1. Introduction

Past-dependent governance refers to a situation in which present electricity-sector decisions are substantially shaped by earlier laws, contracts, investments, regulatory decisions, institutional arrangements, infrastructure choices, and technological pathways.

Electricity systems are particularly prone to this phenomenon because generation plants, transmission networks, distribution assets and power-purchase agreements often operate for decades. Consequently, a regulator cannot design today's electricity market as though the system were starting from zero. Existing contractual obligations, sunk investments, tariff structures, grid configurations and previously granted approvals constrain the available choices.

Thus, past-dependent governance creates a relationship between:

Past decisions → Existing institutional and physical structures → Present legal constraints → Future regulatory choices.

In energy law, this is closely associated with path dependence, regulatory continuity, stranded assets, legacy contracts, vested expectations, and transition costs.

2. Meaning of Past-Dependent Governance

Past-dependent governance means that the legal and institutional capacity to govern an electricity system today is partly determined by decisions made earlier.

For example, suppose a government historically encouraged coal-fired generation through:

long-term PPAs;

assured fuel arrangements;

transmission investments;

regulated tariffs;

generation incentives; and

public-sector financing.

Years later, the government may introduce renewable-energy policies. However, it cannot simply eliminate the existing coal-based system without addressing the legal and economic consequences of those earlier decisions.

The existing system therefore becomes a form of institutional memory embedded in infrastructure and contracts.

3. Main Sources of Path Dependence

A. Long-Term Power Purchase Agreements

PPAs may last 15–25 years or longer. Once approved, they establish:

tariff mechanisms;

payment obligations;

change-in-law provisions;

fuel-price mechanisms;

termination rights;

default provisions.

Future regulators therefore operate within a contractual framework created by previous regulatory decisions.

The Supreme Court's decisions concerning Energy Watchdog v. CERC illustrate this principle. The Court examined how contractual change-in-law provisions interact with subsequent governmental or regulatory changes. (Sci API)

B. Sunk Infrastructure

Electricity infrastructure has a long economic life.

Examples include:

coal plants;

hydroelectric dams;

nuclear facilities;

transmission corridors;

substations;

distribution networks;

gas pipelines.

Once constructed, these assets cannot easily be replaced without significant economic loss.

Consequently, infrastructure creates material constraints on regulatory choice.

A regulator introducing a new market structure must consider the existing asset base, depreciation, financing obligations and consumer tariffs.

C. Legacy Tariff Structures

Historical tariff methodologies can continue influencing present regulation.

For example, a system may move from:

cost-plus regulation → competitive bidding → market-based procurement.

But existing generating stations may remain under older tariff arrangements.

This creates a coexistence of different regulatory regimes within the same electricity system.

The Supreme Court has recognised that tariff determination is closely connected with the broader regulatory function under the Electricity Act, 2003. In PTC India Ltd. v. CERC, the Court characterised tariff determination as legislative in character while remaining subject to statutory appellate mechanisms. (Indian Kanoon)

4. Institutional Path Dependence

Past dependence is not limited to physical assets.

It also develops through institutions.

For example:

Government policy → Electricity Board → Corporatisation → Regulatory Commission → Competitive market

Each institutional stage leaves behind:

regulations;

licences;

employees and expertise;

administrative practices;

precedents;

contractual relationships;

databases;

technical standards.

Therefore, institutional reform rarely produces a completely new system. Instead, the new institution frequently inherits the responsibilities and problems of its predecessor.

5. Legal Path Dependence

Electricity law contains numerous examples of legal decisions continuing to influence future governance.

PTC India Ltd. v. CERC

The Constitution Bench in PTC India Ltd. v. Central Electricity Regulatory Commission, (2010) 4 SCC 603 is fundamental to understanding electricity regulatory governance.

The Court examined the relationship between:

the Electricity Act;

regulations made by CERC;

tariff determination;

appellate jurisdiction; and

regulatory authority.

The case established an important institutional principle: electricity regulation must operate within the statutory architecture established by Parliament, while regulatory commissions exercise the powers assigned to them under that framework. Later electricity cases continue to rely upon this institutional structure. (Indian Kanoon)

This demonstrates path dependence because later regulatory decisions operate within a legal architecture already established by the Electricity Act and earlier judicial interpretation.

6. Energy Watchdog v. CERC

Energy Watchdog v. Central Electricity Regulatory Commission, (2017) 14 SCC 80 is particularly important.

The dispute concerned imported coal prices and the consequences for PPAs. The Supreme Court examined whether changes in Indonesian coal regulations constituted a contractual "change in law" and whether the contractual framework permitted relief.

The case demonstrates that a power project cannot simply disregard the historical contractual framework because economic conditions subsequently change.

The Court also emphasised the need to read the Electricity Act as an integrated statutory framework and recognised the relationship between Sections 62, 63 and 79 concerning tariff regulation. Later Supreme Court decisions have relied upon these principles. (Sci API)

Significance for past-dependent governance

The case illustrates three forms of dependence:

Contractual dependence — existing PPA provisions constrain future responses.

Regulatory dependence — government bidding guidelines influence regulatory decisions.

Investment dependence — power projects were constructed on the basis of assumptions existing when the investment was made.

7. Change-in-Law Mechanisms

Change-in-law clauses are particularly important because they create a legal mechanism for reconciling past contracts with future regulatory change.

For example:

PPA signed in 2010 → environmental rule changes in 2015 → additional compliance costs → tariff adjustment claim.

The original PPA therefore becomes a legal bridge between two regulatory periods.

In Uttar Haryana Bijli Vitran Nigam Ltd. v. Adani Power, the Supreme Court considered restitution and carrying costs associated with change-in-law consequences under the PPA. (Sci API)

Similarly, later decisions have considered changes involving:

coal regulations;

environmental requirements;

railway charges;

government policies;

fuel-supply arrangements.

The Court's treatment of these issues demonstrates that regulatory transition frequently has to occur through existing contractual structures rather than outside them. (Sci API)

8. Stranded Assets and Energy Transition

Past-dependent governance becomes particularly significant during the transition from fossil fuels to renewable energy.

Consider a coal plant constructed with an expected operating life of 30–40 years.

Later, government policy introduces:

renewable-energy targets;

carbon constraints;

emissions standards;

competitive renewable auctions;

storage requirements.

The plant may become economically less competitive.

Yet the plant may still have:

outstanding debt;

contractual commitments;

employees;

transmission connections;

fuel arrangements;

depreciation obligations.

This produces the problem of stranded assets.

The legal challenge is therefore not simply:

"Should coal be replaced?"

Instead, it becomes:

"How should the legal and economic consequences of previous infrastructure decisions be managed during transition?"

9. Regulatory Expectations

Past-dependent governance also operates through legitimate expectations and regulatory stability.

Investors often make decisions based upon:

government policies;

tariff regulations;

licences;

bidding documents;

PPAs;

statutory guarantees;

regulatory orders.

Sudden regulatory changes can therefore create disputes concerning:

contractual rights;

legitimate expectations;

regulatory certainty;

investment protection;

tariff recovery.

However, past decisions do not necessarily freeze regulation permanently. Electricity regulators remain capable of changing regulatory frameworks when authorised by law.

The key legal question is therefore whether the new regulatory intervention is within statutory authority and compatible with existing contractual and legal rights.

10. Path Dependence and Grid Infrastructure

Transmission and distribution systems provide another example.

A transmission corridor constructed decades ago determines:

where generation can connect;

available transfer capacity;

congestion patterns;

system stability;

future renewable integration.

New renewable projects may be located in regions different from historical generation centres.

Consequently, the existing network can become a structural constraint on future energy policy.

The law must then address:

transmission planning;

open access;

connection rights;

congestion;

cost allocation;

stranded transmission investment.

Recent Supreme Court jurisprudence continues to emphasise the regulatory authority of electricity commissions over tariff and transmission-related matters. (Sci API)

11. Path Dependence and Consumer Tariffs

Consumers are also affected by historical decisions.

A distribution utility may have inherited:

old PPAs;

cross-subsidy structures;

agricultural subsidies;

accumulated regulatory assets;

legacy transmission commitments.

These obligations influence current tariffs.

Thus, a regulator seeking lower tariffs cannot necessarily disregard historical liabilities.

The regulatory problem becomes one of inter-temporal allocation:

Who should bear the cost of decisions made in the past?

Possible approaches include:

current consumers;

future consumers;

taxpayers;

utilities;

generators;

government subsidy;

shareholders.

This makes electricity regulation inherently inter-generational.

12. Important Case-Law Principles

13. Advantages and Problems

Past-dependent governance can provide stability because existing investments and contracts are respected.

It can also:

protect regulatory credibility;

reduce arbitrary policy changes;

support investment certainty;

preserve contractual reliability;

facilitate orderly transition.

However, excessive dependence can produce:

technological lock-in;

fossil-fuel dependence;

obsolete infrastructure;

regulatory rigidity;

stranded assets;

high transition costs;

institutional resistance to reform.

Therefore, the legal challenge is to balance continuity with adaptability.

14. A Governance Model for Managing Path Dependence

A sophisticated electricity governance framework can use five stages:

1. Identify legacy commitments
PPAs, licences, subsidies, assets and regulatory liabilities.

2. Assess their legal status
Determine which obligations are statutory, contractual or merely policy-based.

3. Evaluate transition costs
Identify who bears the financial consequences of reform.

4. Create transition mechanisms
Examples include renegotiation, compensation, tariff adjustment, refinancing, asset retirement and regulatory recovery.

5. Preserve future flexibility
New regulations should avoid creating unnecessary long-term lock-in.

This approach allows governance to recognise history without becoming permanently controlled by it.

15. Conclusion

Past-dependent governance in electricity systems describes the way historical legal, institutional, contractual and infrastructural choices constrain present and future regulatory action.

Its importance is especially visible in:

long-term PPAs;

tariff regulation;

coal and gas generation;

transmission networks;

distribution obligations;

renewable-energy transition;

stranded assets;

change-in-law disputes.

Indian electricity jurisprudence demonstrates that regulatory change cannot be analysed independently of the legal structures created by earlier decisions. PTC India establishes the importance of the statutory regulatory architecture, while Energy Watchdog and subsequent cases demonstrate how existing contractual arrangements continue to shape responses to changing economic and legal circumstances. (Indian Kanoon)

The central legal principle is therefore not that the past must control the future. Rather, effective electricity governance must recognise that past decisions create legally and economically consequential starting conditions for future regulation. The task of energy law is to manage those inherited conditions while preserving sufficient institutional flexibility for technological, environmental and market transition.