Why the world’s best power grids still stop at the border

By Chidi Nwafor

On a clear morning in the German-Danish border town of Flensburg, wind turbines along the Jutland coast are spinning so fast that Denmark’s grid operator is paying neighbouring countries to take the surplus electricity off its hands. A few hundred kilometres south, in the industrial Ruhr valley, factories are throttling production because the power they need cannot get to them fast enough. The electrons are abundant. The turbines are modern. The transmission lines exist. And still, on this particular morning, Germany’s own grid cannot move enough power from its windy north to its hungry south, let alone absorb what Denmark is trying to give away.

This is not a story about renewable energy failing. It is a story about what happens after renewable energy succeeds. Denmark’s wind fleet did exactly what it was built to do. Germany’s grid, for all its engineering sophistication, was not built to receive the consequences of that success at the speed and scale the moment demanded. The bottleneck was never generation. It was never even the physical wire. It was the commercial and regulatory choreography that decides, minute by minute, who is allowed to move how much power across which line, at what price, under whose authority.

Most conversations about the energy transition still treat national borders, and the borders between utility service territories within a single country, as background scenery. The real drama, in this telling, happens inside power plants and battery factories. But increasingly, the decisive constraint on whether the transition succeeds is not what happens inside any single system. It is what happens at the seams between systems, where one grid operator’s authority ends and another’s begins, where one market’s price signals stop meaning anything to the market next door, and where decades of institutional habit have never had to answer the question of how to share abundance, only how to share scarcity.

Call this the Missing Middle of Interconnection, and it is the fifth and in some ways most structurally revealing manifestation of the pattern this series has been tracing. Nigeria’s grid crisis exposed a system integration failure inside one country. The gas flaring paradox exposed the absence of commercial machinery to convert a resource into power. Off-grid solar exposed the absence of financing and distribution systems needed to convert panels into access. Battery storage exposed the absence of market structures needed to convert electrons into reliability. Interconnection exposes something one layer up from all of these: even when a country solves its internal Missing Middle, it discovers a new one waiting at its borders.

The conventional wisdom holds that interconnection is fundamentally an engineering and financing challenge. Build the transmission line, secure the capital, and power will flow to wherever it is needed, smoothing out the intermittency of wind and solar across wider geographies. This belief is not wrong so much as dangerously incomplete. The world already has instructive counterexamples. The West African Power Pool has spent more than two decades building physical interconnection among member states, and yet cross-border trade remains a fraction of its technical potential, constrained not by copper but by mismatched tariff structures, unresolved payment guarantees, and the absence of a regional institution with the authority to dispatch power the way a single national operator would. The United States, despite possessing arguably the most sophisticated grid engineering on the planet, has a multi-year interconnection queue for new generation projects that in some regions now exceeds the time it takes to physically build the project itself, because the studies, cost allocations, and utility approvals required to connect a new plant to an adjacent system were designed for a world adding a handful of large plants a year, not thousands of distributed ones. India’s ambitious vision of a single interconnected grid stretching from the Gulf to Southeast Asia is technically plausible and commercially unresolved, because no framework yet exists for how a solar-rich exporting nation and a demand-rich importing nation share currency risk, curtailment risk, and political risk across a multi-decade asset life.

In every case, the wires are the easy part. What is missing is the institutional equivalent of a wire: a shared rulebook that lets one system trust another enough to depend on it. This is the deeper insight the Missing Middle framework has been building toward across this series. Physical infrastructure is a necessary condition for the energy transition, but it has never been the binding constraint. The binding constraint is always the invisible architecture of trust, contract, and coordination that determines whether physical capacity becomes usable capacity. Batteries do not deliver reliability; dispatch rules do. Gas does not deliver power; commercial offtake structures do. Panels do not deliver access; financing and maintenance ecosystems do. Transmission lines do not deliver security of supply; interconnection agreements, balancing mechanisms, and mutually enforceable settlement systems do.

What makes interconnection distinctive, and worth treating as its own category rather than a subset of grid integration, is that it is the one manifestation of the Missing Middle that cannot be solved unilaterally. A country can reform its own regulatory framework, restructure its own utility, and build its own storage market entirely through domestic policy will. It cannot, acting alone, create a functioning interconnection, because the entire value of the asset depends on a counterpart on the other side of the border making equally credible, equally durable commitments. This is why interconnection projects that look bankable on a spreadsheet routinely stall for a decade or more: the engineering risk is modest and well understood, but the political risk is compounded, since it now depends on the stability of two or more governments, two or more regulatory regimes, and two or more sets of institutional incentives that were never designed to be interoperable.

For institutional investors, this reframes how interconnection risk should be underwritten. The temptation is to price cross-border transmission the way one would price any other infrastructure asset, adjusted upward for a vague premium labelled “political risk.” That approach systematically misprices the asset, because the risk is not a discrete event but a continuous coordination burden that persists for the life of the project. What investors should be looking for instead is evidence of durable institutional plumbing: a regional system operator with real dispatch authority rather than advisory status, a settlement mechanism that has already survived a currency shock or a political transition, and a track record of curtailment decisions being resolved through pre-agreed rules rather than ad hoc negotiation. Where that plumbing exists, even in nascent form, interconnection assets deserve a materially lower risk premium than the market currently assigns them. Where it does not exist, no amount of concessional capital will make the wire trustworthy, because the wire was never the problem.

For governments, the misunderstanding runs in the opposite direction. Energy ministries tend to treat interconnection agreements as diplomatic afterthoughts, signed with ceremony once the engineering and financing are largely settled. The evidence from the power pools that have actually worked, most notably in parts of the Nordic and Central European market, suggests the sequence needs to be reversed. The institutional architecture, the shared grid code, the common balancing market, the dispute resolution mechanism, needs to be negotiated and stress-tested before large capital commitments are made, not after. Countries that build the wire first and negotiate the rules later are, in effect, constructing very expensive monuments to good intentions.

Three structural reforms would move this from aspiration to practice. First, regional development finance institutions should be mandated and resourced to fund institutional capacity, not just physical assets, treating the design of a credible regional system operator as seriously as the design of a substation. Second, interconnection agreements should include automatic, formula-based curtailment and compensation rules agreed in advance, removing the recurring temptation for either side to renegotiate terms unilaterally once the line is built and one party holds more leverage than the other. Third, procurement of new cross-border transmission capacity should be explicitly linked to the maturity of the underlying market institutions, so that capital is directed first toward corridors where the invisible architecture already exists, rather than toward whichever project has the most compelling engineering narrative.

None of this diminishes the importance of the physical grid. It simply relocates where the real work happens. The Missing Middle of Interconnection makes visible a pattern this series has been circling from its first instalment: at every scale, from a single mini-grid to a continental power pool, the technology has consistently outpaced the institutions built to govern it. Denmark’s turbines and Germany’s factories are not failing to connect because anyone lacks the will or the wire. They are failing to connect because nobody has yet built the shared rulebook that would let abundance on one side of a border become reliability on the other.

The countries and institutions that eventually lead the global energy transition will not be the ones with the most advanced turbines, the cheapest panels, or even the densest transmission networks. They will be the ones that learn, before their competitors do, that the last mile of the energy transition was never a wire. It was an agreement.

Nwafor is founder and lead strategist at De-Lazuli Consult and can be reached at chidi.nwafor@de-lazuliconsult.com, +2348094561290