Southern Natural Gas Notice 712129

-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 06/25/26)

-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 (6/29)

Tuesday (6/30)

Wednesday (7/1)

Thursday (7/2)

Friday (7/3)

Saturday (7/4)

Sunday (7/5)

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 Line south of Helena Regulator: Scheduled Pipeline Maintenance Proj-SNG-38163(PT) (M) (5/26/2026 - 7/9/2026)

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-5000-3 (6/8/2026 - 7/5/2026)

Sesh (segment 380)

500

500

500

500

500

500

500

500

Gwinville (segment 400)

234

154

(80)

154

(80)

154

(80)

154

(80)

154

(80)

154

(80)

154

(80)

Pickens Compressor Station: Unscheduled Unit Outage Proj-4125-1 (6/23/2026 - 7/5/2026)

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

2166

(140)

2166

(140)

2166

(140)

2166

(140)

2166

(140)

2166

(140)

2166

(140)

Enterprise Compressor Station: Scheduled Unit Maintenance Proj-522212 (3/16/2026 - 7/2/2026)

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

Thomaston West (segment 490)

1,535

1350

(185)

1350

(185)

1350

(185)

1350

(185)

1350

(185)

1350

(185)

1350

(185)

Thomaston Compressor Station: Scheduled Unit Maintenance Proj-5272-2 (5/27/2026 - 7/5/2026)

Thomaston Compressor Station: Scheduled Unit Maintenance Proj-5272-5 (4/27/2026 - 7/5/2026)

South Atlanta (segment 510)

522

522

522

522

522

522

522

522

Thomaston East (segment 530)

849

849

849

849

849

849

849

849

East/South Wrens (segment 560)

680

585

(95)

585

(95)

585

(95)

585

(95)

585

(95)

585

(95)

585

(95)

Wrens Compressor Station: Scheduled Unit Maintenance Proj-5288-4 (6/15/2026 - 7/19/2026)

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.

July 2026 (updated 06/25/26)

-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 (6/29 - 7/5)

Week 2 (7/6 - 7/12)

Week 3 (7/13 - 7/19)

Week 4 (7/20 - 7/26)

Week 5 (7/27 - 8/2)

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

Helena Regulator (segment 120)

21

18

(3)

18

(3)

18

(3)

18

(3)

Bessemer Calera Line south of Helena Regulator: Scheduled Pipeline Maintenance, Proj-SNG-38163(PT) (M) (5/26/2026 - 7/9/2026)

Bessemer Calera loop line south of Helena Regulator: Scheduled Pipeline Maintenance, Proj-SNG-38163(PT) (M) (7/10/2026 - 8/24/2026)

Tarrant (segment 130)

563

438

(125)

438

(125)

438

(125)

438

(125)

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-4152-7-8-9-14 (7/20/2026 - 9/18/2026)

Dearmanville (segment 150)

346

346

346

346

346

White Castle (segment 340)

760

735

(25)

735

(25)

760

760

White Castle Compressor Station: Scheduled Unit Maintenance, Proj-5010-8 (7/6/2026 - 7/19/2026)

Sesh (segment 380)

500

500

500

500

500

Gwinville (segment 400)

234

234

234

234

234

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)

2126

(180)

2126

(180)

Enterprise Compressor Station: Scheduled Unit Maintenance, Proj-522215 (7/6/2026 - 8/9/2026) 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

2135

(170)

2135

(170)

2,305

2,305

South Main 2nd loop line east of York: Scheduled Pipeline Maintenance, Proj-SNG-36214 (7/10/2026 - 7/17/2026)

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

East/South Wrens (segment 560)

680

585

(95)

585

(95)

590

(90)

680

Wrens Compressor Station: Scheduled Unit Maintenance, Proj-5288-4 (6/15/2026 - 7/19/2026) Wrens Compressor Station: Scheduled Unit Maintenance, Proj-5288-5 (7/20/2026 - 7/26/2026)

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.

August 2026 (updated 06/25/26)

-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

203

203

Duncanville Lateral (segment 90)

36

36

36

36

36

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

Helena Regulator (segment 120)

21

18

(3)

18

(3)

18

(3)

18

(3)

38163(PT) (M) (7/10/2026 - 8/24/2026)

North Main loop line east of Providence: Scheduled Pipeline Maintenance(remediation), Proj-SNG-

Tarrant (segment 130)

563

438

(125)

438

(125)

543

(20)

543

(20)

20462/SNG-21973 (7/6/2026 - 8/14/2026)

Tarrant Compressor Station: Scheduled Unit Maintenance(panel), Proj-4152-7-8-9-14 (7/20/2026 - 9/18/2026)

Dearmanville (segment 150)

346

346

346

346

346

White Castle (segment 340)

760

760

760

760

760

Sesh (segment 380)

500

500

500

500

500

Gwinville (segment 400)

234

234

234

234

234

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

Bay Springs (segment 420)

1,675

1595

(80)

1595

(80)

1595

(80)

1595

(80)

Enterprise Compressor Station: Scheduled Unit Maintenance, Proj-522215 (7/6/2026 - 8/9/2026)

Enterprise (segment 430)

2,306

2126

(180)

2166

(140)

2166

(140)

2166

(140)

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

Ellerslie Compressor Station: Scheduled Station Maintenance, Proj-5267 (8/18/2026 - 8/20/2026)

Ellerslie (segment 490)

1,547

1,547

1,547

1317

(230)

1,547

South Atlanta (segment 510)

522

522

522

522

522

Thomaston East (segment 530)

849

849

849

849

849

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.

September 2026 (updated 06/25/26)

-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 Compressor Station: Scheduled Unit Maintenance(panel), Proj-4152-10-12 (9/14/2026 -

Tarrant (segment 130)

563

543

(20)

543

(20)

543

(20)

548

(15)

10/9/2026)

Tarrant Compressor Station: Scheduled Unit Maintenance(panel), Proj-4152-7-8-9-14 (7/20/2026 - 9/18/2026)

Dearmanville (segment 150)

346

346

346

346

346

White Castle (segment 340)

760

760

760

760

760

Sesh (segment 380)

500

500

500

500

500

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

Gwinville (segment 400)

234

154

(80)

154

(80)

154

(80)

154

(80)

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

Bay Springs (segment 420)

1,675

1595

(80)

1595

(80)

1595

(80)

1595

(80)

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

Enterprise (segment 430)

2,306

2166

(140)

2166

(140)

2166

(140)

2166

(140)

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

Gallion (Segment 440)

2,300

2,300

2145

(155)

2145

(155)

2255

(45)

South Main loop line east of Gallion: Scheduled Pipeline Maintenance(remediation), Proj-SNG-22002 (9/7/2026 - 9/18/2026)

Selma Compressor Station: Scheduled Unit Maintenance, Proj-52453 (9/14/2026 - 9/20/2026)

Selma (segment 460)

2,293

2,293

2,293

1973

(320)

2,293

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

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

East/South Wrens (segment 560)

680

680

585

(95)

680

680

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 06/25/26)

-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

Duncanville Lateral (segment 90)

36

36

36

36

36

36

Tarrant (segment 130)

563

548

(15)

518

(45)

518

(45)

518

(45)

518

(45)

Tarrant Compressor Station: Scheduled Unit Maintenance(panel), Proj-4152-10-12 (9/14/2026 - 10/9/2026)

Tarrant Compressor Station: Scheduled Unit Maintenance(panel), Proj-4152-11-13 (10/5/2026 - 10/30/2026)

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-52301 (10/12/2026 - 11/1/2026)

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

849

849

849

849

849

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.