Desert Southwest Expansion Project is a natural gas pipeline expansion project by Transwestern in NM, AZ. It is in FERC's pre-filing process. Stated capacity is 2.3 Bcf/d. In-service timing is stated as By Q4 2029. FERC docket PF26-9. Sources: the sponsor's public material and EIA's pipeline project tracker. Last verified by Enercast on Nov 10, 2026.
| Status | Pre-filing | EIA, dated Jul 6, 2026 |
|---|---|---|
| Capacity | 2.3 Bcf/d stated | EIA, dated Jul 6, 2026 |
| In-service timing | By Q4 2029 company-stated | Company, read Nov 11, 2026 |
| Operator | Transwestern | EIA, dated Jul 6, 2026 |
| Project type | Expansion | EIA, dated Jul 6, 2026 |
| States | NM, AZ | EIA, dated Jul 6, 2026 |
| Length | 516 miles | EIA, dated Jul 6, 2026 |
| Jurisdiction | Interstate (FERC-regulated) · FERC | EIA, dated Jul 6, 2026 |
| FERC docket | PF26-9 | EIA, dated Jul 6, 2026 |
| Demand served | Power | EIA, dated Jul 6, 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
No dated milestones recorded yet. They are added as FERC orders, construction authorizations and in-service notices appear.
Change log
| Recorded | Field | Change | Source |
|---|---|---|---|
| Nov 11, 2026 | Stated in-service | 2029 → By Q4 2029 | Company, read Nov 11, 2026 |
“Recorded” is the day Enercast approved the change, not the day it happened.
Sources
- Company: Energy Transfer Q3 2026 earnings presentation“Desert Southwest Expansion By Q4 2029”
- EIA: EIA Natural Gas Pipeline Projects, release 2026-11-04: Desert Southwest expansion project