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Secondary Trading in the UK Capacity Market

The complete guide to trading capacity obligations after the auction

πŸ“ˆ What is Secondary Trading?

Secondary trading allows capacity providers to buy and sell their capacity obligations after the initial auction. This creates a flexible market where providers can manage their positions, handle plant outages, or allow new market entrants to acquire capacity without waiting for the next auction.

Key Point: Secondary trading is essential for market flexibility - it allows capacity obligations to move to where they can be delivered most efficiently.

All trades are logged on the EMR portal and automatically adjust monthly payments and penalty caps for both parties involved in the transaction.

πŸ“‹ Key Rules at a Glance

Trading Window

Opens once capacity agreements are issued and runs until one working day before a potential stress event.

Bilateral Trading

All trades are bilateral agreements between two parties - there is no central exchange or order book.

EMR Portal

All trades must be registered on the EMR portal to be legally effective and adjust payments.

Price Discovery

Prices are determined by bilateral negotiation - there is no published pricing mechanism.

Automatic Adjustments

Monthly payments and penalty caps automatically adjust based on registered trades.

New Entrants

Companies can acquire capacity without participating in the original auction.

🎯 Phase 1: Post-Auction Trading (Years 1-4)

Timeline: Immediately after auction results until delivery year

Primary Use Cases:

  • Portfolio Optimization: Companies can adjust their capacity positions based on changing business needs
  • New Market Entry: Companies that missed the auction can acquire capacity obligations
  • Risk Management: Providers can reduce exposure if they're concerned about delivery capability
  • Asset Sales: When power plants are sold, capacity obligations often transfer with them
Important: During this phase, trading is primarily about strategic positioning rather than operational needs.

⚑ Phase 2: Pre-Delivery Year Trading

Timeline: 12 months before delivery year begins

Key Activities:

  • Operational Planning: Providers assess their actual delivery capability
  • Outage Management: Planned maintenance schedules become clearer
  • Capability Adjustments: Fine-tuning based on updated plant performance data
  • Market Consolidation: Larger players may acquire smaller positions

Trading Intensifies Because:

  • Delivery obligations become more concrete and measurable
  • Operational constraints are better understood
  • Financial planning requires greater certainty

🚨 Phase 3: Live Delivery Year Trading

Timeline: During the delivery year, up to one working day before stress events

Critical Characteristics:

  • High Stakes: Failure to deliver during stress events results in significant penalties
  • Real-Time Decisions: Trading decisions must be made quickly as stress events approach
  • Operational Focus: All trading is driven by actual operational capability
  • Emergency Transfers: Last-minute transfers due to unexpected outages
Critical Timing: Trading closes one working day before a potential stress event - after this point, you must deliver or face penalties.

Common Scenarios:

  • Unplanned Outages: Plant failures require immediate capacity transfer
  • Fuel Constraints: Gas supply issues may prevent delivery
  • Weather Events: Extreme weather affecting plant availability
  • Grid Constraints: Network issues preventing power delivery

⚠️ Common Pitfalls to Avoid

Waiting Too Long to Trade

Many providers wait until the delivery year to address capacity shortfalls. By then, prices are typically much higher and options are limited. Early trading in Phases 1-2 usually offers better pricing and more counterparties.

Inadequate Due Diligence

Not properly verifying the counterparty's ability to deliver can result in cascade failures. If your counterparty can't deliver, you're still liable for the original obligation plus penalties.

Poor Documentation

Failing to properly register trades on the EMR portal or maintain clear contractual terms can lead to disputes and regulatory issues.

Ignoring Penalty Caps

Not understanding how penalty caps transfer with trades can result in unexpected financial exposure during stress events.

Seasonal Timing Mistakes

Stress events are more likely during winter months. Trading capacity away during summer at low prices only to need it back in winter at high prices is a common costly mistake.

❓ Frequently Asked Questions

Can anyone participate in secondary trading?

Only parties with capacity obligations or those who can take on such obligations can participate. New entrants must meet the same qualification requirements as auction participants.

How are secondary trading prices determined?

Prices are determined through bilateral negotiation. There's no central pricing mechanism, though market participants often reference auction clearing prices and current market conditions.

What happens to payments when capacity is traded?

Monthly capacity payments automatically adjust based on registered trades. The seller's payments decrease while the buyer's payments increase proportionally.

Are there restrictions on how much can be traded?

You can trade up to your full capacity obligation, but you cannot trade more than you hold. Partial trades are common and allowed.

What about penalty caps in secondary trading?

Penalty caps transfer with the traded capacity. The buyer assumes the penalty risk while the seller is relieved of it for the traded portion.