Inside Infrastructure: Hybrid Equity and the changing shape of Infrastructure Finance
Infrastructure businesses have always faced a version of the same problem – they need huge amounts of capital over long periods, but the moments when that need is most acute are often the moments when the conventional financing routes are least attractive:
- More debt risks a ratings downgrade or trips a covenant.
- A new equity partner means handing over a slice of control that no sponsor wants to give away.
- A public listing is a major undertaking with its own timing constraints and disclosure obligations (see our last Inside Infrastructure blog here).
For a long time, those were broadly the options. That is changing. Investment grade capital solutions are becoming an increasingly visible feature of the infrastructure financing landscape, sitting within a broader shift toward alternative capital structures designed to give companies and sponsors room to manoeuvre that conventional markets simply do not offer.
Hybrid equity is one of the most consequential of those structures — and in this instalment of Inside Infrastructure, we unpack the structure increasingly being used to close that gap:
- The market forces that have turned hybrid equity from a niche idea into a serious financing tool.
- How the structure fits together, from the joint venture vehicle through the holding stack to the cash waterfall.
- The terms that matter — ranking, payment mechanics and the equity-like governance rights that set hybrid equity apart from conventional debt.
- What to watch — the diligence, conflicts and regulatory issues investors should not overlook.
Why is this happening now?
The timing is not coincidental. Two things have converged to create the conditions for hybrid equity's emergence as a serious financing tool.
- The first is straightforward: infrastructure is getting more expensive. As platforms scale, development pipelines lengthen and the energy transition demands ever larger pools of patient capital, the gap between what traditional financing can deliver and what infrastructure businesses actually need has widened considerably.
- The second is the quiet transformation of the insurance sector. Asset managers acquiring insurers have unlocked large pools of long-term capital that is structurally well suited to investment grade risk and long-duration cashflows — exactly the kind of exposure that infrastructure assets with stable revenues, regulated cashflows or long concession lives can provide. Hybrid equity offers a structure through which that capital can be put to work.
How does it actually work?
At its core, a hybrid equity structure begins with the infrastructure company and its lead sponsor establishing a joint venture vehicle. That vehicle issues an equity stake to a special purpose vehicle (the bidco) controlled by the sponsor. The company and the bidco then enter into long-term agreements regulating governance and economic returns, calibrated to the nature of the underlying assets.
Above the bidco sits a stack of holding vehicles, with an orphan special purpose vehicle (typically an offshore charitable trust) at the top. The SPVs between the bidco and the orphan, issue investment grade securities, often tranched into senior notes, junior notes and equity notes. The proceeds fund the bidco's stake in the joint venture and, in some cases, future capital expenditure.
Cash generated by the infrastructure asset flows upward through the structure and is applied through an agreed waterfall at bidco level. More on this below.
What do the terms actually look like?
1. Payment mechanics and waterfall
Hybrid equity ranks lowest in seniority within the bidco's financing stack. Senior debt is serviced first, junior debt second. The hybrid equity instrument sits below both, and is serviced from the residual cash that remains, subject to its own terms and conditions. Nothing flows to the orphan SPV.
Payments are either discretionary or fixed, but calculated by reference to available residual cash rather than on the basis of a hard payment obligation. The instrument is typically perpetual in form — though structures almost always include incentives for early call, refinancing or redemption after a specified period. Those incentives matter: no investor wants to be indefinitely locked into an instrument where cash payments are at the discretion of the structure.
Payment terms mirror the mechanics agreed between the infrastructure company and the bidco, but only up to a point. If the infrastructure company needs the instrument to avoid being treated as additional debt for ratings or accounting purposes, fixed payments are off the table. Payments must be discretionary and must carry real downside exposure. The difficulty is that co-investors are looking for something closer to a debt return than an equity one. Ratchets and other structural incentives bridge that gap, tipping the economics toward earlier payment without crossing the line into the fixed obligations the structure cannot accommodate.
2. Governance mechanics
What distinguishes hybrid equity from conventional debt, however, is not just where it sits in the waterfall. It is the governance mechanics. Traditional debt instruments rely on covenants, events of default and creditor remedies to protect the holder. Hybrid equity holders get something different: equity-like governance rights. That distinction is fundamental to understanding both the appeal and the complexity of the instrument.
Governance arrangements for the joint venture vehicle vary considerably depending on the size of the bidco's investment and the sector in question. A minority position might bring limited board representation and consent rights over material events, new equity issuances, additional debt, significant mergers and acquisitions, change of control events, insolvency proceedings and affiliate transactions. Where the bidco is the primary capital provider into a development stage project, the governance package may look much more substantial – up to 50% board representation and consent rights extending well into operational territory.
Those governance rights operate in a very different context from a conventional equity joint venture. In a traditional joint venture, governance rights track shareholding thresholds (the more you own, the more say you get, roughly in proportion to your economic interest).
In a hybrid equity structure, the lead sponsor has to decide at the outset how much control it is willing to hand over to hybrid equity co-investors, both within the holding stack and in terms of any pass-through of governance rights the bidco holds at the company level. That decision, made at the start of negotiations, has consequences that echo through the entire structure. The lead sponsor will typically:
- Push for robust minority governance rights and meaningful exit protections at the company level, and the discretionary return profile makes those protections all the more important.
- But stop short of acquiring joint control over the joint venture vehicle, since crossing that line risks the equity treatment the structure is designed to achieve on the infrastructure company side.
Striking the right balance means navigating accounting, tax and ratings constraints that frequently conflict with one another, and doing so on both sides of the structure simultaneously. The sponsor must satisfy its own requirements while keeping its co-investors' interests in view; such co-investors will often need the instrument to carry a credit rating, as is typically the case where insurance capital is the source of funding.
Hybrid equity investors will also want a structure that regulates how holders of instruments with characteristics of senior and/or mezzanine debt (i.e. on the basis of their priority ranking in the cash waterfall and security) can make decisions. Clearly, holders of such senior/mezzanine instruments will want decision-making priority (against hybrid equity investors) for defaults and enforcement; but for other decisions, hybrid equity investors will want a framework that promotes positive decision-making (for example as to quorum and majority thresholds).
What should investors focus on?
1. Diligence is harder than it looks
Investing in hybrid equity is not the same as a conventional equity co-investment, and the diligence burden reflects that difference. Prospective investors need to understand in granular detail what governance rights the bidco is entitled to under its joint venture with the company, because the lead sponsor will typically propose, at the outset of negotiations, that only a portion of those rights are passed through to hybrid equity holders.
There is an added layer of complexity here. A prudent investor needs to examine not only the underlying infrastructure asset but also the lead sponsor's holding structure. Understanding how the proposed governance framework for hybrid equity holders sits alongside the framework already built into the constitutional documents of the holding stack, diverging from a traditional holding company structure, and any arrangements with the charitable trust requires careful analysis. Gaps in that diligence become expensive problems once the deal is done.
2. Conflicts of interest deserve serious attention
Hybrid equity structures carry a heightened risk of conflicts of interest that investors should not underestimate.
The lead sponsor is unlikely to commit to holding a minimum percentage of the hybrid equity indefinitely. Its economic interests and those of the hybrid equity holders may therefore diverge over time. As the lead sponsor typically retains the right to exercise key governance rights regardless of its remaining exposure to the instrument, there is a real possibility that those rights are exercised, at some future point, in a manner that benefits the lenders providing traditional debt financing rather than the hybrid equity holders.
The practical response is to negotiate for non-governance protections alongside the governance package, which include tag rights on any significant transfer of hybrid equity by the lead sponsor. Such rights will not cure the conflict, but they are a meaningful constraint.
3. The regulatory dimension
Hybrid equity investment can attract regulatory scrutiny, and the infrastructure sector is particularly exposed to that risk. Assets that are regulated, or subject to foreign investment controls, public interest regimes or sector-specific ownership restrictions, bring an additional layer of analysis that cannot be left until late in the process.
Regulators look through labels. An instrument described as debt will not necessarily be treated as debt for ownership or control purposes. What matters is the degree of influence it confers. Where that influence is meaningful, the holder may be treated as exercising control regardless of how the instrument is documented. Regulatory engagement needs to begin early in the structuring process, not once the deal is substantially agreed.
Where does this leave us?
Hybrid equity solves a problem that conventional financing cannot. Additional debt brings constraints. New equity means dilution. Hybrid equity offers something neither can: capital on terms that work for the business, the sponsor and the investor at the same time.
While the flexibility of hybrid equity makes it attractive for investors and infrastructure companies, it brings an added layer of complexity. The governance mechanics, the sponsor control framework, the management of conflicts and the regulatory overlay all require a level of bespoke structuring and experienced negotiation that goes well beyond what standardised financing documents are built to handle. These are not transactions to approach lightly, and they are not transactions where cutting corners in diligence or documentation tends to end well.
The direction of travel is clear: infrastructure needs more long-term capital than conventional markets can supply. Insurers and other long-duration investors need structured access to exactly the kind of stable, cashflow-generating assets that infrastructure provides. Hybrid equity sits at that intersection and the market for it is still in its early stages. However, the firms and investors who take the time to understand these structures properly now will be considerably better placed to use them when the opportunity arises.
