

Enterprise (segment 430)

2,450

2400

(50)

2400

(50)

2400

(50)

2400

(50)

2400

(50)

South Main line east of Enterprise: Unscheduled Pipeline Maintenance - CAO (11/1/2026 - 3/31/2027)

Ellerslie (segment 490)

1,663

1,663

1,663

1,663

1,663

1,663

South Atlanta (segment 510)

537

537

537

537

537

537

Thomaston East (segment 530)

900

900

900

900

900

900

South Georgia (segment 650)

143

143

143

143

143

143

This document is updated on a weekly basis and outage schedules/impacts are subject to change as the week progresses.

Dates posted on DART should be deemed correct in the event of conflicts between DART posted dates and dates on this report. The impacts sheet are based on steady-state hydraulic models assuming recent operating flows, conditions, and various unit outages.

-Restrictions to Primary In-Path transportation services may be necessary.

SNG - Outage Impact Report

-Restrictions to In-Path transportation services may be necessary.

January 2027 (updated 10/08/26)

-Restrictions to Interruptible and Out of Path transportation services may be necessary.

-No anticipated impact to transportation services.

Station / Seg

Est Nominal Design Capacity (Thousand Dth)

Week 1 (1/4 - 1/10)

Week 2 (1/11 - 1/17)

Week 3 (1/18 - 1/24)

Week 4 (1/25 - 1/31)

Primary Outage(s)

Est. Operational Capacity (Operational Impact) - Thousand Dth

Onward (segment 30)

209

209

209

209

209

Duncanville Lateral (segment 90)

36

36

36

36

36

Dearmanville (segment 150)

355

355

355

355

355

White Castle (segment 340)

798

798

798

798

798

Sesh (segment 380)

500

500

500

500

500

Gwinville (segment 400)

234

234

234

234

234

Bay Springs Compressor Station: Scheduled Unit Maintenance, Proj-5216-1

Bay Springs (segment 420)

1,817

1702

(115)

1702

(115)

1702

(115)

1702

(115)

(11/1/2026 - 3/31/2027)

South Main line east of Enterprise: Unscheduled Pipeline Maintenance - CAO

Enterprise (segment 430)

2,450

2400

(50)

2400

(50)

2400

(50)

2400

(50)

(11/1/2026 - 3/31/2027)

Ellerslie (segment 490)

1,663

1,663

1,663

1,663

1,663

South Atlanta (segment 510)

537

537

537

537

537

Thomaston East (segment 530)

900

900

900

900

900

South Georgia (segment 650)

143

143

143

143

143

This document is updated on a weekly basis and outage schedules/impacts are subject to change as the week progresses.

Dates posted on DART should be deemed correct in the event of conflicts between DART posted dates and dates on this report.

The impacts sheet are based on steady-state hydraulic models assuming recent operating flows, conditions, and various unit outages.