Gas Storage Regulation and Emergency Supply Obligations

Gas storage regulation is a central component of energy security law because natural gas demand is highly seasonal, while supply can be interrupted by geopolitical conflict, infrastructure failure, extreme weather, or market disruption. Legal systems therefore regulate both the availability of storage capacity and the duties of suppliers and public authorities during emergencies.

The most developed legal framework is found in the European Union, particularly under Regulation (EU) 2017/1938 on the security of gas supply, as amended by Regulation (EU) 2022/1032. The framework combines storage-filling obligations, emergency planning, supplier duties, solidarity between Member States, monitoring, and intervention powers. (EUR-Lex)

1. Meaning and Purpose of Gas Storage Regulation

Gas storage regulation refers to legal rules governing:

ownership and operation of underground gas storage;

access to storage capacity;

minimum storage levels;

obligations imposed on gas suppliers;

strategic or balancing stocks;

withdrawal of stored gas during emergencies;

monitoring and reporting;

emergency intervention by governments and regulators; and

cross-border use of storage facilities.

Storage serves several legal and economic functions.

A. Seasonal balancing

Gas consumption generally rises during winter. Storage allows gas purchased during periods of lower demand to be withdrawn when demand increases.

B. Security of supply

Storage acts as a buffer when pipeline imports, LNG supplies, domestic production, or other sources are disrupted.

C. Emergency response

During a formally declared emergency, governments and system operators may need access to stored gas to protect households and other protected customers.

D. Market stability

Adequate storage reduces the risk that a sudden supply shortage will produce extreme price and physical-system instability.

2. EU Legal Framework

The principal EU legislation is Regulation (EU) 2017/1938 concerning measures to safeguard the security of gas supply.

Following the energy-security crisis associated with the Russian invasion of Ukraine, the EU adopted Regulation (EU) 2022/1032, specifically strengthening gas-storage requirements. (EUR-Lex)

The 2022 legislation introduced binding storage-filling targets and mechanisms for ensuring that sufficient gas is available before winter.

The basic principle is that Member States should ensure that underground gas storage facilities connected to their market areas reach at least 90% of capacity by 1 November each year, subject to the detailed rules and exceptions contained in the Regulation. (EUR-Lex)

3. Storage-Filling Obligations

Article 6a of the amended framework establishes annual filling targets and intermediate trajectories.

The 90% target is significant because it transforms storage from merely a commercial asset into an instrument of public energy security.

The law also recognises that imposing identical requirements on every Member State would not always be appropriate. For Member States with very large storage capacity, the obligation can be adjusted in accordance with the Regulation, including a limitation linked to average annual consumption. (EUR-Lex)

Intermediate targets

The legislation does not simply wait until 1 November. Member States are required to follow intermediate filling trajectories.

This creates a system of:

monitoring → early intervention → corrective measures → final storage target.

This is important from a regulatory perspective because waiting until winter to discover inadequate storage would make the legal obligation ineffective.

4. Obligations of Gas Suppliers

Gas suppliers can be required to maintain specified volumes of gas.

Under Article 6b, Member States may require suppliers to store minimum quantities, including quantities calculated by reference to gas supplied to protected customers. (EUR-Lex)

Protected customers generally include categories such as households and certain essential social services, subject to the precise statutory definitions.

The legal rationale is that suppliers benefiting from the gas market should contribute to maintaining sufficient reserves for customers whose supply is given special legal protection.

5. Storage Obligations and Proportionality

Storage obligations impose costs on market participants. Consequently, the law places limits on government intervention.

Measures adopted to achieve storage targets must be:

necessary;

clearly defined;

transparent;

proportionate;

non-discriminatory; and

verifiable.

They must also avoid unnecessary distortion of competition and must not undermine the security of supply of other Member States. (EUR-Lex)

This creates an important principle of regulated energy-security intervention:

Security of supply does not give governments unlimited power to interfere with the gas market.

Regulation must balance security, competition, consumer protection and the functioning of the internal energy market.

6. Strategic Storage

A government may establish mechanisms for strategic gas storage.

Strategic storage differs from ordinary commercial storage because gas can be acquired and held specifically for security-of-supply purposes.

EU law allows instruments for the purchase and management of strategic storage by public or private entities, provided that those instruments do not distort competition or undermine the internal gas market. (EUR-Lex)

Strategic storage therefore represents a movement from a purely market-based model toward a hybrid market-and-security model.

7. Countries Without Underground Storage

An important feature of EU law is that a country does not escape security obligations merely because it lacks domestic underground storage.

A Member State without underground gas storage must ensure that market participants have arrangements allowing access to storage in other Member States.

The general rule requires arrangements corresponding to at least 15% of the Member State's average annual gas consumption over the preceding five years, subject to technical limitations and alternative burden-sharing arrangements. (EUR-Lex)

This reflects the principle of regional energy security.

Gas storage is therefore treated as a cross-border security resource rather than exclusively as a national asset.

8. Emergency Supply Obligations

Storage regulation must be connected with emergency legislation.

An emergency may arise from:

major supply scarcity;

a supply disruption; or

a formally declared emergency.

The legal system therefore creates graduated responses rather than allowing immediate arbitrary government intervention. (EUR-Lex)

Emergency measures can include:

release of stored gas;

balancing-stock deployment;

demand-management measures;

priority supply to protected customers;

restrictions on certain consumption;

emergency procurement;

increased use of LNG;

cross-border assistance; and

solidarity mechanisms.

9. Balancing Stock

EU law also recognises balancing stock.

This is gas purchased and managed by transmission system operators or designated entities for the limited purposes of maintaining secure system operation and security of supply. (EUR-Lex)

The distinction between commercial storage and balancing stock is legally important.

10. Emergency Powers of Governments

Emergency powers must normally be exercised within a statutory framework.

Authorities may be empowered to:

order or facilitate withdrawal of gas;

designate entities responsible for emergency stocks;

prioritise protected customers;

impose temporary consumption restrictions;

coordinate cross-border gas flows;

require information from suppliers and storage operators; and

adopt emergency measures to maintain system integrity.

However, these powers are constrained by proportionality, non-discrimination and EU internal-market principles.

The 2022 Regulation specifically provides that national measures should not unnecessarily restrict cross-border storage, LNG facilities or transmission capacity. (EUR-Lex)

11. Cross-Border Solidarity

One of the most important developments in modern gas-security law is the principle of solidarity between Member States.

A Member State cannot necessarily treat gas stored within its territory as exclusively available for domestic consumption during a major crisis.

The EU framework seeks to ensure that storage infrastructure and cross-border transmission facilities remain available for regional security of supply. (EUR-Lex)

This creates a legal tension between:

national energy sovereignty

and

regional energy solidarity.

EU law increasingly resolves this tension in favour of coordinated security mechanisms, while preserving defined national responsibilities.

12. Monitoring and Reporting

Storage regulation is ineffective without information.

Operators are therefore subject to monitoring and reporting requirements. The 2022 framework requires underground storage operators to report filling levels to competent authorities on a regular basis during the filling season. (EUR-Lex)

This creates a regulatory information chain:

Storage operator → national authority → regulatory monitoring → EU coordination.

Accurate information allows regulators to determine whether intervention is necessary before an emergency develops.

13. Ownership and Security of Storage Infrastructure

Gas-storage ownership can itself become an energy-security issue.

The EU framework contains certification rules addressing situations where control over a storage operator by a person or entity could endanger security of energy supply or essential security interests.

If risks cannot adequately be mitigated, certification can be refused and authorities may require disposal of ownership interests, subject to the statutory safeguards. (EUR-Lex)

This is significant because storage regulation is no longer concerned merely with physical quantities of gas; it also concerns who controls critical gas infrastructure.

14. Important Case Law

Case 1: E.ON Czech Holding AG / Gas storage-related regulatory framework — CJEU jurisprudence

A particularly relevant line of EU jurisprudence concerns the compatibility of national gas-security obligations with EU internal-market law.

More directly, in Case C-226/16, Eni SpA v Premier ministre, the Court of Justice considered national legislation imposing gas-storage obligations on suppliers.

The Court held that EU security-of-supply legislation did not necessarily prevent national legislation from imposing storage obligations covering customers beyond the minimum category of protected customers, provided that the conditions imposed by EU law were respected. (EUR-Lex)

This is important because it establishes that Member States retain regulatory discretion to impose broader security obligations.

However, that discretion is not unlimited.

Case 2: ENI SpA v Premier ministre, Case C-226/16

The second aspect of the judgment is particularly important.

The Court held that EU law precluded national legislation requiring suppliers to satisfy gas-stock obligations necessarily and exclusively through infrastructure located within the Member State's own territory.

The Court emphasised the possibility of satisfying security-of-supply obligations at regional or EU level, subject to the relevant regulatory conditions. (EUR-Lex)

Legal principle

The case demonstrates the principle of:

security of supply + cross-border market integration.

A Member State cannot automatically transform an energy-security obligation into a requirement that all reserves physically exist within its own territory if EU law requires a broader regional approach.

15. Relationship Between Storage and Emergency Supply

The two concepts should not be confused.

Storage obligation

This is primarily a preventive obligation.

Its purpose is to ensure that adequate gas exists before a crisis.

Emergency supply obligation

This is primarily a reactive obligation.

It determines what suppliers, system operators and governments must do when supply is threatened or an emergency has already occurred.

Thus:

Storage regulation = preparedness

Emergency supply regulation = response

Together they create a complete security-of-supply system.

16. Regulatory Powers and Competition Law

Storage regulation can interfere significantly with ordinary competition.

For example, authorities may:

require suppliers to purchase gas;

require storage capacity to be released;

establish strategic reserves;

compensate storage operators;

regulate tariffs;

designate emergency-stock managers.

The EU framework therefore requires intervention to avoid unnecessary distortion of competition. (EUR-Lex)

This is particularly important where one company controls a strategically important storage facility.

The regulator must prevent a situation in which a security-of-supply measure becomes a mechanism for creating or strengthening market dominance.

17. Gas Storage as Critical Energy Infrastructure

Modern gas-storage law increasingly treats storage facilities as critical energy infrastructure.

The legal consequences include:

enhanced regulatory supervision;

ownership scrutiny;

cybersecurity and physical-security requirements;

emergency planning;

mandatory reporting;

minimum-stock obligations;

cross-border coordination; and

continuity-of-service requirements.

The importance of this approach became particularly clear following European gas-supply disruptions and geopolitical instability.

18. Indian Perspective

India does not have an EU-style underground natural-gas storage regime of comparable scale. Its gas-security architecture relies more heavily on:

LNG terminals;

pipeline infrastructure;

domestic production;

gas-import diversification;

strategic infrastructure planning;

regulatory powers of the Petroleum and Natural Gas Regulatory Board (PNGRB); and

government intervention during supply disruptions.

The Petroleum and Natural Gas Regulatory Board Act, 2006 provides the institutional foundation for regulation of downstream natural-gas infrastructure, including pipelines and related activities.

For Indian energy law, an important future question is whether India should develop more formal legal mechanisms for:

strategic gas reserves;

LNG inventory obligations;

emergency gas allocation;

minimum storage requirements;

priority customers;

emergency procurement;

regional gas-security arrangements; and

mandatory emergency planning by suppliers and pipeline operators.

19. Key Legal Principles

The major principles emerging from gas-storage and emergency-supply law are:

1. Security-of-supply principle

Governments may impose obligations designed to ensure continuous gas availability.

2. Preventive regulation

Storage obligations should be imposed before a crisis rather than relying exclusively on emergency intervention.

3. Proportionality

Security measures should not impose unnecessary burdens on market participants.

4. Non-discrimination

Regulation should not arbitrarily favour particular suppliers or infrastructure owners.

5. Cross-border cooperation

Gas security increasingly operates at regional rather than purely national level.

6. Protected-customer principle

Households and other legally protected consumers receive priority during serious supply disruptions.

7. Infrastructure-security principle

Control over strategically important storage infrastructure can itself be regulated.

8. Transparency

Storage levels, obligations and emergency decisions should be subject to monitoring and reporting.

9. Market compatibility

Security-of-supply measures should preserve competitive gas markets where possible.

10. Solidarity

Stored gas and network capacity may have regional significance during severe emergencies.

20. Conclusion

Gas storage regulation has evolved from a primarily commercial infrastructure issue into a major component of energy-security law. The modern legal model combines mandatory storage levels, supplier obligations, strategic reserves, emergency powers, cross-border cooperation and infrastructure-ownership controls.

The EU's Regulation 2022/1032 is particularly significant because it introduced the 90% annual storage target, intermediate filling trajectories, obligations for Member States without domestic storage, and mechanisms allowing governments to require suppliers and other market participants to contribute to storage security. (EUR-Lex)

The ENI/Premier ministre, Case C-226/16 judgment demonstrates an equally important limitation: national gas-security obligations cannot automatically be designed in a way that isolates the national market from regional or EU-level gas infrastructure. (EUR-Lex)

Accordingly, contemporary gas-storage law can be understood as a legal balance between security of supply, consumer protection, emergency governmental authority, market competition, infrastructure security and cross-border energy solidarity.