1. Introduction

Unstable Identity of Infrastructure Across Time is a concept used to explain how the legal, technical, economic, and institutional identity of infrastructure changes throughout its life cycle.

Infrastructure is not always a fixed or permanent object. An electricity transmission line, power plant, pipeline, smart grid, energy storage facility, or renewable energy installation may retain its physical structure while its ownership, legal classification, regulatory obligations, operational purpose, or public importance changes.

For example, an electricity transmission line may initially be treated as a conventional transmission asset. Later, it may become part of a smart grid, support renewable energy integration, provide inter-state transmission services, and become subject to new cybersecurity and system-planning requirements.

The physical asset may remain largely unchanged, but its legal and regulatory identity evolves over time.

This concept is particularly relevant to energy law because energy infrastructure often operates for decades, while statutes, technology, ownership structures, environmental requirements, and market arrangements can change considerably during that period.

Important qualification: “Unstable Identity of Infrastructure Across Time” is an analytical concept, not necessarily a formally recognized legal doctrine under that exact name. The case laws below establish related legal principles, which can be applied to this concept.

2. Meaning and essential characteristics

A. Physical continuity with legal change

An asset may remain physically identifiable even when its legal status changes. For instance, a generating station may operate under an earlier licence but become subject to revised environmental, grid-connectivity, or market regulations.

B. Technological transformation

Digital controls, automated substations, battery storage, and renewable energy integration may transform how an existing network functions. These changes can create new regulatory questions about system security, data, access, and responsibility.

C. Changing ownership and control

A public utility asset may be transferred, leased, privatized, or placed under a different operating arrangement. The asset continues to exist, but the identity of the responsible legal entity and the applicable contractual duties may change.

D. Changing public purpose

Infrastructure originally built to serve local electricity demand may later support interstate electricity trade, renewable energy evacuation, regional grid stability, or emergency supply.

These characteristics demonstrate why infrastructure cannot always be governed by a single, unchanging legal description.

3. Major legal dimensions of unstable infrastructure identity

3.1 Legal identity versus physical identity

A legal system may classify infrastructure according to its function, ownership, licence, location, or economic role rather than merely its physical characteristics.

Consider a gas-fired generating station built to meet a temporary increase in electricity demand. If the station later stops supplying consumers, its continued physical existence does not automatically mean that all the costs of its original construction remain recoverable through electricity tariffs.

This distinction raises three separate questions:

Does the infrastructure still physically exist?

Does it retain the same legal or regulatory function?

Are the same legal rights and financial entitlements still applicable?

These questions may have different answers.

3.2 Temporal instability

Infrastructure is constructed at a particular point in time, but it may operate under several different legal regimes during its lifetime.

For example:

At \(T_1\), a power plant receives approval for temporary operation.

At \(T_2\), the plant becomes part of the electricity supply arrangements.

At \(T_3\), alternative generating capacity becomes available.

At \(T_4\), the plant ceases supplying consumers.

At \(T_5\), a dispute arises concerning depreciation and recovery of capital costs.

The legal identity of the plant must be assessed in light of the relevant period and the governing approvals, regulations, contracts, and regulatory decisions.

3.3 Institutional instability

Infrastructure may be governed by multiple institutions, including electricity commissions, transmission operators, environmental authorities, local planning bodies, and courts.

A change in the division of regulatory responsibilities can affect which authority determines tariffs, grants approvals, supervises operations, or resolves disputes.

However, a change in institutional arrangements does not automatically extinguish existing rights. The applicable statute, transitional provisions, contractual terms, and valid regulatory orders must be examined.

3.4 Economic instability

The financial identity of infrastructure may change when its useful life, operating status, demand, or revenue-generating capacity changes.

For example, an asset initially treated as a productive generating facility may later become a retired asset or a stranded investment. Its physical existence may continue, but its treatment for depreciation, tariff recovery, compensation, and accounting purposes may change.

3.5 Functional instability

An infrastructure asset may perform several functions during its life.

An electricity network may initially serve conventional generation and later support distributed renewable energy, battery storage, electric vehicles, and digital grid management. The same network may consequently face new requirements for planning, access, safety, and reliability.

These changes do not necessarily create a new legal asset. Whether they alter its formal classification depends on the applicable legislation, licences, ownership arrangements, and regulatory instruments.

4. Detailed case laws

The following Indian Supreme Court decisions are particularly useful for understanding the legal consequences of changing infrastructure identity. They address related principles rather than recognizing a separate doctrine under the exact title used here.

Case 1: Delhi Electricity Regulatory Commission v. Tata Power Delhi Distribution Ltd. (2026)

Supreme Court of India · Civil Appeal No. 6388 of 2025 · Judgment dated 7 May 2026

Facts of the case

Tata Power Delhi Distribution Limited had proposed a 108 MW gas-based combined-cycle power plant at Rithala, Delhi, as a temporary measure to meet electricity demand around the Commonwealth Games. The proposed operating period was approximately five to six years, and the arrangement contemplated the eventual reversion of the land to the Delhi Development Authority.

The plant ceased supplying electricity to consumers after March 2018. A dispute arose over whether its entire capital cost could be recovered through depreciation over fifteen years. The Supreme Court considered the legality of the Appellate Tribunal for Electricity's direction allowing that recovery.

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Legal issue

Can a generating plant continue to be treated as an ordinary revenue-generating electricity asset for tariff-recovery purposes after it has ceased supplying electricity, particularly when its original purpose and intended operating life were limited?

Significance for infrastructure identity

This case directly illustrates the difference between an asset's physical existence and its changing legal and economic status.

The plant could continue to exist physically even after it stopped serving its original electricity-supply function. Its treatment for capital-cost recovery therefore had to be considered in the context of the original project arrangements, the applicable regulatory framework, and its actual operational history.

The case demonstrates why the following identities must be distinguished:

Physical identity: the generating station still exists.

Functional identity: the station no longer supplies consumers.

Economic identity: the plant's ability to generate revenue has changed.

Regulatory identity: the permissible recovery of capital costs remains a question for the applicable tariff rules and judicial review.

Legal principle and relevance

The decision is a particularly strong illustration of the proposition that the legal and economic consequences attached to infrastructure cannot be determined solely by its continued physical existence.

The judgment should be read for its actual ruling on capital-cost recovery; it should not be interpreted as establishing that cessation of operations automatically eliminates every entitlement to depreciation or compensation.

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Case 2: The Tata Power Company Ltd. v. Maharashtra Electricity Regulatory Commission (2022)

Supreme Court of India · Civil Appeal No. 1933 of 2022 · Judgment dated 23 November 2022

Facts and background

This dispute concerned the regulatory framework for developing an electricity transmission project, including the treatment of a high-voltage direct-current transmission link between the Kudus and Aarey substations. The litigation addressed the relationship between transmission-project development guidelines, tariff regulations, and the relevant government policy.

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Legal issue

How should the regulatory authority apply statutory tariff principles and government policy when determining the framework governing the development and economic treatment of transmission infrastructure?

Connection with unstable infrastructure identity

Transmission infrastructure is not legally defined by its physical components alone. Its regulatory treatment can depend on whether the project is developed under a competitive bidding framework, how tariff rules apply, and which statutory and policy requirements govern the project.

The case illustrates three dimensions of changing infrastructure identity:

Project identity: the project is characterized by its technical design and transmission function.

Regulatory identity: its legal treatment depends on the governing legislation and applicable regulatory framework.

Economic identity: its tariff and financial treatment depend on the relevant rules and lawful regulatory determinations.

Legal significance

The judgment is useful for examining how the legal framework surrounding an infrastructure project determines its treatment over time. It also illustrates that government policy, statutory principles, and regulatory discretion must be considered together rather than treating infrastructure as an isolated physical object.

The precise ratio must be drawn from the judgment's particular holdings, not from the broader analytical label of unstable identity.

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Case 3: Energy Watchdog v. Central Electricity Regulatory Commission (2017)

Supreme Court of India · (2017) 14 SCC 80 · Judgment dated 11 April 2017

Facts

The dispute concerned long-term power purchase agreements (PPAs) entered into by electricity generators, including Adani Power, with electricity distribution utilities. Changes in Indonesian coal-export regulations increased the cost of imported coal, creating disputes over tariff adjustment, force majeure, and change-in-law provisions.

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Legal issue

Could a change in the economic conditions affecting a power plant justify changing its contractual and regulatory treatment?

Judgment and principle

The Supreme Court examined the statutory allocation of regulatory jurisdiction, the contractual provisions governing change in law and force majeure, and the limits of tariff adjustment. It rejected the proposition that the Indonesian regulatory changes automatically qualified as a change in Indian law under the relevant PPA provisions. It also recognized the relevance of qualifying changes in Indian law and domestic coal-allocation policy to tariff adjustment.

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Application to infrastructure identity

This case shows that the economic identity of a power plant can change even though its physical infrastructure remains the same.

A generating station initially evaluated under one set of fuel prices and contractual assumptions may later face different costs and supply conditions. However, the legal consequences of those changes depend on the contract and applicable law, not simply on the fact that the project has become more expensive to operate.

The case therefore illustrates an important distinction:

Economic change: the plant's operating costs and commercial circumstances change.

Contractual change: the parties' rights change only to the extent permitted by the agreement and applicable law.

Regulatory change: the competent commission must act within its statutory jurisdiction.

The judgment is relevant to the proposition that infrastructure's economic identity may evolve without automatically changing its legal rights or contractual obligations.

Case 4: Tata Power Company Ltd. v. Reliance Energy Ltd. (2009)

Supreme Court of India · (2009) 16 SCC 659

Facts

The litigation concerned competing electricity distribution and supply arrangements in Mumbai, including the relationship between Tata Power and Reliance Energy and the scope of their respective licences. The dispute arose from questions about supplying electricity within areas associated with the parties' existing regulatory rights.

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Legal issue

How should the rights and obligations associated with electricity supply infrastructure be interpreted when the legal and commercial arrangements governing electricity distribution evolve?

Relevance

Electricity infrastructure is often shared, interconnected, or used by multiple entities. A distribution network cannot necessarily be understood solely by reference to who physically owns a particular wire or substation. The relevant legal analysis may also involve licences, statutory duties, access rights, and the permitted scope of supply.

The case illustrates how the regulatory identity of an electricity network is shaped by the legal rights and duties attached to it.

For example, if an electricity network's use expands or the relationship between competing suppliers changes, the applicable legal rights must be determined under the governing legislation and licence conditions. The physical network does not itself determine the answer.

Analytical principle: infrastructure identity may depend on the legal relationships governing its use, not merely on the physical asset or its owner.

This is a related application of the concept, rather than a holding that infrastructure has a formally unstable legal identity.

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Case 5: Uttar Haryana Bijli Vitran Nigam Ltd. v. Adani Power Ltd. (2019)

Supreme Court of India · Judgment dated 25 February 2019

Facts

The dispute involved power purchase agreements and claims for compensation following changes in fiscal exemptions applicable to goods and services associated with power generation. The relevant government notifications withdrew certain exemptions, prompting a claim for relief under the PPAs' change-in-law provisions.

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Legal issue

When the legal and fiscal environment surrounding a power project changes, can the resulting financial consequences be addressed through the contractual change-in-law mechanism?

Relevance to infrastructure identity

A power plant's financial identity is partly shaped by the legal assumptions under which it was developed and financed. Tax exemptions, duties, and other fiscal arrangements can affect project costs even where the plant's physical design and function remain unchanged.

This case demonstrates that the financial consequences attached to infrastructure may change as the law changes. Whether those consequences produce a right to compensation depends on the wording of the PPA and the relevant legal requirements.

The case is useful when analysing the relationship between infrastructure investment, changing legislation, and the continuity of contractual rights.

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5. Comparative summary of the cases

6. Relationship with the Electricity Act, 2003

The Electricity Act, 2003, provides an important statutory framework for analysing infrastructure whose function or legal treatment changes over time.

The following provisions are especially relevant.

Section 3 — National Electricity Policy and Plan

The Central Government prepares and periodically reviews the National Electricity Policy and tariff policy, while the Central Electricity Authority prepares the National Electricity Plan. This framework recognizes that electricity-system planning must respond to changing needs and available resources.

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Sections 61–62 — Tariff regulation

These provisions establish principles and powers relevant to tariff determination. They are important when an asset's operational status, cost structure, useful life, or regulatory treatment changes.

Section 63 — Competitive bidding

Where the statutory requirements are met, the appropriate commission adopts a tariff determined through a transparent competitive bidding process. The legal consequences of changes to the original project assumptions must be assessed under the governing statutory and contractual framework.

Sections 79 and 86 — Regulatory jurisdiction

These provisions define important functions of the Central Electricity Regulatory Commission and State Electricity Regulatory Commissions. Which commission has jurisdiction depends on the nature of the dispute and the applicable statutory provisions. Energy Watchdog illustrates the importance of that distinction.

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These provisions do not establish a doctrine called “unstable identity.” Rather, they provide the legal mechanisms through which infrastructure is regulated as its circumstances evolve.

7. Practical example: the changing identity of a transmission line

Consider a transmission line commissioned in 2010.

2010 — Initial commissioning

The line is developed to transmit electricity from conventional generating stations to nearby distribution networks. Its approvals, ownership, and tariff arrangements define its original regulatory identity.

2018 — Renewable energy integration

New solar and wind projects connect to the broader network. The line may now form part of the system used to transmit renewable electricity, subject to applicable technical and regulatory requirements.

2024 — Digital modernization

New monitoring and control systems alter how the line is operated. Cybersecurity, data management, and system reliability may become more important to its regulation.

Later years — Regulatory reassessment

The relevant authority may need to consider updated technical standards, tariff rules, asset valuation, or changes in ownership and operation. The outcome depends on the applicable law and the facts of the project.

The example demonstrates that an infrastructure asset can retain physical continuity while its role within the energy system changes. Nevertheless, its changing use does not automatically change its ownership, licence, or legal classification.

8. Major legal problems arising from unstable infrastructure identity

A. Regulatory uncertainty

When infrastructure evolves faster than the governing rules, questions may arise concerning which technical standards, tariff provisions, or licensing requirements apply.

Legal response: identify the governing statute, valid regulations, licence conditions, transitional provisions, and any applicable grandfathering arrangements.

B. Stranded assets and capital recovery

Infrastructure may become underutilized or cease operating before the end of its anticipated useful life.

Legal response: distinguish physical depreciation, accounting treatment, regulatory depreciation, contractual compensation, and tariff recovery. Each may be governed by different rules.

The Rithala plant dispute in DERC v. TPDDL is particularly relevant to this issue.

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C. Ownership and liability disputes

An asset may be transferred to another entity or operated under a different contractual arrangement.

Legal response: examine transfer instruments, licences, contractual allocation of liabilities, statutory obligations, and the legal status of any successor entity.

D. Technological obsolescence

A system designed for one generation of technology may later require substantial modernization.

Legal response: determine whether the work constitutes ordinary maintenance, capital improvement, replacement of an asset, or development of a legally distinct facility under the applicable rules.

E. Conflicts between long-term contracts and later regulation

A long-term power purchase agreement may continue to operate while the regulatory environment changes.

Legal response: interpret the contract according to its wording, the applicable statutory framework, and judicial decisions concerning change in law, force majeure, and tariff adjustment. Energy Watchdog is an important authority on these questions.

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9. A legal framework for analysing infrastructure identity over time

A useful method is to examine the asset under six separate headings.

This method avoids treating infrastructure as though every legal consequence must remain fixed throughout its physical life.

It also avoids the opposite mistake: assuming that any technological, commercial, or operational change automatically creates a new legal asset.

10. Critical analysis

The concept has considerable analytical value, but it has limits.

First, legal uncertainty is not necessarily the same as legal instability. An infrastructure asset may change function while remaining subject to a clearly defined and stable legal framework.

Second, physical continuity does not guarantee legal continuity. A transfer of ownership, expiry of a licence, retirement of a plant, or change in statutory jurisdiction can have significant legal consequences.

Third, a change in infrastructure's economic value does not automatically create a right to additional tariff recovery. Such a right must be supported by the applicable legislation, regulations, and contractual provisions.

Finally, the law must balance adaptation with legal certainty. Energy infrastructure requires long-term investment, but the public interest may also require updated safety standards, environmental safeguards, technological modernization, and appropriate treatment of obsolete assets.

The legal challenge is therefore not to prevent all changes in infrastructure identity. It is to determine which aspects of an asset's legal status remain continuous, which may legitimately change, and what legal procedure is required for that change.

11. Conclusion

Unstable Identity of Infrastructure Across Time describes the changing relationship between a physical infrastructure asset and the legal, regulatory, institutional, functional, and economic arrangements governing it.

The most directly relevant case among the authorities discussed is Delhi Electricity Regulatory Commission v. Tata Power Delhi Distribution Ltd. (2026), because it addresses the consequences of a generating plant ceasing to perform its original supply function. Energy Watchdog (2017) adds an important contractual and regulatory dimension, while the other cases illustrate related questions of transmission regulation, licensing, and changing legal costs.

Taken together, these decisions support a careful analytical proposition: the legal consequences attached to energy infrastructure must be assessed in the context of its function, governing instruments, contractual rights, and relevant period—not merely its continued physical existence.

For academic writing, the strongest approach is to present “unstable identity” as a conceptual framework derived from established principles of electricity regulation, contract law, and administrative law, rather than describing it as a separately settled doctrine of Indian law.