System Expansion 4 (SSE4) Project is a natural gas pipeline expansion project by Southern Natural Gas Co., LLC & Elba Express Co., LLC (Kinder Morgan) in MS, AL, GA, SC. It is approved but not yet under construction. Stated capacity is 1.323 Bcf/d. In-service timing is stated as fourth quarter of 2029. FERC docket CP25-517. Sources: FERC filings, the sponsor's public material and EIA's pipeline project tracker. Last verified by Enercast on Nov 10, 2026.
| Status | Approved | EIA, dated Sep 23, 2026 |
|---|---|---|
| Capacity | 1.323 Bcf/d stated | EIA, dated Sep 23, 2026 |
| In-service timing | fourth quarter of 2029 company-stated | Company, read Nov 11, 2026 |
| Operator | Southern Natural Gas Co., LLC & Elba Express Co., LLC (Kinder Morgan) | EIA, dated Sep 23, 2026 |
| Project type | Expansion | EIA, dated Sep 23, 2026 |
| States | MS, AL, GA, SC | EIA, dated Sep 23, 2026 |
| Length | 291 miles | EIA, dated Sep 23, 2026 |
| Jurisdiction | Interstate (FERC-regulated) · FERC | EIA, dated Sep 23, 2026 |
| FERC docket | CP25-517 | EIA, dated Sep 23, 2026 |
| Demand served | LDC, Electric | EIA, dated Sep 23, 2026 |
| Last verified | Nov 10, 2026 | all sources fetched |
Capacity and in-service timing are what the source states. None is measured or forecast by Enercast. How to read this page.
Milestones
- FERC approval stated
Change log
| Recorded | Field | Change | Source |
|---|---|---|---|
| Nov 11, 2026 | Stated in-service | 2028 → fourth quarter of 2029 | Company, read Nov 11, 2026 |
“Recorded” is the day Enercast approved the change, not the day it happened.
Sources
- FERC: FERC Approved Major Pipeline Projects (as of 09/24/2026): CP25-517
- Company: Kinder Morgan: SSE4 project page“KMI expects to place the first phase of the project in service in the fourth quarter of 2028 and the second phase in the fourth quarter of 2029.”
- EIA: EIA Natural Gas Pipeline Projects, release 2026-11-04: System Expansion 4 (SSE4) Project