# Mapping the players: from national champions to nimble challengers
In 2021, when UK wholesale gas prices spiked, more than 30 British energy retailers collapsed in under a year. Octopus Energy survived and grew. National Grid, which owns the wires and pipes, barely felt the shock. And EDF, the French state-backed giant, kept generating power from its nuclear fleet regardless of who was selling it. Same crisis, three completely different outcomes. Why? Because each company sits on a different part of the energy value chain, and each part has a different risk, margin, and power profile.
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Electricity and gas move through four broad stages before they reach your meter:
1. Generation / production: making the electricity (power plants, wind farms, nuclear) or extracting the gas.
2. Transmission: moving energy long distances at high voltage or high pressure (the motorways of energy).
3. Distribution: stepping it down and delivering it locally to homes and businesses (the local roads).
4. Retail / supply: the company that bills you, manages your account, and buys energy on your behalf.
A vertically integrated company owns several of these stages. A pure-play company specialises in just one. This single distinction explains most of the power dynamics in the sector.
EDF (Electricite de France) is majority owned by the French state, which took it fully public into state hands in 2023. It generates power (it operates France's large nuclear fleet), and it also sells electricity to end customers in France and, through EDF Energy, in the UK.
That breadth is its strength and its burden. EDF captures margin at multiple points: it earns from generating power *and* from selling it. When wholesale prices swing, an integrated player is partly hedged because a loss on one side can be offset by a gain on another.
But scale comes with heavy obligations. EDF carries enormous capital costs: building and maintaining nuclear reactors, plus projects like Hinkley Point C in the UK, which has faced well-documented cost overruns and delays. National champions are also politically exposed. In 2022, France capped retail price rises to protect consumers, and EDF absorbed much of the cost. That is the trade-off: privileged position, but the government can lean on you.
National Grid owns and operates transmission infrastructure in Great Britain and parts of the northeastern US. It does not sell you electricity, and it does not really compete for your business. It runs the wires.
Here is the key idea: networks are natural monopolies. It makes no sense to build three competing sets of pylons across the countryside. So instead of competition, networks are governed by a regulator that sets how much they can earn.
In Great Britain, that regulator is Ofgem (the Office of Gas and Electricity Markets). Ofgem uses a framework called RIIO (Revenue = Incentives + Innovation + Outputs), which caps a network's allowed revenue for a multi-year period and rewards it for reliability and efficiency. You can read Ofgem's own explanation of the model on the Ofgem RIIO price controls page.
The result: stable, predictable, regulated returns. National Grid rarely goes bust and rarely posts spectacular growth. It is the low-drama, low-margin-volatility part of the chain. That is precisely why it survived the 2021 price crisis untouched: it never took wholesale price risk in the first place.
Octopus Energy launched in 2016 and grew into one of the UK's largest suppliers, now serving millions of accounts and operating internationally. It owns almost no wires and, historically, little generation. It competes on the retail layer: customer experiencecustomer experienceThe overall perception a customer forms of your brand across every interaction, from first touch to post-purchase support.View full definition →, smart tariffs, and technology.
Octopus's real product is not electrons. It is Kraken, its software platform for managing customers, billing, and demand. Octopus licenses Kraken to other utilities globally, which turns a retailer into a technology vendor. That is a classic challenger move: find a high-margin, capital-light niche next to a low-margin commodity.
But the retail layer is brutally exposed. Retailers buy energy on wholesale markets and sell it at capped or fixed prices to households. In the UK, Ofgem sets a price cap limiting what suppliers can charge on standard tariffs. When wholesale prices exploded in 2021, retailers who had not hedged were selling below cost. Dozens failed. Retail is where competition is fiercest, margins are thinnest, and the barrier to entry is lowest.
Think of the chain as a set of buckets, each with a different risk and reward profile.
| Stage | Example player | Competition | Margin character |
|---|---|---|---|
| Generation | EDF nuclear fleet | Moderate (merchant + contracts) | Volatile, capital-heavy |
| Transmission | National Grid | None (regulated monopoly) | Low but stable, regulated |
| Distribution | UK Power Networks | None (regulated monopoly) | Low but stable, regulated |
| Retail | Octopus | Intense | Thin, volatile |
A rough rule of thumb: the parts of the chain with the *least* competition (the regulated networks) have the most *stable* returns, while the parts with the *most* competition (retail) have the *thinnest and most fragile* margins.
Imagine a household electricity bill of 100 units of currency. A commonly cited breakdown for a typical GB bill (this is an illustrative estimate, and the exact split changes each year with Ofgem's cap decisions) looks roughly like this:
Notice the supplier's slice: often estimated in the low single digits as a percentage of the bill. That is why a retailer serving millions of customers can still be fragile. A small move in wholesale prices can wipe out that thin margin entirely. The network operator, by contrast, gets its ~20 units through a regulated mechanism largely insulated from wholesale swings.
Who holds leverage over whom?
Knowledge check
1. During the 2021 UK gas price spike, National Grid was largely insulated from the shock while dozens of retailers collapsed. What does this difference primarily illustrate?
2. Why is a vertically integrated player like EDF described as 'partly hedged' against wholesale price swings?
3. A company specializes solely in retail/supply, billing customers and buying energy on their behalf, without owning generation. This is best described as:
4. Select ALL correct answers. Which statements accurately describe implications of a company being vertically integrated across the energy value chain?
Select all the correct answers.
5. Select ALL correct answers. Based on the four-stage value chain, which activities belong to the 'transmission' and 'distribution' stages rather than generation or retail?
Select all the correct answers.
The neat archetypes are blurring. Three forces are pushing players across the chain:
Renewables reshuffle generation. Wind and solar have near-zero fuel cost but high upfront capital cost and intermittent output. This changes who wins in generation and makes flexibility (batteries, demand response) valuable, an area where nimble players like Octopus compete directly with giants.
Retailers integrate backward. Burned by 2021, several retailers now secure their own generation or long-term power purchase agreements (PPAs) to reduce wholesale exposure. Octopus, for instance, has invested in generation and flexibility, edging toward the integrated model it once undercut.
Networks face a demand surge. Electric vehicles, heat pumps, and data centres are driving huge new electricity demand. That makes network investment central to the energy transition, and puts network operators like National Grid at the heart of the buildout, with regulators deciding how fast and how profitably they can expand.