On 2 June 2025 Enedis, the operator of most of the French distribution network, published the results of a call for local flexibility covering 58 zones. In 38 of those lots, the column that counts awardees reads zero. Only two firms appear as awardees anywhere in the table, NW Smart Grid Energy and Voltalis.
That table is the quietest document in this piece, and it overturns the idea we started with. We expected to find that the companies which aggregate flexible demand had become something the power system could not do without. The document shows the opposite: the position that matters belongs to the grid operator that runs the call, and the side that is supposed to answer it is still thin.
In the French power system, what cannot be substituted is not a firm’s size but a position that a law, a licence or a supply chain fixes: RTE and Enedis by designation and concession, EDF by nuclear licence, heat-network operators only inside a local concession, and heavy grid equipment by global lead times, while the local flexibility market, often named as the next dependency, is still too thin to be one.
This is the second piece of the energy chapter of the CareerOn Industry Atlas. The first asked where the money is made. This one asks a harder question: which companies could the system not replace inside a planning horizon, and what document says so? It reads eight dated documents from the energy regulator, the nuclear safety authority, the International Energy Agency, the distribution operator and the heat-network trade body. It treats each position by the kind of hold it is, never on one common scale, and it ends with three pieces of work a candidate can rehearse.
Why size is the wrong question
The usual way to name the companies an industry cannot live without is to rank them by revenue, output or market share. That list is easy to draw and it answers the wrong question. A large company can be replaced if others can do what it does. A small one can be impossible to replace if the law gives only it the right to do something, or if the equipment it needs takes years to make.
So this piece uses a stricter test. A company is indispensable here only where a document shows that no substitute exists within a period that matters to someone planning the system. The test has five forms, because a hold can come from five places: a statute, a concession, a licence, a supply chain or the right to coordinate others. Each form is evidenced by a different kind of document, and each is read only for what that document can prove.
The consequence is that the five positions below are not ranked against each other. A law that names a transmission operator and a factory that takes three years to deliver a cable are both constraints, but they are not the same kind of constraint and they cannot be put on one axis. Where a document prints how long a substitution would take, we print it. Where it prints nothing, the table says so.
Five positions a power system cannot route around, each held by a different kind of document
| Kind of hold | Who holds it | What the document fixes | Substitution horizon printed |
|---|---|---|---|
| Legal designation | RTE | Transmission operator created by law from EDF’s legal separation | None printed |
| Concession | Enedis, with local distributors | Distribution assets under concession; local distributors equalised through a national fund | None printed |
| Licence custody | EDF | Safety responsibility lies with the licensee of 56 reactors in operation, excluding the EPR | None printed |
| Qualified supply (global) | Cable and large-transformer makers | Lead times almost doubled since 2021 | Cables: up to two or three years |
| Local concession | Heat-network operators | 1,000 networks; each authority chooses direct management or a concession | None printed |
Sources 1 Commission de régulation de l’énergie (CRE) · 2 Commission de régulation de l’énergie (CRE) · 4 Autorité de sûreté nucléaire et de radioprotection · 3 International Energy Agency · 7 FEDENE Réseaux de chaleur et de froid (SNCU)
A position written into law
The Commission de régulation de l’énergie, the French energy regulator, set the transmission tariff known as TURPE 7 HTB in a decision dated 13 March 2025. The decision describes the operator of the public transmission network as the company that came out of the legal separation imposed on Electricité de France by the energy code. That company is RTE.
This is the plainest kind of hold. Nobody else may run the high-voltage network, and the reason is not that RTE is large but that the law designates it. The same decision adds something useful for the rest of this piece: it says that the national use of flexibility by RTE to balance supply and demand is already widespread and largely open to new flexibility capacity. At national level, then, flexibility is not a gap.
What the decision does not tell you matters as much. It does not measure how well RTE operates the network, and it prints no period in which a substitute operator could be found. A designation in law can in principle be changed by law. The claim we make is narrower: inside any horizon that a planner of the system works with, there is no second transmission operator to turn to.
A position held by concession
A second decision the same day, on TURPE 7 HTA-BT, covers distribution. It refers to the provisions that Enedis builds up to renew the assets it operates under concession, and it records that the gap between the costs and tariff revenues of the local distribution companies is equalised through a national fund.
Two findings follow. Distribution is held under concession, which is a different legal form from the transmission designation, and it is not held by Enedis alone: local distributors run networks in their own areas, with their costs balanced through the fund. The tariff decision prints no share for Enedis, and we do not read one into it.
An earlier decision of the same regulator does print a split, and it measures something precise. In a decision dated 10 June 2021, the regulator wrote that on the distribution network in mainland France about 95% of final electricity consumers were served by Enedis, and the remaining 5% were connected to networks run by more than a hundred local distribution companies. That is a count of consumers four years before the tariff decision. It is not a share of the network, of the energy delivered or of revenue, and it is not a current figure. It confirms the shape of the position, one national concession holder beside many local ones, without turning it into a ranking.
A position held by licence
In its report on nuclear safety in France in 2024, published on 22 May 2025, the nuclear safety authority restates the principle that responsibility for the safety of nuclear activities lies with those who carry them out. It describes EDF as the licensee of the nuclear power plants. The same report counts 56 reactors in operation, excluding the EPR.
This hold is often described as a matter of output: EDF produces most of the country’s electricity, so it is indispensable. That is the size argument again, and this piece does not use it. The report carries no output figure. What it does establish is custody. The licence places the legal responsibility for the safety of each reactor on one named licensee, and that responsibility cannot be handed to a buyer, a supplier or a contractor.
For someone choosing where to work, custody is the useful word. It means a large share of the work on those sites exists to discharge obligations that sit with the licensee: environmental monitoring, discharge limits, reporting to the regulator. The report does not tell you EDF’s commercial position or the cost of any alternative, and neither do we.
A position held by the supply chain
The fourth hold is the only one in this piece that comes with a printed horizon. The International Energy Agency, in a report published on 25 February 2025, finds that average lead times for cables and large power transformers have almost doubled since 2021. For cables, it says, they now extend up to two or three years depending on the complexity of the project, against one or two years a few years ago.
The same report says the top ten cable manufacturers account for around 50% of the global market. That is a concentrated market, but it is not a monopoly, and the figure is global. The agency names no French supplier, and nothing in the report shows that any single manufacturer is impossible to replace. What it does show is that for anyone planning to connect a factory, a data centre or a wind farm, the cable and the transformer are now on the critical path.
This is why we describe the position as held by a supply chain rather than by a company. The constraint is real and it has a length. It is not a name.
A position held by a local choice
The survey of heat and cooling networks published in November 2024 by FEDENE’s heat-network branch counts 1,000 networks in France. It also explains who decides how each one is run. Local authorities choose freely between managing the service themselves and entrusting it to a third party through a concession or a public service delegation.
That makes this the most conditional position of the five. An operator of a heat network holds something close to a local monopoly, but only where an authority chose a concession, and only for the term of that concession. Where the authority runs the service directly, there is no operator to depend on. The survey counts networks and forms of management. It names no operator’s share and cannot be used to rank one operator above another.
The dependency that is not there yet
Which brings us back to the table we opened with. If any new position were going to join these five, the obvious candidate was local flexibility: firms that pay households and businesses to shift or cut their consumption at the moment a local part of the grid is under strain. Enedis buys that service through calls for tenders, zone by zone.
Enedis ran the call; in the first 2025 round, most lots found no one to answer it
| Round | Zones tendered | Lots without awardee or offer | Awardees named |
|---|---|---|---|
| 2025 S1 | 58 | 38 without awardee | NW Smart Grid Energy, Voltalis |
| 2025 S2 | 8 | Four without offer, extended to 2 January 2026 | Not counted here |
The first round of the year is the one counted above. The figure of zero awardees in most lots is not a phrase in the document. It is read from the printed column, one value per lot, by a script that downloads the published results and checks that every lot was read. The later round confirms the pattern on a smaller scale. The second call of 2025, published with its results on 16 January 2026, covered 8 zones. Four lots drew no offer and were extended to 2 January 2026.
The reading we admit is limited. In these calls, the position that coordinates flexibility belongs to the distribution operator, which defines the zones, runs the call and records the result. The firms that might answer are few. The reading we refuse is just as important. Neither document says why bidders stayed away, and a thin call is not proof that flexibility cannot be found, that the price was too low or that the market will stay small.
The counter-case
The strongest objection to this piece is that none of these positions is permanent. The state could re-tender distribution concessions, rewrite the law on transmission or change how nuclear sites are licensed. That is true over a long enough horizon. Our claim is only that inside the period in which the system is planned, no substitute exists, and where a document prints no period we print none.
A second objection is that we have understated EDF by leaving out its output. We have left it out on purpose. Output is a measure of size, and size is the argument this piece set out to test rather than assume.
A third is that the equipment constraint is global and says little about France. We agree, which is why every sentence that uses it says it is global and names no French supplier.
The fourth is the one we cannot settle. A thin flexibility market may simply be a young one, and the firms that answered these calls may become the dependency we expected. Both readings are live. The evidence here does not decide between them, and we say so rather than choose.
A last check applies to the company documents themselves. A call for tenders published by Enedis is evidence of what Enedis did: that it ran the call and what it received. It is not evidence of Enedis’s importance, and we have not used it that way.
What each document proves, and where it stops
| Document | Proves | Does not prove |
|---|---|---|
| CRE, TURPE 7 HTB (13 March 2025) | Who operates transmission | Quality of operation; how long a substitute would take |
| CRE, TURPE 7 HTA-BT (13 March 2025) | Distribution runs under concession, beside local distributors | Any national market share |
| IEA transmission supply chains (25 February 2025) | Global lead times and cable-maker concentration | Any French supplier; that one maker is irreplaceable |
| ASN 2024 report (22 May 2025) | Safety responsibility and licensee status | Commercial position, output, cost of alternatives |
| Enedis tender 2025 S1 (2 June 2025) | Lot counts and named awardees of one call | The wider flexibility market; prices |
| Enedis tender 2025 S2 (16 January 2026) | Four lots drew no offer in the first window | Why; that flexibility is unavailable |
| FEDENE/SNCU survey (November 2024) | Network counts and governance forms | Any operator’s share or rank |
| CRE, competition on ELD territories (10 June 2021) | How final consumers split between Enedis and local distributors in 2021 | A share of network, energy or revenue; a current figure |
Sources 1 Commission de régulation de l’énergie (CRE) · 2 Commission de régulation de l’énergie (CRE) · 3 International Energy Agency · 4 Autorité de sûreté nucléaire et de radioprotection · 5 Enedis · 6 Enedis · 7 FEDENE Réseaux de chaleur et de froid (SNCU) · 8 Commission de régulation de l’énergie (CRE)
What would change the reading
Three things would move this map. A regulatory decision that printed a period in which a distribution or transmission function could be transferred would give those positions a horizon they do not have today. A published survey of European cable or transformer capacity naming suppliers and delivery times would let the supply-chain hold be stated at the level of a country rather than the world. And a later round of Enedis calls in which most lots found an awardee would show that local flexibility has become a market with enough depth to depend on. Until one of those appears, the map stays where the documents put it.
What this means for your career
If what cannot be replaced is a position rather than a size, then some of the most durable work in energy is the work of holding those positions: discharging the obligations of a licence, running the calls that coordinate a local grid, and operating a service under a concession. The documents point to three such tasks, and CareerOn has a simulation for each.
The first is custody of a nuclear licence. The safety authority places responsibility on the licensee, and the environmental manager of a nuclear site is one of the people who turns that responsibility into daily practice: monitoring, limits, reports. The source documents the responsibility. It does not tell you how many such roles exist or what they pay.
The second is coordination of a local grid. Running a flexibility call means defining the zones, setting the terms, reading the offers and deciding what to do when none arrive, which is exactly the situation the Enedis tables record. That is the work of a smart-grid and local flexibility project lead.
The third is a local concession. An authority that entrusts its heat network to an operator is buying a service with obligations attached, and the project lead of an urban heat network is the person who has to meet them. The survey shows how the service can be governed. It does not say which operator is best placed.
If you want to work where safety responsibility is held, start with the nuclear site environmental manager simulation. If you want to learn how a local grid asks for help and what happens when nobody answers, start with the smart-grid and local flexibility project lead simulation. If you want to run a public service under concession, start with the urban heat network project lead simulation. None of these documents tells you how many jobs there are, and we do not pretend otherwise. Each simulation lets you do the work before you choose it.