1. Introduction

Global electricity system coherence models refer to the legal, regulatory, institutional and technical arrangements designed to make interconnected electricity systems operate as a single coordinated system despite being divided among different countries, regulators, transmission operators, markets and legal jurisdictions.

Electricity creates a special governance problem because electrons do not respect political borders. A transaction between two countries can affect frequency, congestion, voltage stability, reserve requirements and system security in several other jurisdictions. Consequently, electricity-law systems increasingly require coordination of network planning, system operation, market rules, balancing, emergency response, data exchange and cross-border transmission.

The European Union provides the most developed example of this approach. Its system-operation framework establishes common requirements concerning operational security, frequency stability, energy quality, data exchange, common grid models and coordinated security analysis. (ACER)

At the global level, however, there is no single worldwide electricity regulator. Instead, coherence is produced through regional integration, international treaties, grid codes, regulatory cooperation, interconnector agreements and harmonisation of technical standards.

2. Meaning of Electricity-System Coherence

Electricity-system coherence can be understood through five dimensions:

Technical coherence – common technical standards for frequency, voltage, protection and grid operation.

Regulatory coherence – compatible rules among national electricity regulators.

Market coherence – compatible rules for cross-border trading, congestion management and balancing.

Institutional coherence – coordinated action by TSOs, regulators and regional organisations.

Legal coherence – mechanisms for resolving conflicts between national and regional electricity laws.

A coherent electricity system therefore does not necessarily require identical laws. Instead, the laws must be sufficiently compatible to permit reliable cross-border operation.

3. Major Models of Global Electricity-System Coherence

A. Centralised Supranational Model

Under this model, participating countries transfer significant regulatory authority to a regional institution.

The European Union is the principal example.

The EU electricity framework combines:

European Commission legislation;

ACER;

national regulatory authorities;

ENTSO-E;

transmission-system operators;

European network codes;

regional coordination centres;

cross-border market mechanisms.

The EU System Operation Regulation establishes common requirements concerning operational security, frequency, quality and efficient use of interconnected resources. It also provides for common grid models and coordinated operational-security analysis. (ACER)

Legal significance

This model reduces the problem of regulatory fragmentation because cross-border electricity operations are governed by common legal methodologies rather than entirely independent national rules.

4. Regional Coordination Model

A second model is regional coordination without complete supranationalisation.

Here, national regulators and TSOs retain substantial sovereignty but cooperate through regional institutions.

Regional Coordination Centres (RCCs) are an important example. EU legislation assigns them functions including:

coordinated security analysis;

common grid modelling;

outage coordination;

regional adequacy assessment;

reserve-capacity coordination;

identification of transmission-capacity needs;

crisis-scenario identification. (ACER)

This demonstrates an important principle:

Electricity governance increasingly follows the physical geography of interconnected networks rather than national political boundaries.

5. Market-Coupling Model

Another coherence model focuses on electricity markets.

Countries may retain separate wholesale markets but connect them through:

cross-border capacity allocation;

market coupling;

bidding-zone arrangements;

implicit transmission allocation;

balancing platforms;

common trading rules.

The legal objective is to prevent national electricity markets from functioning as isolated systems.

Market coherence requires coordination between:

generation → transmission → cross-border capacity → wholesale trading → balancing → consumption.

This is particularly important when renewable generation is geographically concentrated. Electricity generated in one country may need to be consumed hundreds of kilometres away.

6. Interconnector-Based Coherence Model

Interconnectors provide a physical foundation for electricity-system coherence.

An interconnector allows electricity to move between national systems, but its existence creates legal questions concerning:

ownership;

transmission-system operation;

access rights;

congestion revenues;

capacity allocation;

regulatory jurisdiction;

investment;

security obligations.

Baltic Cable case

In Baltic Cable AB v Energimarknadsinspektionen, Case C-454/18 (2020), the Court of Justice of the European Union considered a cross-border high-voltage interconnector connecting the Swedish and German transmission systems. (EUR-Lex)

The Court held that an undertaking merely operating a cross-border interconnector could fall within the concept of a transmission-system operator for the relevant EU regulatory provisions. The Court emphasised that operating and maintaining such an interconnector participates in cross-border electricity trade and contributes to competition in the internal electricity market. (EUR-Lex)

Importance

The case demonstrates that legal classification cannot be separated from the physical function of electricity infrastructure.

An entity may perform a systemically important transmission function even if its infrastructure is limited to a cross-border interconnector.

7. Common Grid-Model Approach

Modern electricity regulation increasingly uses a common grid model.

Instead of every TSO analysing the network independently, interconnected operators contribute data to a common representation of the electricity system.

The model can include:

generation;

demand;

network topology;

planned outages;

transmission constraints;

interconnector flows;

reserve requirements.

This supports coordinated security analysis.

The EU System Operation framework specifically provides for methodologies concerning the construction of common grid models and coordinated operational-security analysis. (ACER)

Legal importance

Common modelling transforms technical coordination into a legal obligation of information sharing and methodological consistency.

8. Balancing and Frequency-Coherence Model

Electricity supply and demand must remain balanced almost continuously.

If generation and demand diverge substantially, system frequency can move outside acceptable limits.

Consequently, coherent electricity systems require common approaches to:

frequency restoration;

balancing energy;

reserve procurement;

automatic frequency restoration;

manual frequency restoration;

cross-border balancing;

imbalance settlement.

A particularly important recent EU case is Polskie Sieci Elektroenergetyczne S.A. and Others v ACER, Joined Cases C-281/23 P and C-282/23 P, judgment of 23 October 2025. The litigation concerned European platforms for exchanging balancing energy, including the mFRR and aFRR platforms, and the use of cross-zonal capacity for balancing. (EUR-Lex)

Significance

The case illustrates the movement from national balancing arrangements toward integrated regional and European balancing mechanisms.

9. Coherence Through Regulatory Independence

A coherent electricity system also requires regulators capable of enforcing common rules.

The EU case Commission v Germany, Case C-718/18 (2021) concerned, among other things, the independence and powers of national energy regulators under the EU internal-market framework. (InfoCuria)

Regulatory independence is important because cross-border electricity markets can be distorted if national governments exercise excessive operational control over regulators.

The broader principle is:

Technical interconnection requires institutional independence if common market and network rules are to operate consistently.

10. Unbundling as a Coherence Mechanism

Electricity-system coherence is also supported by unbundling.

Traditional electricity companies could simultaneously control:

generation;

transmission;

distribution;

supply.

Modern electricity law often separates these functions to prevent discriminatory network access and conflicts of interest.

The Commission v Germany litigation addressed EU requirements concerning effective unbundling of transmission networks from generation and supply activities, together with independence of transmission-system operators and regulators. (InfoCuria)

Unbundling therefore contributes to coherence by creating clearer institutional roles.

11. International Trade Law and Electricity Coherence

Electricity-system integration can also encounter international trade law.

For example, WTO disputes have examined measures relating to renewable-energy programmes and domestic-content requirements.

Canada — Renewable Energy

In Canada — Certain Measures Affecting the Renewable Energy Generation Sector (DS412/DS426), Japan and the EU challenged aspects of Ontario's renewable-energy programme involving domestic-content requirements. (World Trade Organization)

United States — Renewable Energy

In United States — Certain Measures Relating to the Renewable Energy Sector (DS510), India challenged renewable-energy measures involving domestic-content requirements and subsidies. (World Trade Organization)

These disputes demonstrate that electricity-system coherence extends beyond grid engineering. It also involves the relationship between:

energy policy + industrial policy + trade law + investment + market access.

12. Harmonisation Model

Another model is regulatory harmonisation.

Countries may adopt common rules relating to:

grid codes;

generator connection;

demand-response participation;

cybersecurity;

data exchange;

balancing;

emergency procedures;

renewable integration.

Harmonisation reduces transaction costs for companies operating across borders.

However, complete harmonisation may be unnecessary. A more practical approach is often minimum common standards plus national implementation.

13. Mutual-Recognition Model

Under mutual recognition, countries retain their own regulatory systems but recognise certain standards or approvals issued in another jurisdiction.

For example, participating jurisdictions may recognise:

generator certificates;

technical compliance;

balancing arrangements;

market-participant registration;

renewable-energy certifications.

This model is less centralised than EU-style harmonisation but can still facilitate cross-border electricity markets.

14. Network-Code Model

A network code establishes common technical and market requirements.

Network codes may regulate:

generator connection;

demand connection;

transmission-system operation;

emergency restoration;

capacity allocation;

congestion management;

balancing.

The advantage is that network codes convert broad principles of cooperation into specific operational obligations.

The EU's System Operation Regulation, for example, provides a minimum degree of harmonisation while allowing certain details to be implemented regionally. (ACER)

15. Crisis-Coherence Model

Electricity systems must remain coherent during emergencies.

Potential crises include:

major transmission failures;

cyberattacks;

extreme weather;

fuel shortages;

sudden generation loss;

frequency instability;

regional blackouts.

Therefore, coherence models increasingly include:

emergency plans;

defence plans;

restoration plans;

regional coordination;

information exchange;

incident reporting;

post-event investigation.

The EU system-operation framework specifically incorporates monitoring, classification and analysis of major system incidents. (ACER)

16. Adequacy-Coherence Model

System coherence also requires countries to assess whether sufficient generation and network capacity exist collectively.

A purely national adequacy assessment can become misleading when electricity markets are interconnected.

For example:

Country A may appear to have insufficient generation, but imports from Country B may satisfy demand.

Conversely:

If Country A relies excessively on Country B during peak demand, Country B may itself become constrained.

Therefore, regional adequacy assessment becomes increasingly important.

ACER's current framework includes European resource-adequacy assessment and regional coordination mechanisms. (ACER)

17. Case-Law Principles

The emerging jurisprudence can be organised around several principles:

18. Indian Relevance

For India, global electricity-system coherence is relevant because the country is moving toward a more integrated electricity market while simultaneously expanding renewable energy, storage, transmission infrastructure and regional electricity trade.

Relevant Indian legal foundations include:

Electricity Act, 2003;

Central Electricity Regulatory Commission;

State Electricity Regulatory Commissions;

National Electricity Policy;

National Electricity Plan;

Indian Electricity Grid Code;

transmission planning;

power-market regulations;

cross-border electricity-trade arrangements.

The Indian model can therefore be described as a combination of:

national regulatory coordination + unified grid operation + market integration + regional electricity trade.

This becomes particularly significant for India's electricity relationships with neighbouring South Asian countries.

19. Challenges to Global Coherence

Despite increasing integration, several barriers remain.

1. National sovereignty

States generally retain control over their electricity sectors.

2. Different regulatory philosophies

One country may emphasise competition while another prioritises state ownership or energy security.

3. Infrastructure asymmetry

Countries possess different levels of transmission capacity and technological capability.

4. Unequal market structures

Some electricity systems have competitive wholesale markets while others rely heavily on vertically integrated utilities.

5. Energy-security concerns

Governments may restrict cross-border dependence during geopolitical crises.

6. Cybersecurity

Greater interconnection creates additional potential points of systemic vulnerability.

7. Renewable intermittency

Large-scale wind and solar generation increases the need for balancing and flexibility.

20. Future Model: Layered Global Electricity Governance

The most significant emerging concept is a layered model of electricity governance.

It can be represented as:

Global level
↓
International energy and trade principles

Regional level
↓
Regional market integration + interconnection rules

National level
↓
Electricity legislation + regulators

System level
↓
TSOs + regional coordination centres

Local level
↓
Distribution networks + distributed energy resources

The objective is not necessarily to create a single world electricity regulator. Instead, the future system is more likely to involve interoperable layers of governance.

21. Conclusion

Global electricity-system coherence means creating legal and institutional compatibility among electricity systems that remain formally divided between different states.

The principal coherence models include:

supranational governance;

regional coordination;

market coupling;

interconnector governance;

common grid modelling;

balancing integration;

network-code harmonisation;

mutual recognition;

crisis coordination;

regional adequacy assessment.

The jurisprudence of the EU demonstrates that electricity law increasingly treats interconnected infrastructure as a cross-border regulatory system rather than merely a collection of national networks. Baltic Cable demonstrates the legal importance of cross-border interconnectors, while PSE v ACER illustrates the development of integrated European balancing mechanisms. (EUR-Lex)

Ultimately, the central legal principle is functional coherence: where electricity networks are physically interconnected and economically interdependent, effective regulation increasingly requires coordinated rules, shared information, common technical methodologies and institutions capable of managing cross-border effects.