Southern Natural Gas Notice 711966

-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 05/07/26)

-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 (5/11)

Tuesday (5/12)

Wednesday (5/13)

Thursday (5/14)

Friday (5/15)

Saturday (5/16)

Sunday (5/17)

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

Bessemer Calera Line north of Helena Regulator: Scheduled Pipeline Maintenance

Bessemer Calera (segment 120)

100

82

(18)

82

(18)

82

(18)

82

(18)

82

(18)

82

(18)

82

(18)

Proj-SNG-38163(PT) (4/1/2026 - 5/21/2026)

Dearmanville (segment 150)

346

346

346

346

346

346

346

346

White Castle (segment 340)

760

760

760

760

760

760

760

760

SESH: Scheduled Maintenance (M) (5/11/2026)

Sesh (segment 380)

506

451

(55)

479

(27)

506

506

506

506

483

(23)

SESH: Scheduled Maintenance (M) (5/12/2026) SESH: Scheduled Maintenance (M) (5/17/2026)

Gwinville (segment 400)

234

234

234

234

234

234

234

234

Bay Springs Compressor Station: Scheduled Unit Maintenance

Bay Springs (segment 420)

1,675

1595

(80)

1595

(80)

1595

(80)

1595

(80)

1595

(80)

1595

(80)

1595

(80)

Proj-52161 (7/8/2025 - 10/31/2026)

Enterprise Compressor Station: Scheduled Unit Maintenance

Enterprise (segment 430)

2,306

2236

(70)

2236

(70)

2236

(70)

2236

(70)

2236

(70)

2236

(70)

2236

(70)

Proj-522212 (3/16/2026 - 5/22/2026)

Gallion Compressor Station: Scheduled Unit Maintenance

Gallion (Segment 440)

2,300

2255

(45)

2255

(45)

2255

(45)

2255

(45)

2255

(45)

2255

(45)

2255

(45)

Proj-5236-8 (4/27/2026 - 5/13/2026)

Gallion Compressor Station: Scheduled Unit Maintenance Proj-5236-9 (5/14/2026 - 5/28/2026)

Selma Compressor Station: Unscheduled Unit Maintenance

Selma (segment 460)

2,293

2128

(165)

2128

(165)

2128

(165)

2128

(165)

2128

(165)

2128

(165)

2128

(165)

Proj-52301 (12/22/2025 - 5/31/2026)

Elmore Compressor Station: Scheduled Unit Maintenance

Elmore (segment 460)

2,010

2,010

2,010

2,010

1755

(255)

1755

(255)

1755

(255)

2,010

Proj-525112 (5/14/2026 - 5/16/2026)

Auburn Compressor Station: Scheduled Unit Maintenance

Auburn (segment 460)

1,953

1698

(255)

1698

(255)

1698

(255)

1,953

1,953

1,953

1,953

Proj-52593 (5/11/2026 - 5/13/2026)

Ellerslie (segment 490)

1,547

1,547

1,547

1,547

1,547

1,547

1,547

1,547

Thomaston Compressor Station: Scheduled Unit Maintenance

Thomaston West (segment 490)

1,535

1520

(15)

1520

(15)

1520

(15)

1520

(15)

1520

(15)

1520

(15)

1520

(15)

Proj-5272-5 (4/27/2026 - 5/17/2026)

South Atlanta (segment 510)

522

522

522

522

522

522

522

522

Thomaston East (segment 530)

849

849

849

849

849

849

849

849

Ocmulgee Compressor Station: Scheduled Unit Maintenance

Ocmulgee (segment 530)

804

659

(145)

659

(145)

659

(145)

659

(145)

659

(145)

659

(145)

659

(145)

Proj-52775 (4/6/2026 - 5/24/2026)

Hall Gate Compressor Station: Scheduled Unit Maintenance

Hall Gate (segment 560)

705

560

(145)

560

(145)

560

(145)

560

(145)

560

(145)

560

(145)

560

(145)

Proj-52833 (4/20/2026 - 5/24/2026)

Hall Gate Compressor Station: Unscheduled Unit Outage Proj-5283-1 (4/22/2026 - 5/17/2026)

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.

May 2026 (updated 05/07/26)

-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 (5/4 - 5/10)

Week 2 (5/11 - 5/17)

Week 3 (5/18 - 5/24)

Week 4 (5/25 - 5/31)

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 (segment 120)

100

82

(18)

100

Bessemer Calera Line north of Helena Regulator: Scheduled Pipeline Maintenance, Proj-SNG-38163(PT) (4/1/2026 - 5/21/2026)

Helena Regulator (segment 120)

21

21

18

(3)

Bessemer Calera Line south of Helena Regulator: Scheduled Pipeline Maintenance, Proj-SNG-38163(PT) (M) (5/25/2026 - 7/4/2026)

Dearmanville (segment 150)

346

346

346

White Castle (segment 340)

760

760

760

Sesh (segment 380)

506

448

(58)

506

SESH: Scheduled Maintenance (M) (5/18/2026 - 5/22/2026) SESH: Scheduled Maintenance (M) (5/23/2026)

Gwinville (segment 400)

234

234

234

Bay Springs (segment 420)

1,675

1595

(80)

1595

(80)

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

Enterprise (segment 430)

2,306

2236

(70)

2126

(180)

Enterprise Compressor Station: Scheduled Unit Maintenance, Proj-522212 (3/16/2026 - 5/22/2026)

Enterprise Compressor Station: Scheduled Unit Maintenance, Proj-522215 (5/26/2026 - 6/28/2026)

York

'ZONE 1/2 BOUNDARY'

(segment 440)

2,305

2080

(225)

2,305

York Compressor Station: Scheduled Unit Maintenance, Proj-52303 (5/21/2026 - 5/23/2026)

Gallion (Segment 440)

2,300

2255

(45)

2255

(45)

Gallion Compressor Station: Scheduled Unit Maintenance, Proj-5236-9 (5/14/2026 - 5/28/2026)

Selma (segment 460)

2,293

2003

(290)

2128

(165)

Selma Compressor Station: Scheduled Unit Maintenance, Proj-52453 (5/18/2026 - 5/20/2026) Selma Compressor Station: Unscheduled Unit Maintenance, Proj-52301 (12/22/2025 - 5/31/2026)

Ellerslie (segment 490)

1,547

1402

(145)

1,547

Ellerslie Compressor Station: Scheduled Unit Maintenance , Proj-52678-9 (5/18/2026 - 5/21/2026)

Thomaston West (segment 490)

1,535

1520

(15)

1520

(15)

Thomaston Compressor Station: Scheudled Unit Maintenance, Proj-52722 (5/18/2026 - 6/11/2026)

South Atlanta (segment 510)

522

522

522

Thomaston East (segment 530)

849

849

849

Ocmulgee (segment 530)

804

659

(145)

804

Ocmulgee Compressor Station: Scheduled Unit Maintenance, Proj-52775 (4/6/2026 - 5/24/2026)

Hall Gate (segment 560)

705

635

(70)

705

Hall Gate Compressor Station: Scheduled Unit Maintenance, Proj-52833 (4/20/2026 - 5/24/2026)

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.

June 2026 (updated 05/07/26)

-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 (6/1 - 6/7)

Week 2 (6/8 - 6/14)

Week 3 (6/15 - 6/21)

Week 4 (6/22 - 6/28)

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) (5/25/2026 - 7/4/2026)

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 (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 (5/26/2026 - 6/28/2026)

York

'ZONE 1/2 BOUNDARY'

(segment 440)

2,305

2,305

2235

(70)

2235

(70)

2,305

South Main 2nd loop line east of York: Scheduled Pipeline Maintenance, Proj-SNG-36214 (6/12/2026 - 6/21/2026)

Auburn (segment 460)

1,953

1738

(215)

1848

(105)

1793

(160)

1793

(160)

South Main loop line east of Auburn: Scheduled Pipeline Maintenance(remediation), Proj-SNG-20457(1) (6/1/2026 - 6/6/2026)

South Main loop line east of Auburn: Scheduled Pipeline Maintenance(remediation), Proj-SNG-20457(2) (6/7/2026 - 6/14/2026)

South Main loop line east of Auburn: Scheduled Pipeline Maintenance(remediation), Proj-SNG-22003(1) (6/15/2026 - 6/22/2026)

South Main loop line east of Auburn: Scheduled Pipeline Maintenance(remediation), Proj-SNG-22003(2) (6/23/2026 - 6/28/2026)

Ellerslie (segment 490)

1,547

1,547

1,547

1,547

1,547

Thomaston West (segment 490)

1,535

1520

(15)

1520

(15)

1,535

1,535

Thomaston Compressor Station: Scheudled Unit Maintenance, Proj-52722 (5/18/2026 - 6/11/2026)

South Atlanta (segment 510)

522

522

522

522

522

Thomaston East (segment 530)

849

849

849

849

849

East/South Wrens (segment 560)

680

680

590

(90)

680

680

Wrens Compressor Station: Scheduled Unit Maintenance, Proj-52885 (6/8/2026 - 6/10/2026)

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.

July 2026 (updated 05/07/26)

-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

203

Duncanville Lateral (segment 90)

36

36

36

36

36

36

Helena Regulator (segment 120)

21

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) (5/25/2026 - 7/4/2026)

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)

543

(20)

North Main line east of Providence: Scheduled Pipeline Maintenance(remediation), Proj-SNG-20462 (7/1/2026 - 7/24/2026)

Tarrant Compressor Station: Scheduled Unit Maintenance(panel), Proj-41527-8-9-10-11 (7/6/2026 - 9/13/2026)

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)

1595

(80)

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

Enterprise (segment 430)

2,306

2,306

2,306

2,306

2,306

2,306

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.

-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 05/07/26)

-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,

Helena Regulator (segment 120)

21

18

(3)

18

(3)

18

(3)

18

(3)

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

Tarrant Compressor Station: Scheduled Unit Maintenance(panel), Proj-41527-8-9-10-11

Tarrant (segment 130)

563

543

(20)

543

(20)

543

(20)

543

(20)

(7/6/2026 - 9/13/2026)

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

Bay Springs (segment 420)

1,675

1595

(80)

1595

(80)

1595

(80)

1595

(80)

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

Enterprise (segment 430)

2,306

2,306

2,306

2,306

2,306

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.