Pipe Dreams
A four-factor framework for energy infrastructure
There is a useful exercise that anyone who covers the energy infrastructure sector should perform from time to time. Take a list of the largest American midstream master limited partnerships — Enterprise Products Partners, Energy Transfer, MPLX, Western Midstream, Plains All American — and ask a roomful of generalist equity investors how they would go about valuing them. The answers will fall into two camps. The first will quote yield. The second, marginally more sophisticated, will quote EV/EBITDA. Both camps will, almost without exception, miss what these businesses actually are.
The problem is partly structural. Midstream MLPs sit at an awkward intersection of asset classes. They look like utilities, but their cash flows are not regulated in the way most utility revenue is. They look like REITs, but they own pipelines rather than buildings, and they are exposed — at the margin — to commodity prices in a way that no apartment block ever is. They look like energy stocks, but the bulk of their EBITDA comes from contracts whose pricing has nothing to do with WTI or Henry Hub. They are, in short, hybrid creatures, and the standard valuation metrics treat them as one or another of their constituent species rather than as the chimeras they actually are.
The result is a sector that has, on a multi-decade view, generated equity-like returns with bond-like volatility — the Alerian MLP Index has compounded at double-digit annualised rates over five and ten-year horizons, with a current yield of approximately 7.5% — and yet trades persistently at multiples that imply something else entirely. The discount has narrowed since the lows of 2020. It has not closed. We think we know why.
In what follows, we set out the inadequacies of the standard valuation toolkit and propose a four-factor proprietary framework that, in our view, captures what midstream MLPs actually are: hybrid income vehicles whose value derives less from their distributions than from the strategic, contractual and structural characteristics of the assets that produce them.
Why the standard metrics fail.
Begin with yield. For most of the period from 2010 to 2014, when the sector was in growth mode and capital markets were open, yield was a reasonable proxy for value. Four conditions held: distributions were paid out of organic cash flow; cash flows were predictable; growth capex could be funded externally; and unit prices reflected distribution expectations. By the time of the 2015–18 commodity rout, none of those conditions held reliably. Today, with the sector in a free-cash-flow inflection and a different ownership base, yield without context is a coin toss. Energy Transfer and Plains All American both yield over 8%. One has investment-grade credit and the bulk of its EBITDA fee-based; the other does not, quite. The yield does not tell you which is which.
Price-to-earnings ratios are worse than meaningless. They are actively misleading. Pipelines, when properly maintained, do not depreciate. They appreciate. The book depreciation that flows through GAAP earnings is an accounting fiction — a reflection of tax rules and historical cost accounting, not of any economic reality. Enterprise Products Partners’ Mont Belvieu salt caverns do not become less valuable as they age; they become more valuable, as fractionation capacity in the area becomes more constrained. Yet the partnership’s GAAP earnings are heavily depressed by depreciation expense, and its P/E multiple is therefore a function of accounting policy rather than business performance. Generalist investors who quote midstream P/E ratios are, almost without realising it, making category errors.
EV/EBITDA does better. It strips out depreciation, recognises that capital structure matters, and allows reasonable comparison across operators. But it is blind to the most important variable in midstream: contract quality. A dollar of EBITDA from a twenty-year take-or-pay LNG offtake contract with an investment-grade counterparty is not the same dollar of EBITDA as one earned from a percent-of-proceeds gathering contract with a small-cap Permian operator. The market knows this. EV/EBITDA does not capture it.
The MLP-native metric is P/DCF, or its inverse, distribution coverage — distributable cash flow divided by distributions paid. DCF, defined as EBITDA minus interest, minus maintenance capital expenditure, minus cash taxes, is genuinely informative. It captures the cash that can either be paid out to unitholders or reinvested without raising new capital. The leading midstream operators currently report distribution coverage of 1.5x to 2.0x; a decade ago, the same names were running at 1.0x to 1.2x. That is one of the most important under-appreciated facts about the sector.
P/DCF is the right starting point. It is not, however, sufficient. It tells you nothing about the durability of the cash flows it describes, the strategic value of the assets that generate them, the exposure of the operator to structural demand growth, or the duration mismatch between long-life assets and shorter-tenor debt. To capture those, we need a proprietary framework. We propose four metrics, each of which addresses a distinct question that the standard toolkit cannot answer.
Factor 1 — Quality of Income Score (QIS).
The first question an investor in any income-producing asset should ask is: how durable is the income? In real estate, this is captured (imperfectly) by tenant credit quality and lease structure. In midstream, it requires four sub-components.
The Quality of Income Score combines, on a 0-to-1 scale: first, the percentage of EBITDA from fee-based contracts (i.e., not exposed to commodity prices); second, the percentage of fee-based EBITDA from take-or-pay or minimum-volume-commitment contracts (i.e., not exposed to throughput volumes); third, the percentage of those contracted revenues explicitly indexed to inflation, whether through the FERC Oil Pipeline Index, regulatory rate-base adjustments or contractual PPI escalators; and fourth, the weighted-average credit quality of the counterparties. The score is a composite — equally weighted for the lay reader, more sophisticatedly weighted in our internal models — and represents, in essence, the share of cash flow that is simultaneously commodity-insensitive, volume-insensitive, inflation-protected and credit-secure.
In practice, the leading large-cap midstream operators score in a band that has been migrating steadily upwards since 2018, as operators have systematically renegotiated contracts toward fee-based and take-or-pay structures. The sector mean has roughly doubled over the period. Hess Midstream, with over 90% MVC-backed revenue from a single high-quality counterparty, scores at the top of the range. Smaller gathering-and-processing names with significant percent-of-proceeds exposure score considerably lower.
The QIS matters because it is the variable that ultimately determines whether the cash flows that fund distributions are bond-like or equity-like. A 7% yield from an asset with a high QIS is a different security from a 7% yield with a low QIS. The market does not currently price this distinction efficiently. We think it eventually will.
Factor 2 — Strategic Asset Value (SAV).
Pipelines, LNG terminals, gas storage and gathering systems share a property that is rare in modern equity markets: they cannot easily be replaced. The Mountain Valley Pipeline, a 303-mile gas line connecting West Virginia to Virginia, took thirteen years to build and ultimately required an act of Congress to complete. The Trans-Alaska Pipeline could not be built today on any reasonable timeline. New interstate pipelines in the American Northeast face a permitting environment that varies between hostile and impossible. Greenfield LNG export facilities in the United States now require five-to-seven years from FID to first cargo, with capital costs that have risen approximately 40% since 2020. In Europe, the comparable timelines are longer still.
This means the listed midstream sector enjoys a form of barrier-to-entry that is increasingly rare in public equity markets — and largely absent from the valuation models used to price it. The Strategic Asset Value ratio captures it as enterprise value divided by an estimated replacement cost, with the replacement cost adjusted upward for what we call the “permitting impossibility premium” — the implied uplift required to reflect the fact that some of these assets simply could not be rebuilt under current regulatory conditions. We estimate the impossibility premium at between 1.3x and 2.5x, depending on jurisdiction and asset type. It is highest for new interstate pipelines in the American Northeast, lowest for greenfield gathering systems in the Permian Basin.
On this measure, the major US midstream operators are currently trading at SAV ratios meaningfully below 1.0 — meaning the market values them at less than the honest cost of recreating their asset bases. Comparable infrastructure in private hands has, in recent transactions, changed hands at SAV ratios closer to or above 1.0. The gap is the visible portion of the discount we mentioned at the beginning.
Factor 3 — Asset–Liability Duration Index (ALDI).
A typical interstate gas pipeline has a useful economic life of fifty to seventy years. A typical LNG export facility, properly maintained, has forty to fifty years. Underground gas storage assets — the salt caverns at Mont Belvieu, the depleted reservoirs at Aliso Canyon, the bedded salt at Bay Gas — can operate, with periodic recompletion, for over a century. The weighted average remaining useful life of the major US midstream operators’ asset bases is, by our estimate, between thirty-five and fifty years.
The weighted average duration of those operators’ debt is, by contrast, nine to twelve years.
This duration mismatch is a feature, not a bug. It means that an operator who finances 50-year assets with 10-year debt enjoys a structural rolling option to refinance at lower nominal rates as the asset base ages, even as the cash flows from those assets are escalating with inflation. The Asset–Liability Duration Index — weighted average remaining asset life divided by weighted average debt duration — therefore captures the “free option” embedded in long-life infrastructure financed at intermediate-tenor rates. The leading operators score in a band of three-to-five times. This is, in our view, the single most under-appreciated source of structural alpha in the sector. A high ALDI, in a world of accelerating inflation, generates a compounding tailwind that no GAAP financial statement directly displays.
Factor 4 — Demand-Indexed Income Score (DIIS).
The fourth factor addresses the question that yield-chasers tend to forget: where is the cash flow going to come from in fifteen years’ time? The Demand-Indexed Income Score is the percentage of an operator’s EBITDA tied to structural-growth themes — LNG export, gas-fired power generation, data-centre offtake, gas-to-chemicals — versus legacy or declining themes (mature-basin crude oil gathering, refined products distribution to declining demand centres).
The DIIS is forward-looking, necessarily an estimate, and the single factor most likely to drive multiple expansion over the next five years. A midstream operator with the majority of forward EBITDA tied to growth platforms should, in our view, trade at a meaningful premium to one whose EBITDA is anchored in structurally declining markets. The market is beginning to price this distinction. It has not yet priced it fully.
Putting it together.
A composite framework that combines QIS, SAV, ALDI and DIIS yields a four-dimensional profile of any given midstream operator. The sector’s standard valuation toolkit collapses these dimensions into a single yield or multiple. We think the dimensions deserve to be looked at separately.
The implications for portfolio construction are significant. Two operators trading at the same yield, with identical EV/EBITDA multiples, can have radically different four-factor profiles. One may have superior cash-flow durability, embedded scarcity value, structural inflation tailwind and forward growth optionality. The other may have none of those things. The market, currently, prices them similarly. We do not.
There is a temptation, when looking at a list of seven-percent-yielding pipeline partnerships in 2026, to conclude that one is being paid generously to own boring assets. The truth is the opposite. One is being paid generously to own assets that, viewed correctly, are anything but boring. They are, in fact, the most strategically valuable, most contractually secure, longest-duration, most inflation-protected, most demand-advantaged assets available in the public equity market — and they trade at a discount to comparable private market transactions of thirty to forty per cent.
The right question is not “what yield does it pay?” The right question is “what would it cost to rebuild?” The answer, in many cases, is: more than the market thinks.
EDITORIAL NOTE
These three essays form part of a series on the structural case for natural gas as an asset class. They are intended to underpin the investment thesis behind the Navigate Global Energy High Income Fund, a sub-fund of Navigate Funds SICAV plc (subject to final MFSA approval). The Quality of Income Score, Strategic Asset Value, Asset–Liability Duration Index and Demand-Indexed Income Score are proprietary analytical constructs developed by Navigate’s investment team and form part of the Fund’s QuadLogic-overlaid security selection process. The framework is illustrative; numerical estimates are directional and based on Navigate’s internal modelling unless otherwise stated.
Marketing communication. For professional and institutional investors only. Not a recommendation to buy or sell any security. Capital at risk.
