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DT Midstream has advanced three pipeline projects to final investment decision, including a 300-MMcf/d Midwestern expansion, a lateral for a new 900-MW Indiana power plant and Guardian Pipeline modernization.
Published by Allstream Insiders
Allstream Insiders Summary
DT Midstream has reached final investment decision on three pipeline projects that together represent more than $400 million of new organic investment, according to the company’s October 29, 2026, third-quarter release and investor presentation. The decisions cover the MIST S1 mainline expansion on Midwestern Gas Transmission, a new Midwestern pipeline lateral serving a planned 900-megawatt power plant in Indiana, and the second phase of the Guardian Pipeline modernization program.
DT Midstream disclosed a combined $275 million to $325 million capital investment for the MIST S1 expansion and power-plant lateral, and a separate $130 million to $150 million investment for Guardian Phase 2. The company therefore disclosed approximately $405 million to $475 million across the three newly approved projects, although it did not assign a separate capital amount to each of the two Midwestern projects.
The FIDs are meaningful project-advancement milestones, but the release does not identify engineering firms, construction contractors, line-pipe suppliers, compressor manufacturers or other equipment awards. The company’s presentation lists the power-plant lateral for service in the first half of 2028, MIST S1 for the fourth quarter of 2029 and Guardian Phase 2 for the third quarter of 2030.
DT Midstream FIDs at a glance
| Project | Company-reported scope | Capital disclosed | Expected in-service timing |
|---|---|---|---|
| MIST S1 mainline expansion | Approximately 300 MMcf/d of incremental Midwestern Gas Transmission capacity through compression and looping | Combined with the power-plant lateral: $275 million–$325 million | Fourth quarter 2029 |
| Midwestern power-plant lateral | New pipeline lateral to serve a planned 900-MW power plant in Indiana | Combined with MIST S1: $275 million–$325 million | First half 2028 |
| Guardian Pipeline Phase 2 modernization | Second phase of Guardian’s modernization program, intended to support system efficiency and reliability | $130 million–$150 million | Third quarter 2030 |
What DT Midstream approved on Midwestern Gas Transmission
DT Midstream said the MIST S1 mainline expansion will add approximately 300 MMcf/d of capacity, or about a 20% increase in total Midwestern capacity. The company said the expansion will use a combination of compression and looping and is supported by precedent agreements with investment-grade utilities under 20-year negotiated-rate contracts.
The company also approved a new lateral from Midwestern to serve a planned 900-MW Indiana power plant. DT Midstream said that lateral is backed by a 20-year, demand-based agreement with a utility offtaker. The two Midwestern projects share the disclosed $275 million–$325 million capital range; DT Midstream did not disclose how much of that range applies to the mainline work versus the lateral.
The announcement supports a specific link between incremental natural-gas transportation infrastructure and power-generation demand in southern Indiana. It does not identify the power-plant developer, plant location, lateral length or diameter, interconnection configuration, specific shipper, construction sequence or contractor team.
Courtesy of DT Midstream
Guardian Phase 2 moves into execution
Guardian Phase 2 modernization reached FID with a disclosed $130 million–$150 million capital range and a third-quarter 2030 expected in-service date. DT Midstream described the investment as part of continued modernization work intended to enhance system efficiency and reliability. The company said capital for the modernization program is expected to be recovered through pipeline rate cases.
DT Midstream did not disclose the individual facilities, compressor-station work, pipe replacements, automation upgrades, equipment packages or construction segments included in Phase 2. The FID establishes that the company has approved the investment; it does not establish that each potential sub-scope has been designed, permitted, procured or awarded.
Allstream perspective: What could be involved if these projects move into execution?
Allstream perspective: Final investment decisions convert these projects from a development pipeline into company-approved capital programs, but the available disclosures remain at a high level. For a gas-transmission expansion using compression and looping, a new power-plant lateral and a pipeline modernization project, the following categories could be involved as engineering and construction packages are later defined. They are potential supply-chain and service categories—not DT Midstream awards or confirmed procurement opportunities.
| Potential work area | What could be involved with projects of this type |
|---|---|
| Engineering and project development | Route and hydraulic studies; survey and geotechnical work; civil, mechanical, electrical and instrumentation design; permitting; right-of-way support; project controls; procurement and construction management |
| Pipeline and station materials | Line pipe, bends, fittings, flanges, coatings, launcher and receiver equipment, block valves, actuators, station piping, regulators, meters, filtration and pressure-control equipment |
| Compression, power and controls | Compressor packages, drivers or motors, auxiliary skids, electrical distribution, motor-control equipment, variable-frequency drives where selected, analyzers, instrumentation, communications, SCADA and automation systems |
| Pipeline construction and rehabilitation | Right-of-way preparation, grading, trenching, pipe stringing, bending, welding, non-destructive examination, field-joint coating, lowering-in, tie-ins, hydrostatic testing, restoration, integrity work and construction inspection |
| Crossings and civil scope | Horizontal directional drilling where route conditions require it, road and water crossings, access roads, drainage, foundations, structural steel and station-site civil work |
| Specialty field services | Equipment rentals, lifting and rigging, scaffolding, insulation, coating and painting, temporary power, hydrotest-water handling, dewatering, waste services, site logistics and workforce support |
Not every category will apply equally to every project. Compression and looping are specifically identified for MIST S1, while Guardian’s detailed modernization scope has not been published. Similarly, pumps are not a central element of the disclosed natural-gas transmission work; they could arise in ancillary station systems or temporary hydrotest and dewatering services, rather than as a confirmed mainline scope.
What the FIDs signal for the midstream market
The Midwestern approvals pair a long-term gas-transportation expansion with a new power-generation load, while Guardian Phase 2 extends a reliability-focused modernization program into 2030. The projects provide defined investment ranges and in-service targets, which gives the industrial market more commercial visibility than an open season or preliminary customer discussion.
However, the current disclosure does not identify bids, awarded contractors, manufacturers, pipe specifications, compressor horsepower, mileages, meter-station design, project locations beyond the broad areas identified, or construction start dates. The next decision-useful disclosures would be detailed regulatory filings where required, engineering and construction awards, equipment orders, final route or station information and project-level execution schedules.
