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Governance scenario

Interconnector Outage

A major interconnector trips during peak winter demand. NESO must manage the generation shortfall. Balancing frequency, prices and public communication.

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This is a fictionalised teaching scenario grounded in real institutional roles, published reforms, and current public-source context.

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Work through the decision path below. Each choice changes the route, the institutional trade-offs, and the metrics the scenario tracks.

Interconnector Outage

Step 1 of 2

NESO

Interconnector trips

A 2GW interconnector to the continent trips unexpectedly during 17:00 peak demand. System demand is 50GW. The trip was unplanned. NESO must immediately compensate for lost import capacity. Frequency has dropped to 49.5Hz and is heading below the automatic load shedding threshold of 48.8Hz. NESO must deploy emergency measures within minutes.

What is at stake

  • -If frequency drops below 48.8Hz, automatic blackouts will begin.
  • -Forcing generators online to replace lost import is expensive for consumers.
  • -If you demand-manage (ask suppliers to shed load), that causes direct harm to consumers.

What is your emergency response?

Current Metrics

System Security62
Affordability58
Stakeholder Trust62
Net Zero Progress65
Customer Protection62
Operational Efficiency60

Actors Involved

NESOOfgemGeneratorsSuppliersCitizens

Regulatory Context

Grid Code and System Operator Transmission Owner Code

Governance relationship map

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Operating loop breadcrumb

Governance→Planning→Operations→Outcomes→Evidence

Current focus: Rules and accountability

Legend

Governance and policy

Rules, remits, and accountability

Planning and investment

Connections, queue progression, and delivery planning

System operations

Real-time balancing and network operation

Market and consumer outcomes

Prices, settlement, reliability, affordability

Evidence and learning

Telemetry, assurance, and continuous improvement

Glossary

  • Dispatch

    Real-time instructions to increase or reduce generation or demand so supply stays in balance.

  • Balancing

    The continuous process of matching electricity supply to demand while maintaining system frequency.

  • Constraint

    A technical limit in the network that restricts how power can flow under current conditions.

  • Industry code

    A formal rulebook that defines obligations and processes for specific market and network activities.

  • Connection agreement

    The formal agreement setting technical and milestone conditions for connecting a project to the network.

  • Settlement

    The process that turns metered and contractual positions into final market cashflow outcomes.

  • Conformance gate

    A quality checkpoint that verifies whether data or implementation meets agreed standards.

  • LTDS

    Long Term Development Statement publication requirements for distribution network data.

Guided tour

Step 1 of 8

Who sets the rules?

Start with governance: policy direction, regulatory oversight, licences, and code obligations.

Why it matters: Newcomers should first understand where authority sits before interpreting operational decisions.

Open Ofgem licence and code guidance

Preparing system graph…

Use this map to keep scenario decisions anchored to policy, coordination, operational delivery, and evidence feedback relationships.

Sources and methodology

How this page was assembled

Scenarios are designed as regulator-safe teaching runs. Institutional roles, programme context, and cited reform pathways stay grounded in current public sources, while event details and numbers inside the run remain fictionalised unless explicitly evidenced elsewhere. This scenario is framed against Grid Code and System Operator Transmission Owner Code.

Last reviewed 18 March 2026

Primary sources

Ransford's Notes