1. Introduction

Local Flexibility Markets (LFMs) are emerging electricity-market arrangements through which distributed energy resources (DERs)—such as rooftop solar, batteries, electric vehicles, demand-response assets, heat pumps, and flexible industrial or commercial loads—can be coordinated to solve local network constraints.

Traditional electricity markets generally operate at national, regional, or wholesale levels. However, distribution networks can experience highly localized problems: a particular feeder may become overloaded, voltage may rise because of excess solar generation, or demand may become concentrated in a particular area. Building new network infrastructure is one possible response, but network operators can sometimes address these constraints more efficiently by purchasing flexibility from DER owners.

A local flexibility market therefore creates a mechanism through which a Distribution System Operator (DSO) or Distribution Network Operator (DNO) identifies a local constraint, defines the required flexibility product, invites bids from eligible DER providers, and procures the required reduction, increase, or shifting of electricity demand or generation.

The legal importance of LFMs lies in determining:

1. who may operate the market;
2. who may participate;
3. how flexibility is procured;
4. how network operators remain neutral;
5. how DER owners are compensated;
6. how flexibility interacts with wholesale and balancing markets;
7. how consumer protection is maintained; and
8. how conflicts between DSO procurement and system-wide electricity markets are resolved.

2. Meaning of Local Flexibility

Flexibility is the ability of an electricity resource to alter its electricity consumption or generation in response to a system requirement.

For example:

• a battery can discharge when a local feeder is congested;
• an EV charging station can postpone charging;
• an industrial facility can temporarily reduce consumption;
• a heat pump can shift its electricity demand;
• a battery can absorb excess solar generation;
• a distributed generator can increase or decrease output.

The important point is that flexibility is location-sensitive.

A 10 MW battery situated on a congested feeder may be extremely valuable to a DSO, while an identical 10 MW battery connected elsewhere may provide little or no assistance to that particular constraint.

Thus, local flexibility differs from ordinary wholesale flexibility because electrical location becomes part of the value of the service.

3. DER Coordination Through Local Flexibility Markets

DER coordination involves bringing together numerous small resources that would otherwise operate independently.

A simplified structure is:

DER owners → Flexibility platform/aggregator → DSO → Distribution network

The process normally involves:

Step 1: Network assessment

The DSO identifies a constraint using network planning, forecasting, power-flow analysis, or real-time monitoring.

Step 2: Definition of flexibility need

The DSO specifies:

• location;
• quantity;
• duration;
• response time;
• availability period;
• direction of flexibility; and
• technical requirements.

Step 3: Market participation

Aggregators and DER owners submit bids.

Step 4: Market clearing

The DSO selects economically and technically suitable offers.

Step 5: Activation

When the network constraint occurs, the selected resources are instructed to provide flexibility.

Step 6: Measurement and settlement

Actual performance is measured and providers are paid according to the applicable contractual or market rules.

4. Why Local Flexibility Markets Are Necessary

The growth of DERs changes distribution-system operation.

Traditional distribution networks were generally designed around:

large generators → transmission network → distribution network → consumers

Modern networks increasingly look like:

large generators ↔ transmission ↔ distribution ↔ consumers + solar + batteries + EVs + flexible loads

This creates two major problems.

A. Reverse power flows

Large amounts of rooftop solar can cause electricity to flow from distribution networks back toward higher-voltage networks.

B. Local congestion

Simultaneous EV charging, heat-pump operation, or industrial demand may overload particular feeders or transformers.

Instead of reinforcing every network component, flexibility can sometimes provide an alternative.

5. Types of Local Flexibility

A. Demand reduction

Consumers temporarily reduce electricity consumption.

Example:

An industrial consumer reduces its load by 2 MW for one hour.

B. Demand increase

A flexible consumer deliberately increases consumption.

This can be useful when there is excess local generation.

For example, an EV charging hub could increase charging during periods of excess solar production.

C. Generation reduction

A distributed generator reduces output.

For example, a solar installation may curtail generation when local voltage or network capacity becomes problematic.

D. Generation increase

A battery or flexible generator increases output during a local constraint.

E. Energy shifting

Batteries and EVs can shift electricity consumption or generation from one period to another.

6. Role of Aggregators

Individual DERs may be too small to participate directly.

An aggregator combines multiple resources into a portfolio.

For example:

• 1,000 household batteries;
• 500 EV chargers;
• 200 heat pumps; and
• several commercial consumers

may collectively provide 20 MW of flexibility.

The aggregator therefore acts as an intermediary between DER owners and the flexibility market.

The legal framework must address:

• aggregator licensing;
• contractual relationships;
• data access;
• metering;
• consumer consent;
• performance obligations;
• liability;
• payment;
• cybersecurity; and
• market access.

7. DSO/DNO as Procurer of Flexibility

A central legal issue is whether the network operator should be allowed to operate a local flexibility market.

A DSO has a fundamentally different role from a conventional electricity trader.

Its primary responsibility is network operation rather than speculative energy trading.

Therefore, regulation generally needs to ensure that:

flexibility procurement is undertaken to solve objectively identified network requirements rather than to distort competitive electricity markets.

The DSO should ideally define its requirement transparently and procure flexibility through neutral and non-discriminatory procedures.

8. Relationship Between Local and Wholesale Markets

Local flexibility markets cannot operate in isolation.

The same battery might simultaneously be capable of providing:

• wholesale energy;
• frequency response;
• balancing services; and
• local network flexibility.

This creates a potential stacking problem.

Suppose a battery has a 10 MW capacity.

A wholesale market participant may schedule the battery to discharge 8 MW while the DSO simultaneously expects it to provide 5 MW of local support.

The resource cannot necessarily satisfy both requirements.

Therefore, market rules need coordination mechanisms.

Possible approaches include:

Sequential coordination

The wholesale market clears first and the local flexibility market subsequently considers the remaining flexibility.

Integrated coordination

The system calculates the interaction between different markets simultaneously.

Capacity reservation

Part of the DER's capacity is reserved for local flexibility.

Explicit distribution-network constraints

Wholesale-market scheduling incorporates distribution-level constraints where technically feasible.

9. Legal Principles Governing Local Flexibility Markets

Several legal principles are particularly important.

9.1 Non-discrimination

DER providers should have fair access to procurement opportunities.

9.2 Transparency

The DSO should disclose:

• flexibility requirements;
• procurement rules;
• technical requirements;
• selection methodology;
• settlement principles.

9.3 Competition

Flexibility procurement should avoid unnecessarily favouring incumbent network assets.

9.4 Technology neutrality

Rules should generally focus on the service required rather than prescribing a particular technology.

9.5 Consumer protection

Residential consumers participating through aggregators need clear information concerning:

• payments;
• control rights;
• data;
• override rights;
• contract termination; and
• consequences of non-performance.

9.6 Data protection

Smart meters and DER platforms generate detailed information concerning electricity consumption and operational behaviour.

Access to such data therefore requires appropriate privacy and cybersecurity safeguards.

10. Important European Union Legal Framework

The European Union has been particularly influential in developing the legal architecture for active consumers, aggregators and flexibility.

The Clean Energy for All Europeans framework strengthened the legal position of consumers and distributed resources within electricity markets.

The Electricity Directive (EU) 2019/944 is particularly important because it recognises active customers and independent aggregation and establishes principles relevant to demand response and distributed flexibility.

The accompanying Electricity Regulation (EU) 2019/943 provides the broader framework for electricity-market operation and balancing.

These instruments support the broader transition from a centrally controlled electricity system toward a system in which distributed resources can actively participate.

11. UK Regulatory Framework

The UK has developed extensive regulatory and practical experimentation around flexibility services.

Ofgem and distribution network operators have progressively moved toward competitive flexibility procurement.

The transition from DNO to DSO models reflects the growing need for distribution networks to coordinate:

• distributed generation;
• storage;
• demand response;
• EVs; and
• flexible loads.

The UK's Distribution Code, connection arrangements, network charging framework and regulatory price-control mechanisms interact with flexibility procurement.

A particularly important regulatory concept is the use of flexibility as an alternative to conventional network reinforcement where technically and economically appropriate.

12. Case Law and Legal Authorities

Local flexibility markets are relatively new, meaning that there are relatively few court judgments specifically titled "local flexibility market" cases. Consequently, the legal framework is best understood through related electricity-market, network-regulation, competition, and distributed-generation cases.

Case 1: Federutility and Others v Autorità per l'energia elettrica e il gas

CJEU, Case C-265/08

This case concerned regulation of energy prices and the conditions under which Member States may intervene in energy markets.

Its broader significance for local flexibility markets lies in the relationship between:

• regulatory intervention;
• market competition; and
• public-interest objectives.

The case demonstrates that energy-market regulation must operate within the broader legal framework governing competitive markets.

Relevance

For LFMs, regulators need to distinguish between legitimate network intervention and unnecessary interference with competitive market mechanisms.

13. Case 2: Essent Belgium NV v Vlaamse Reguleringsinstantie voor de Elektriciteits- en Gasmarkt

CJEU, Joined Cases C-204/12 to C-208/12

The litigation concerned aspects of renewable-energy support and electricity-market regulation.

The broader legal significance is that electricity regulation must respect principles arising from EU law while pursuing legitimate energy-policy objectives.

Relevance to LFMs

Local flexibility procurement similarly requires balancing:

• network reliability;
• decarbonisation;
• competition;
• market access; and
• consumer interests.

14. Case 3: PreussenElektra AG v Schleswag AG

CJEU, Case C-379/98

This landmark electricity-market case concerned Germany's renewable-electricity purchasing regime.

The judgment is important in the development of European electricity-law principles concerning renewable generation and electricity-market regulation.

Relevance

Modern flexibility markets similarly require legal mechanisms that integrate decentralised resources into electricity markets without undermining legitimate public-policy objectives.

15. Case 4: Commission v Germany

CJEU, Case C-405/16 P

This case involved the European Commission's assessment of German electricity arrangements and State-aid principles.

Its importance for energy-market governance lies in the interaction between electricity-market arrangements and EU competition/state-aid rules.

Relevance to local flexibility

Where public authorities or regulated DSOs establish financial mechanisms for flexibility procurement, questions can arise concerning:

• preferential treatment;
• competitive neutrality;
• public financing; and
• market distortion.

Therefore, LFM design must be compatible with applicable competition and State-aid rules.

16. Case 5: R (National Grid Electricity Transmission plc) v Gas and Electricity Markets Authority

UK regulatory litigation concerning GEMA/Ofgem provides an important body of authority concerning the regulation of network operators.

Although not necessarily an LFM case in the modern sense, such decisions illustrate the judicial approach to:

• regulatory discretion;
• network regulation;
• statutory powers;
• tariff arrangements; and
• economic regulation.

Relevance

As DSOs begin procuring flexibility, courts may similarly be required to examine whether regulators have acted within their statutory powers and applied appropriate regulatory methodologies.

17. Case 6: R (on the application of British Gas Trading Ltd) v Gas and Electricity Markets Authority

UK electricity and gas regulatory litigation involving Ofgem illustrates the importance of statutory interpretation and regulatory reasonableness in energy-market design.

Relevance

Local flexibility procurement rules may be challenged where participants argue that:

• procurement rules are discriminatory;
• regulatory decisions are inadequately reasoned;
• tariff treatment is unlawful; or
• regulatory methodology exceeds statutory authority.

18. Regulatory Experimentation and Sandbox Approaches

Because LFMs are relatively new, regulators increasingly use:

• regulatory sandboxes;
• pilot flexibility markets;
• innovation projects;
• demonstrator programmes; and
• temporary regulatory exemptions.

This allows regulators to test:

• market design;
• bidding mechanisms;
• baseline methodologies;
• settlement arrangements;
• consumer participation; and
• DSO procurement.

Such experimentation is particularly important because traditional electricity regulation was designed for a comparatively centralized electricity system.

19. Local Flexibility and Network Reinforcement

A major policy question is:

Should a DSO build new network infrastructure or purchase flexibility?

Suppose a distribution transformer is overloaded for 100 hours per year.

Traditional regulation might require reinforcement.

A flexibility market could instead procure:

• battery discharge;
• EV charging reduction;
• industrial demand response; or
• distributed-generation management.

If flexibility can reliably resolve the constraint, the DSO may defer reinforcement.

This is often described as flexibility as an alternative to reinforcement.

However, flexibility cannot always substitute for infrastructure.

Long-term structural capacity requirements may still require:

• new substations;
• transformers;
• conductors;
• cables; or
• network expansion.

20. Competition Concerns

The DSO occupies a unique position because it controls essential infrastructure.

It therefore has access to information concerning:

• network constraints;
• connection capacity;
• system forecasts;
• technical requirements.

This creates a potential information asymmetry.

If a DSO also participates in competitive flexibility activities, there is a risk that its regulated position could provide an unfair advantage.

Accordingly, regulation may require:

• functional separation;
• transparent procurement;
• independent oversight;
• publication of flexibility requirements;
• standardized contracts; and
• monitoring of procurement outcomes.

21. Consumer Participation

Residential consumers can participate indirectly through:

• aggregators;
• energy suppliers;
• community-energy organisations; or
• flexibility platforms.

For example, a household with a battery could permit an aggregator to discharge the battery during a local network constraint.

The consumer might receive:

• direct payment;
• reduced electricity costs;
• energy credits; or
• another contractual benefit.

Consumer law must ensure that participation is genuinely informed and voluntary.

22. Baseline Measurement Problem

One of the most difficult technical-legal issues is determining:

How much flexibility did the participant actually provide?

Suppose a consumer normally consumes 5 MW but reduces consumption to 3 MW during a flexibility event.

The DSO needs to determine whether the consumer actually delivered 2 MW of flexibility.

This requires a baseline.

Different methodologies may produce different payments.

Therefore, baseline rules have legal importance because they affect:

• payment;
• penalties;
• market integrity;
• disputes; and
• participant confidence.

23. Double Procurement and Double Compensation

Another important problem is double participation.

A battery could potentially be contracted for:

1. wholesale energy;
2. balancing services;
3. capacity services; and
4. local flexibility.

If market operators do not coordinate, the same physical capability may be sold multiple times.

This can create:

• physical infeasibility;
• settlement disputes;
• reliability risks; and
• unfair market outcomes.

Consequently, flexibility-market rules need clear provisions on market stacking and exclusivity.

24. Role of Smart Meters and Digital Platforms

LFMs depend heavily on digital infrastructure.

A functioning system generally requires:

• smart meters;
• real-time or near-real-time data;
• automated controls;
• secure communication;
• forecasting;
• market platforms;
• measurement and verification.

This creates additional legal questions concerning:

• data ownership;
• cybersecurity;
• privacy;
• interoperability;
• access rights; and
• liability for incorrect data.

25. Indian Legal Context

India does not yet have a mature nationwide LFM architecture equivalent to the most developed European experimentation.

However, the conceptual foundation exists within India's evolving electricity-market framework.

Relevant legislation and regulatory instruments include:

• Electricity Act, 2003;
• Energy Conservation Act, 2001, as amended;
• regulations of the Central Electricity Regulatory Commission (CERC);
• regulations and orders of State Electricity Regulatory Commissions;
• rules relating to renewable-energy integration;
• smart-metering frameworks; and
• emerging distributed-energy and demand-response initiatives.

The Electricity Act's broader framework concerning open access, distribution, system operation and regulatory oversight provides an institutional foundation upon which more sophisticated flexibility mechanisms can develop.

26. Indian Judicial Principles Relevant to LFMs

PTC India Ltd. v Central Electricity Regulatory Commission

(2010) 4 SCC 603

This is a major Indian electricity-regulation case concerning the statutory powers of CERC and the regulatory framework governing electricity markets.

The Supreme Court examined the relationship between statutory regulations and tariff-related regulatory authority.

Importance for LFMs

Future Indian flexibility markets will similarly depend on clearly defined statutory and regulatory authority.

Questions may arise regarding whether a regulator has adequate legal power to:

• establish flexibility mechanisms;
• approve procurement rules;
• regulate aggregators;
• determine compensation; and
• supervise distribution-level market arrangements.

27. Energy Watchdog v CERC

(2017) 14 SCC 80

The Supreme Court considered contractual and regulatory issues within India's electricity sector.

The case demonstrates the importance of examining electricity arrangements within their statutory and contractual framework.

Relevance to LFMs

Flexibility contracts may contain provisions concerning:

• availability;
• activation;
• force majeure;
• compensation;
• performance;
• penalties; and
• termination.

Therefore, contractual certainty will be essential to India's future flexibility markets.

28. Adani Power (Mundra) Ltd. v Gujarat Electricity Regulatory Commission

(2019) 19 SCC 9

The Supreme Court addressed regulatory and contractual issues concerning electricity supply and tariff arrangements.

Relevance

Although not a local flexibility case, the decision demonstrates how Indian electricity disputes can involve the interaction between:

• contracts;
• tariffs;
• regulatory authority; and
• statutory electricity regulation.

These principles could become relevant when flexibility procurement contracts develop at distribution level.

29. Legal Architecture for a Local Flexibility Market

A mature LFM could be structured through five legal layers.

Layer 1 — Primary legislation

Defines:

• DSO powers;
• aggregator rights;
• consumer participation;
• regulatory authority.

Layer 2 — Regulatory rules

Establish:

• eligibility;
• procurement procedures;
• market access;
• settlement;
• penalties.

Layer 3 — Network codes

Specify:

• technical requirements;
• connection standards;
• response times;
• reliability requirements.

Layer 4 — Market rules

Specify:

• bidding;
• clearing;
• activation;
• pricing;
• settlement.

Layer 5 — Individual contracts

Define obligations between:

• DSO;
• aggregator;
• DER owner; and
• other market participants.

30. Key Legal Challenges

1. Jurisdictional uncertainty

Which regulator controls local flexibility?

2. DSO neutrality

How can the DSO procure flexibility without distorting competition?

3. Aggregator regulation

What licensing and obligations should aggregators have?

4. Consumer protection

How can residential DER owners participate safely?

5. Data governance

Who can access DER operational data?

6. Market stacking

Can one DER participate simultaneously in several markets?

7. Settlement

How should performance be measured?

8. Liability

Who bears responsibility when flexibility fails?

9. Cybersecurity

How should remotely controlled DERs be protected?

10. Cost allocation

Who pays for local flexibility—the DSO, consumers, suppliers, or the wider system?

31. Future Development

Local flexibility markets are likely to become increasingly important as electricity systems experience:

• electrification of transport;
• electrification of heating;
• rooftop solar growth;
• battery deployment;
• distributed wind;
• smart meters;
• demand response; and
• increasingly digital distribution networks.

The legal transition is therefore from a model in which consumers are primarily passive users of electricity networks toward one in which consumers and DER owners can become active providers of network services.

32. Conclusion

Local Flexibility Markets for DER Coordination provide a legal and economic mechanism for integrating distributed resources into distribution-system operation.

Their central principle is straightforward:

Instead of relying exclusively on physical network reinforcement, distribution operators can procure flexibility from distributed resources to manage local network constraints.

The legal framework must nevertheless preserve competitive neutrality, consumer protection, transparency, technical reliability, data security and coordination with wholesale and balancing markets.

The developing European framework—particularly the EU electricity-market reforms—provides important legal foundations for active customers, aggregators and demand-side flexibility. UK regulatory experimentation provides practical examples of DSO flexibility procurement. In India, the Electricity Act 2003, CERC/SERC regulatory powers and Supreme Court jurisprudence such as PTC India Ltd. v CERC and Energy Watchdog v CERC provide relevant legal principles, although a comprehensive Indian local-flexibility-market regime remains an area for further regulatory development.

Thus, LFMs represent not merely a new trading mechanism but a broader transformation in electricity law: the distribution network is increasingly becoming an active market platform where consumers, storage, renewable generators and aggregators can provide services traditionally associated with centralized power-system assets.