Prosumer Regulations: A constitutional question

Regulation 21(2) of the Nepra (Prosumer) Regulations, 2026 raises a constitutional question that goes far beyond electricity billing. It touches the limits of delegated authority, the doctrine against retrospective impairment, and the sanctity of contracts entered into under a statutory regime.

The clause is drafted to mask the extent of the change it introduces. It repeals the 2015 Net Metering Regulations but declares that agreements executed under them shall continue to remain in force. Yet in the same provision, it directs that billing for those subsisting agreements shall now be governed by the new net billing regime introduced in 2026.

The agreements survive on paper. Their economics do not. This is where the constitutional difficulty begins.

Under the 2015 regime, distributed generators like homeowners, small businesses, industrial consumers were entitled to unit-for-unit netting. Electricity exported to the grid offset electricity imported on a one-to-one basis. That symmetry was not incidental; it was the commercial spine of the arrangement. Investment decisions, financing structures, and payback calculations were built on that guaranteed offset mechanism.

The 2026 Regulations strip the arrangement to its bones. Electricity imported from the grid is billed at retail tariff. Electricity exported is credited at the national average energy purchase price, substantially lower. The change is not a minor tariff adjustment. It alters the economic equilibrium of existing agreements.

The constitutional question is therefore precise, can delegated legislation alter the core economic terms of subsisting contracts without operating retrospectively in substance?

Retrospective in substance, even if not in form

The regulator is likely to argue that the new billing arrangement applies prospectively, since it governs billing cycles after the 2026 Regulations came into force. It does not reopen settled bills. It does not recalculate past transactions.

However, constitutional doctrine does not confine itself to surface chronology.

The Supreme Court in Hitachi Ltd v Rupali Polyester (1998 SCMR 1618) recognised that legislation framed prospectively can nonetheless operate retrospectively if it disturbs vested or accrued rights. A measure is retrospective not merely when it reopens past events, but when it impairs an existing legal right that has already crystallised.

The right to unit-for-unit netting was not an aspirational expectation. It was embedded in a binding regulatory framework under which agreements were executed and investments were made. Once those agreements were concluded and acted upon, the right to have exported units offset against imported units became part of the legal relationship between the parties.

Replacing that mechanism during the contractual term interferes with an existing legal right. The impairment does not lie in recalculating past bills; it lies in altering the future performance of a contract whose economic structure had already crystallised.

In constitutional jurisprudence, such interference has been characterised as retrospective in effect.

The Supreme Court has repeatedly emphasised that laws affecting substantive rights are presumed to operate prospectively unless clear language mandates otherwise. Delegated legislation, in particular, is viewed with caution when it purports to impair accrued rights without explicit statutory authority.

Regulation 21(2), while couched in forward-looking language, effectively restructures the economic consequences of agreements already in force. That is retrospective in substance.

Delegated authority and ultra vires concerns

Nepra derives its powers from the Regulation of Generation, Transmission, and Distribution of Electric Power Act, 1997. It exercises delegated legislative authority. Delegated legislation must remain strictly within the bounds of the parent statute.

In Messrs Mustafa Impex v Government of Pakistan (PLD 2016 SC 808), the Supreme Court made clear that executive and delegated powers must operate within statutory parameters. Authority must be traceable to express legislative delegation; it cannot be inferred expansively.

There is no explicit provision in the Nepra Act authorising the Authority to retrospectively impair the economic terms of subsisting agreements. In Engineer Iqbal Zafar Jhagra v Federation of Pakistan (PLD 2013 SC 504), the Court reaffirmed that subordinate legislation cannot transgress statutory or constitutional limits.

If Regulation 21(2) alters vested contractual rights without clear statutory mandate, it risks being characterised as ultra vires.

Sanctity of contract and unilateral variation

The doctrine of sanctity of contract further sharpens the analysis. In Province of Sindh v Dr. Muhammad Ashraf Dogar (PLD 2009 SC 879), the Supreme Court reiterated that contractual obligations cannot be varied unilaterally absent express legal authority. Likewise, in Wapda v Nishat Textiles (PLD 2011 SC 53), the Court emphasised that arrangements structured under a defined legal framework cannot be arbitrarily altered to the prejudice of one party.

The 2015 net metering agreements were executed under a regulatory regime that guaranteed a particular billing mechanism. Substituting that mechanism mid-term without renegotiation or compensation amounts to unilateral variation. Unless the enabling statute clearly authorises such intervention, the alteration becomes constitutionally problematic.

The fact that the regulation declares the agreements “preserved” does not neutralise the reality that their economic content has been rewritten.

Constitutional protections against arbitrary retrenchment

Article 4 of the Constitution protects citizens from arbitrary state action and guarantees that they shall be dealt with in accordance with law. Article 18 safeguards the right to conduct lawful trade and business. Articles 23 and 24 protect property, and the Supreme Court has consistently interpreted property to include valuable economic interests.

The expected financial benefit flowing from a binding regulatory framework may well qualify as such an interest. When the State induces investment under a defined incentive structure and then materially alters that structure during the agreed term, constitutional scrutiny is engaged.

Public interest arguments, circular debt, fiscal stress, grid stability, are undoubtedly weighty. However, constitutional governance requires that even measures taken in the public interest respect proportionality, legality, and statutory boundaries. Public interest does not authorise retrospective impairment of vested rights without clear legislative sanction.

The IPP parallel

Pakistan’s experience with Independent Power Producers provides a cautionary context. The Supreme Court has repeatedly underscored that state instrumentalities are bound by their contractual and legal commitments. Attempts to unsettle tariff structures or contractual frameworks after crystallisation have repeatedly attracted judicial scrutiny.

The lesson from those episodes is not ideological. It is structural: regulatory credibility depends upon legal predictability.

Conclusion

Regulation 21(2) attempts to preserve existing agreements while restructuring their economic consequences. The constitutional difficulty lies in whether such restructuring constitutes retrospective impairment of vested rights effected through delegated legislation lacking explicit statutory authority.

Constitutional law looks beyond labels. If the substance of an existing contractual right is altered mid-term, the measure may be retrospective in effect even if prospective in wording. The preservation of form does not cure the erosion of substance.

Ultimately, the question is not whether regulatory reform is desirable, but whether it can be pursued at the expense of crystallised legal rights without clear legislative mandate. In its present form, the provision appears almost designed to invite scrutiny by the Supreme Court.

Whether Regulation 21(2) survives will depend on whether the Court views it as a permissible policy recalibration or as an unconstitutional rewriting of subsisting bargains. That determination may soon define the outer limits of delegated authority in Pakistan’s power sector.

Copyright Business Recorder, 2026