Pipeline Throughput: Measuring Midstream Transport Volumes

Pipeline throughput is the physical volume of crude oil, refined products, natural gas, natural gas liquids, or other commodities transported through a pipeline system during a period.

A simple operating formulation is:

1Average Daily Pipeline Throughput
2= Total Volume Transported During Period
3÷ Days in Period

Depending on the commodity, issuers may report throughput in barrels per day, thousand barrels per day, million cubic feet per day, dekatherms per day, or another physical unit.

Throughput is not pipeline capacity

Capacity describes how much a system can transport under specified operating conditions. Throughput describes how much actually moved.

A pipeline rated for 1 million barrels per day can carry 700,000 barrels per day during a period. That would imply 70% utilization only if the stated capacity and throughput use compatible system boundaries and measurement conventions.

Capacity can also change with pressure, product mix, maintenance, expansions, line reversals, batching, and operating constraints.

Throughput is not committed volume

A customer may contract for transportation capacity without physically shipping the committed quantity.

That distinction matters when the contract includes a Minimum Volume Commitment or Take-or-Pay Contract. A midstream operator can receive contractual payments even when actual throughput is below the customer's commitment.

So these are separate analytical questions:

1Physical question: How much product moved?
2Contract question: How much volume or payment was committed?
3Economic question: What fee or margin did the operator earn?

Fee-based revenue can grow differently from throughput

Many pipeline contracts charge a fee per transported unit. In that simple case:

1Transportation Revenue
2≈ Throughput × Fee per Unit

But reported revenue can also reflect:

• reservation or demand charges;
• minimum-volume shortfall payments;
• tariff escalation;
• storage and terminal fees;
• product sales reported gross;
• fuel or loss allowances;
• equity-method ownership; and
• acquired or divested assets.

That is why throughput growth is not automatically revenue growth.

System boundaries matter

Issuers can report throughput for individual assets, operated systems, wholly owned assets, consolidated subsidiaries, or joint ventures.

Phillips 66, for example, reports NGL pipeline throughput using a stated ownership and operating basis. MPLX reports multiple transportation commitments and service categories across crude, refined products, and other logistics assets.

Before comparing two companies, check whether the reported figure includes:

• equity affiliates;
• third-party operated assets;
• intra-system transfers;
• gathering laterals;
• terminal movements; or
• only mainline transportation.

A simple example

Suppose a refined-products pipeline transports 24 million barrels during a 30-day month:

124,000,000 barrels ÷ 30 days
2= 800,000 barrels per day average throughput

If stated capacity is 1 million barrels per day, a simple utilization calculation would be 80%. That does not tell you whether the shipper paid for 800,000 barrels, 1 million barrels, or another contractual minimum.

Filing examples

MPLX's 2025 Form 10-K describes long-term fee-based transportation arrangements with minimum volume commitments and separately discloses transportation-service commitments. Phillips 66 reports NGL pipeline throughput as an operating highlight. ONEOK and Targa also discuss throughput and volume trends across transportation, fractionation, and processing assets.

Sources:

• MPLX 2025 Form 10-K
• Phillips 66 2025 operating results exhibit
• ONEOK 2025 Form 10-K

Bottom line

Pipeline throughput measures actual physical flow, not installed capacity, reserved capacity, committed volume, revenue, or profit. Preserve the commodity, unit, asset boundary, ownership basis, period, and contract structure before comparing midstream systems.

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