Competition Regulation of Electricity Transmission Monopolies

Introduction

Electricity transmission is fundamentally different from ordinary commercial activities because transmission networks require enormous capital investment, extensive land and infrastructure, and sophisticated grid-management systems. Constructing several parallel high-voltage networks over the same territory is usually economically inefficient. For this reason, electricity transmission is generally treated as a natural monopoly. Competition is therefore not normally introduced by requiring several companies to build duplicate transmission grids. Instead, competition law and energy regulation seek to prevent the transmission monopoly from being used to exclude competitors in generation, wholesale supply, renewable energy or retail electricity markets.

The central regulatory principle is therefore “monopoly in the network, competition around the network.” A transmission system operator (TSO) may operate a single physical network, but it must generally provide access on transparent, objective and non-discriminatory terms.

The European Commission has repeatedly recognised that each electricity transmission network may constitute a separate relevant geographic and product market because transmission through one network is generally not substitutable with transmission through another.

1. Why Electricity Transmission Becomes a Monopoly

Transmission networks display the characteristics of a natural monopoly. The construction of high-voltage lines, substations, transformers and control infrastructure involves very high fixed costs. Once the infrastructure exists, the marginal cost of allowing another user to transmit electricity is comparatively low.

If two companies constructed competing transmission networks between the same locations, consumers would ultimately bear substantial duplication costs. Consequently, most legal systems accept a single transmission operator but regulate its conduct.

The monopoly itself is therefore not automatically unlawful. The legal problem arises when monopoly power is used to impose discriminatory access conditions, excessive charges, exclusionary practices, refusal to connect competitors or preferential treatment for affiliated generation and supply businesses.

2. Competition Law and the Essential-Facilities Principle

Transmission networks can resemble an essential facility because electricity generators and suppliers may be unable to reach consumers without access to the network. Competition law therefore becomes particularly important where a network operator controls infrastructure that competitors cannot economically duplicate.

A dominant transmission operator may violate competition principles where it:

refuses access without objective justification;

discriminates between competing generators;

gives preferential network access to an affiliated company;

imposes unreasonable or discriminatory transmission charges;

deliberately delays grid connection;

restricts available transmission capacity;

uses technical standards to exclude competitors; or

exchanges commercially sensitive information with affiliated generation or supply businesses.

The regulatory objective is not necessarily to eliminate the monopoly but to prevent the monopoly from becoming a mechanism for suppressing competition in related markets.

3. Structural Separation and Unbundling

One of the most important tools for regulating transmission monopolies is unbundling. A company controlling transmission infrastructure should not be able to use that position to favour its own generation or electricity-supply activities.

European electricity legislation developed several models of separation, including ownership unbundling, independent system operators and independent transmission operators. These mechanisms seek to ensure that network decisions are based on technical and economic considerations rather than the commercial interests of an affiliated electricity producer or supplier.

Unbundling is particularly important because a vertically integrated electricity company may otherwise have an incentive to provide better access to its own generation business while disadvantaging independent generators.

4. Non-Discriminatory Third-Party Access

A core principle is third-party access (TPA). Independent generators, suppliers and other eligible market participants should be able to use the transmission system according to published and objectively determined rules.

Access rules must generally address:

connection procedures;

available transmission capacity;

congestion management;

transmission tariffs;

balancing requirements;

technical standards;

curtailment procedures; and

dispute-resolution mechanisms.

The purpose is to prevent the network operator from becoming a “gatekeeper” capable of determining which competitors may participate in the electricity market.

5. Transmission Tariffs and Competition

Transmission tariffs are another major competition concern. A monopoly operator cannot normally be allowed to set prices entirely according to its own commercial interests.

Regulatory authorities may therefore establish or approve tariff methodologies based upon principles such as cost reflectivity, transparency, efficiency and non-discrimination. Excessively high charges can prevent new generators from entering the market, while discriminatory charges can favour affiliated companies.

The competition authority and energy regulator therefore have complementary roles: competition law addresses abusive conduct, while sector regulation establishes the rules under which the monopoly must operate.

6. Congestion and Capacity Allocation

Transmission capacity is limited. When electricity demand for a particular transmission corridor exceeds available capacity, congestion occurs. This creates another opportunity for discriminatory behaviour.

Modern electricity regulation therefore requires transparent capacity-allocation and congestion-management mechanisms. Capacity should generally be allocated according to predetermined rules rather than through discretionary decisions favouring particular market participants.

Cross-border interconnection is especially important because transmission capacity can determine whether electricity producers from another jurisdiction can enter a national market.

7. Important Case Laws

(1) Commission v Netherlands, C-157/94 (1997)

The European Court of Justice examined national electricity import arrangements and the relationship between electricity monopolies and European free-market principles. The litigation concerned restrictions associated with national electricity systems. The case demonstrates that public or regulated electricity monopolies cannot automatically be insulated from European market principles merely because electricity is considered a strategic service.

(2) Commission v Italy, C-158/94 (1997)

Italy had historically entrusted major electricity activities, including transmission, to ENEL. The Court examined the compatibility of national electricity arrangements with European law. The case illustrates the tension between state-created electricity monopolies and the objective of an integrated European electricity market.

(3) Commission v France, C-159/94 (1997)

France's electricity system historically gave EDF extensive control over generation, transmission, import and export activities. The case is significant because it demonstrates that national electricity monopolies may be scrutinised where they interfere with cross-border trade and market integration.

(4) Commission v Spain, C-160/94 (1997)

Spain's high-voltage electricity system was managed through a state-controlled structure. The litigation formed part of the European Court's examination of national electricity monopolies and their compatibility with European market principles. It illustrates the gradual transition from nationally protected electricity systems toward integrated electricity markets.

(5) Balgarska energiyna borsa v Komisia za energiyno i vodno regulirane, C-347/16 (2017)

This case is particularly important for understanding monopoly regulation. The Court confirmed that the mere existence of a dominant position does not itself constitute an abuse, and the creation of a dominant position through special or exclusive rights is not automatically incompatible with EU competition law. What matters is how that position is exercised.

(6) Bursa Română de Mărfuri SA v ANRE, C-394/21 (2023)

The Court considered a national legal monopoly relating to electricity-market intermediation. It held that EU electricity-market legislation did not automatically prohibit a pre-existing national legal monopoly under the conditions specified by the applicable legislation. Importantly, the judgment reaffirmed the distinction between the existence of a monopoly and abusive conduct arising from monopoly power.

(7) National Grid Electricity Transmission Plc v ABB Ltd & Others [2012] EWHC 869 (Ch)

This English case arose from the European Commission's investigation into the gas-insulated switchgear cartel. The equipment was important for electricity-grid substations. The case demonstrates that competition law also protects the competitive procurement environment surrounding electricity transmission infrastructure, not merely access to the transmission network itself.

8. Regulatory Authorities and Remedies

Competition authorities and electricity regulators may employ several remedies against abusive transmission monopolies. These include fines, compulsory access, tariff intervention, structural separation, behavioural commitments, information-sharing restrictions and orders requiring non-discriminatory treatment.

Regulators may also require the transmission operator to publish network-access rules and capacity information so that competitors can determine whether discriminatory treatment has occurred.

9. Indian Perspective

In India, electricity transmission has traditionally been dominated by regulated network operators, while competition has increasingly developed in generation and electricity supply. The Electricity Act, 2003 provides the broader legal framework for transmission licensing, open access and regulatory supervision, while the Competition Act, 2002 addresses anti-competitive agreements, abuse of dominant position and combinations.

The Indian approach therefore reflects the same fundamental principle: transmission infrastructure may remain regulated as a natural monopoly, but its control cannot legitimately be used to prevent competition in electricity generation, supply or emerging renewable-energy markets.

Conclusion

Competition regulation of electricity transmission monopolies does not usually seek to create competing physical transmission networks. Instead, it seeks to ensure that the unavoidable network monopoly remains neutral, transparent, accessible and properly regulated. The most important safeguards are third-party access, non-discriminatory tariffs, unbundling, transparent capacity allocation, independent regulation and competition-law enforcement.

The case law establishes an important distinction: a monopoly is not necessarily illegal; abusive exploitation of monopoly power can be. Modern electricity law therefore accepts the economic necessity of transmission monopolies while placing legal constraints on their ability to discriminate against competitors. This model allows the physical efficiency of a single transmission network to coexist with competitive electricity generation, wholesale trading, renewable-energy development and consumer choice.