The Market Is Not Gameable—It Is Broken
The UK energy regulator is rattling its sabers again. Ofgem recently issued a stern, finger-wagging warning to energy traders, cautioning them against "gaming" the electricity interconnector market. The mainstream financial press swallowed the narrative whole. They painted a picture of predatory algorithmic traders manipulating subsea cables to bleed British consumers dry.
It is a comforting fantasy for bureaucrats. It creates an easy villain. It is also entirely wrong.
What regulators call "gaming" is actually the market functioning exactly as it was designed. Traders are exploiting structural inefficiencies, price differentials, and capacity bottlenecks between the UK’s National Grid and continental Europe (the French RTE, Belgian Elia, and Dutch TenneT networks). When Ofgem threatens to punish traders for maximizing arbitrage across these links, they are not protecting consumers. They are suffocating the precise price signals required to keep the lights on.
I have spent years watching energy desks navigate cross-border capacity auctions. I have seen compliance teams panic over vague regulatory definitions while engineering teams try to balance grid frequencies that politicians do not understand. Here is the brutal reality: you cannot demand a free-market mechanism to allocate scarce transmission capacity and then criminalize the people who use price discovery to do it.
The Illusion of the Malicious Short Squeeze
The core of the regulator’s anxiety centers on day-ahead and intraday implicit allocation. Critics claim that sophisticated trading desks buy up interconnector capacity, withhold it, or execute wash trades to artificially spike localized prices, particularly during periods of low wind generation in the North Sea.
Let us dismantle that premise with basic market mechanics.
Interconnector capacity is largely governed by coupled markets via the Price Coupling of Regions (PCR) algorithm. In an interconnected grid, power flows automatically from the lower-priced zone to the higher-priced zone based on order books. For a trader to truly "game" this system to the point of market distortion, they would need to control a massive, monopolistic share of physical generation assets on both sides of the channel simultaneously.
They do not. The North Western Europe (NWE) day-ahead market is highly fragmented.
When spreads widen between the UK’s N2EX market and the European Power Exchange (EPEX), it is not a conspiracy. It is a mathematical reflection of physical reality.
- The UK has structurally higher carbon costs due to the Carbon Price Support (CPS) mechanism, which sits on top of the UK Emissions Trading Scheme (ETS).
- The UK grid suffers from massive internal transmission bottlenecks, specifically the B6 boundary between Scotland (where wind is generated) and England (where demand sits).
- Continental Europe possesses deep nuclear flexibility (France) and heavily subsidized solar capacity (Germany/Netherlands) that can flood the market during peak daylight hours.
When a trader buys cheap French nuclear power at €40/MWh and sells it into a stressed UK grid at £150/MWh, they are executing clean arbitrage. Ofgem calls this a risk to consumer welfare. In reality, that flow of power decreases the peak price in the UK. Without the trader chasing that spread, the UK grid would have to fire up ultra-expensive, high-emission open-cycle gas turbines (OCGTs) domestically, driving prices even higher.
The regulator is confusing the symptom with the disease. The volatility is the signal.
Why Enforced Liquidity Kills Efficiency
Imagine a scenario where a regulator forces traders to flatten their positions or caps the spreads they can capture on interconnector auctions. This is the logical endpoint of Ofgem’s current trajectory.
If you cap the financial reward for taking cross-border risk, you remove the incentive to hold capacity. Interconnectors like IFA-2, Nemo Link, and North Sea Link cost billions to build. They are funded either through cap-and-floor regimes—which guarantee a baseline return funded by taxpayers if revenues fall—or merchant models that rely entirely on market spreads.
By suppressing arbitrage profits under the guise of market monitoring, the regulator guarantees two outcomes:
- Private capital will abandon future interconnector infrastructure. Investors will not back multi-billion-pound subsea high-voltage direct current (HVDC) projects if their revenue model is subject to the whims of a nervous compliance committee.
- Grid balancing costs will skyrocket. National Grid ESO already spends billions annually on the Balancing Mechanism to manage localized constraints. If cross-border flows become rigid and unresponsive to real-time price signals, the system operator will have to pay domestic generators extortionate constraint payments to turn off or turn on.
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| THE VICIOUS REGULATORY CYCLE |
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| Ofgem threatens traders for capturing high cross-border spreads. |
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| Traders pull liquidity; cross-border flow becomes rigid/inefficient. |
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| National Grid must use expensive domestic Balancing Mechanism. |
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| Consumer energy bills rise to cover massive grid balancing costs. |
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To argue that curbing trading activity protects the consumer is economically illiterate. The risk premium does not vanish because a regulator issues a press release; it simply shifts from the trading desks to the consumer's monthly bill.
Dismantling the "People Also Ask" Mythos
The public debate around this issue is poisoned by flawed assumptions. Look at the questions routinely lobbed at energy experts and politicians, and you will see how deeply the misunderstanding runs.
"Don't interconnectors make the UK vulnerable to European energy crises?"
This question gets the direction of risk completely backward. The UK is not a passive victim of European grid strain; the UK is fundamentally reliant on European imports to meet its peak winter evening margins. During the 2022 energy crisis, when French nuclear availability plummeted due to stress corrosion cracking, interconnectors did not fail the UK. The price mechanism worked. Power flowed where it was valued most, preventing blackouts on both sides of the Channel. Vulnerability is not caused by the wire; it is caused by a lack of domestic dispatchable generation.
"Why can’t we just set fixed prices for interconnector power?"
Because physics does not care about fiat price controls. If the UK sets a fixed price for electricity flowing through the Viking Link from Denmark, and the Central European spot price spikes due to a sudden drop in wind output, power will instantly divert away from the UK toward Germany or Poland. Electrons follow the path of least economic resistance. A fixed price on an interconnector is an open invitation for a total blackout.
The Downside No One Wants to Face
To be fair, a completely unfettered arbitrage market has a dark side that free-market purists love to ignore.
When you allow algorithmically driven trading desks to maximize capacity usage based purely on short-term price signals, you introduce extreme, high-frequency volatility into the physical transmission system. HVDC converter stations are highly complex pieces of engineering. Rapid, unpredictable shifts in flow direction—ramping from 1.4 GW of export to 1.4 GW of import within a single settlement period—place immense thermal and mechanical stress on subsea infrastructure.
I have spoken with grid engineers who live in constant terror of converter station outages. When a link like IFA-1 goes offline unexpectedly due to a fire or equipment failure, the sudden loss of infeed can cause grid frequency to drop dangerously low.
So, yes, there is a physical cost to aggressive trading. But that is an engineering problem requiring grid-code modifications and ramping limits—not a moral failing by traders requiring a regulatory crackdown on profit margins.
Stop Policing Spreads, Start Fixing the Grid
If Ofgem actually wants to lower costs for British businesses and households, it needs to stop treating commodity traders like comic-book villains. The high prices observed on the interconnectors are not artificial constructs; they are a direct reflection of a structurally deficient energy policy.
Instead of hunting for phantom market manipulation, regulators must address the real distortions. Fix the flawed locational marginal pricing system. Build the onshore transmission lines needed to move Scottish wind power down to London without triggering massive constraint payments. Streamline the grid connection queue, which currently forces new battery storage projects to wait up to a decade just to plug into the network.
Traders do not create volatility. They reveal it.
If the truth hurts, fix the grid. Stop blaming the scoreboard because you do not like the score.
