Southern Natural Gas Notice 712253

-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 08/06/26)

-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 (8/10)

Tuesday (8/11)

Wednesday (8/12)

Thursday (8/13)

Friday (8/14)

Saturday (8/15)

Sunday (8/16)

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

Helena Regulator (segment 120)

21

18

(3)

18

(3)

18

(3)

18

(3)

18

(3)

18

(3)

18

(3)

Bessemer Calera loop line south of Helena Regulator: Scheduled Pipeline Maintenance Proj-SNG-38163(PT) (M) (7/10/2026 - 8/18/2026)

Tarrant (segment 130

563

438

(125)

438

(125)

438

(125)

438

(125)

438

(125)

543

(20)

543

(20)

North Main loop line east of Providence: Scheduled Pipeline Maintenance(remediation) Proj-SNG-20462/SNG-21973 (7/6/2026 - 8/14/2026)

Tarrant Compressor Station: Scheduled Unit Maintenance(panel) Proj-4152-14 (7/13/2026 - 8/12/2026)

Tarrant Compressor Station: Scheduled Unit Maintenance(panel) Proj-4152-7-8-9 (7/20/2026 - 9/25/2026)

Dearmanville (segment 150)

346

346

346

346

346

346

346

346

White Castle (segment 340)

760

685

(75)

685

(75)

685

(75)

685

(75)

685

(75)

685

(75)

685

(75)

Shadyside Compressor Station: Scheduled Unit Maintenance Proj-5000-5 (8/10/2026 - 8/23/2026)

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 - 9/13/2026)

South Main line east of Enterprise: Unscheduled Pipeline Maintenance - CAO (5/30/2026 - 12/31/2026)

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

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.

August 2026 (updated 08/06/26)

-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 (8/3 - 8/9)

Week 2 (8/10 - 8/16)

Week 3 (8/17 - 8/23)

Week 4 (8/24 - 8/30)

Primary Outage(s)

Est. Operational Capacity (Operational Impact) - Thousand Dth

Onward (segment 30)

203

203

203

Duncanville Lateral (segment 90)

36

36

36

Bessemer Calera loop line south of Helena Regulator: Scheduled Pipeline Maintenance,

Helena Regulator (segment 120)

21

18

(3)

21

Proj-SNG-38163(PT) (M) (7/10/2026 - 8/18/2026)

Tarrant Compressor Station: Scheduled Unit Maintenance(panel), Proj-4152-7-8-9

Tarrant (segment 130)

563

543

(20)

543

(20)

(7/20/2026 - 9/25/2026)

Dearmanville (segment 150)

346

346

346

Shadyside Compressor Station: Scheduled Unit Maintenance, Proj-5000-5

White Castle (segment 340)

760

685

(75)

760

(8/10/2026 - 8/23/2026)

Sesh (segment 380)

507

507

507

Gwinville (segment 400)

234

234

234

Bay Springs Compressor Station: Scheduled Unit Maintenance, Proj-52161

Bay Springs (segment 420)

1,675

1595

(80)

1595

(80)

(7/8/2025 - 10/31/2026)

Enterprise Compressor Station: Scheduled Unit Maintenance, Proj-5222-15

Enterprise (segment 430)

2,306

2126

(180)

2126

(180)

(8/3/2026 - 9/13/2026)

South Main line east of Enterprise: Unscheduled Pipeline Maintenance - CAO (5/30/2026 - 12/31/2026)

South Main loop line east of Gallion: Scheduled Pipeline Maintenance(remediation),

Gallion (Segment 440)

2,300

2145

(155)

2,300

Proj-SNG-22002 (8/17/2026 - 8/23/2026)

Ellerslie Compressor Station: Scheduled Station Maintenance, Proj-5267 (8/28/2026)

Ellerslie (segment 490)

1,547

1,547

1317

(230)

South Atlanta (segment 510)

522

522

522

Thomaston East (segment 530)

849

849

849

Wrens Compressor Station: Scheduled Unit Maintenance, Proj-5288-5 (8/17/2026 - 8/20/2026)

East/South Wrens (segment 560)

680

590

(90)

680

South Georgia (segment 650)

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.

September 2026 (updated 08/06/26)

-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 (8/31 - 9/6)

Week 2 (9/7 - 9/13)

Week 3 (9/14 - 9/20)

Week 4 (9/21 - 9/27)

Primary Outage(s)

Est. Operational Capacity (Operational Impact) - Thousand Dth

Onward (segment 30)

203

203

203

203

203

Duncanville Lateral (segment 90)

36

36

36

36

36

Tarrant (segment 130)

563

543

(20)

543

(20)

543

(20)

543

(20)

Tarrant Compressor Station: Scheduled Unit Maintenance(panel), Proj-4152-10-12 (9/21/2026 - 10/9/2026)

Tarrant Compressor Station: Scheduled Unit Maintenance(panel), Proj-4152-7-8-9 (7/20/2026 - 9/25/2026)

Dearmanville (segment 150)

346

346

346

346

346

White Castle (segment 340)

760

760

735

(25)

735

(25)

760

White Castle Compressor Station: Scheduled Unit Maintenance, Proj-5010-7 (9/7/2026 - 9/20/2026)

Sesh (segment 380)

500

500

500

500

500

Gwinville (segment 400)

234

154

(80)

154

(80)

154

(80)

154

(80)

Pickens Compressor Station: Scheduled Unit Maintenance, Proj-4125-2 (8/31/2026 - 9/23/2026)

Bay Springs (segment 420)

1,675

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)

2166

(140)

2166

(140)

Enterprise Compressor Station: Scheduled Unit Maintenance, Proj-5222-15 (8/3/2026 - 9/13/2026)

South Main line east of Enterprise: Unscheduled Pipeline Maintenance - CAO (5/30/2026 - 12/31/2026)

York

'ZONE 1/2 BOUNDARY'

(segment 440)

2,305

2,305

2010

(295)

2,305

2,305

York Compressor Station: Scheduled Station Maintenance, Proj-5230 (9/7/2026 - 9/8/2026)

Gallion (Segment 440)

2,300

2,300

2255

(45)

2255

(45)

2030

(270)

Gallion Compressor Station: Scheduled Unit Maintenance, Proj-5236-10 (9/21/2026 - 10/21/2026) Gallion Compressor Station: Scheduled Unit Maintenance, Proj-5236-9 (9/7/2026 - 9/27/2026)

Ellerslie (segment 490)

1,547

1,547

1,547

1,547

1,547

South Atlanta (segment 510)

522

522

522

522

522

Thomaston East (segment 530)

849

849

849

849

849

Ocmulgee (segment 530)

804

804

804

659

(145)

804

Ocmulgee Compressor Station: Scheduled Unit Maintenance, Proj-5277-6 (9/14/2026 - 9/20/2026)

East/South Wrens (segment 560)

680

680

585

(95)

680

680

Wrens Compressor Station: Scheduled Unit Maintenance, Proj-5288-4 (9/8/2026 - 9/11/2026)

South Georgia (segment 650)

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 08/06/26)

-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

203

203

203

Louisville East (segment 50)

520

330

(190)

520

520

520

520

Louisville Compressor Station: Scheduled Unit Maintenance, Proj-4132-10(LS) (9/28/2026 - 9/29/2026)

Duncanville Lateral (segment 90)

36

36

36

36

36

36

Tarrant (segment 130)

563

548

(15)

548

(15)

518

(45)

518

(45)

518

(45)

Tarrant Compressor Station: Scheduled Unit Maintenance(panel), Proj-4152-10-12 (9/21/2026 - 10/9/2026)

Tarrant Compressor Station: Scheduled Unit Maintenance(panel), Proj-4152-11-13 (10/12/2026 - 10/30/2026)

Pell City Station (segment 140)

474

474

229

(245)

474

474

474

North Main loop line west of Dearmanville: Scheduled Pipeline Maintenance(remediation), Proj-4165(WB) (10/5/2026 - 10/11/2026)

Dearmanville (segment 150)

346

346

346

346

346

346

White Castle (segment 340)

760

760

760

760

760

760

Sesh (segment 380)

500

500

500

500

500

500

Gwinville (segment 400)

234

234

234

234

234

234

Bay Springs (segment 420)

1,675

1595

(80)

1595

(80)

1595

(80)

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

2166

(140)

2166

(140)

2166

(140)

2166

(140)

2166

(140)

South Main line east of Enterprise: Unscheduled Pipeline Maintenance - CAO (5/30/2026 - 12/31/2026)

York

'ZONE 1/2 BOUNDARY'

(segment 440)

2,305

2,305

2,305

2215

(90)

2215

(90)

2215

(90)

York Compressor Station: Scheduled Unit Maintenance, Proj-5230-1 (10/12/2026 - 11/1/2026)

Gallion (Segment 440)

2,300

2030

(270)

2030

(270)

2030

(270)

2030

(270)

2,300

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

Elmore (segment 460)

2,010

2,010

1915

(95)

2,010

2,010

2,010

Elmore Compressor Station: Scheduled Unit Maintenance, Proj-5251B (10/6/2026 - 10/8/2026)

Ellerslie (segment 490)

1,547

1,547

1,547

1,547

1,547

1,547

South Atlanta (segment 510)

522

522

522

522

522

522

Thomaston East (segment 530)

849

659

(190)

849

849

849

849

Ocmulgee Compressor Station: Scheduled Unit Maintenance, Proj-5277-6 (9/28/2026 - 10/4/2026)

East/South Wrens (segment 560)

680

680

680

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

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.

November 2026 (updated 08/06/26)

-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 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

2310

(140)

2310

(140)

2310

(140)

2310

(140)

(5/30/2026 - 12/31/2026)

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.