ENERGY LAW AND ACCOUNTING GOVERNANCE IN UTILITY REGULATION

Introduction

Accounting governance in utility regulation concerns the legal rules governing how electricity and other regulated utilities record, allocate, verify and disclose their revenues, operating expenses, capital expenditure, assets and regulated returns. Because electricity networks frequently possess monopoly characteristics, regulators cannot rely exclusively on ordinary market competition to discipline prices. Reliable regulatory accounting therefore allows authorities such as the National Energy Regulator of South Africa (NERSA) to determine whether claimed costs are prudent, whether tariffs are cost-reflective and whether consumers are being required to finance inefficient or unrelated expenditure.

In South Africa, the principal framework derives from the Electricity Regulation Act 4 of 2006 (ERA), licence conditions, tariff methodologies, public-finance legislation and administrative-law principles.

Cost-Reflective Tariff Accounting

Section 15 of the ERA establishes important tariff principles. Electricity tariffs must enable an efficient licensee to recover the full costs of licensed activities, including a reasonable margin or return. NERSA therefore assesses expenditure, projected sales, asset values and revenue requirements before determining allowable revenue.

Accounting information is crucial because a regulator must distinguish legitimate operating expenditure from inefficient, excessive or unrelated expenditure. For municipal distributors, relevant information may include bulk electricity purchases, network operating expenses, retail costs, general expenses, projected sales and reasonable returns.

Ring-Fencing and Cost Allocation

Where a utility conducts generation, transmission, distribution or unrelated commercial activities through the same organisation, accounting separation becomes especially important. Costs attributed to monopoly activities should not improperly subsidise competitive businesses.

Regulatory accounting systems may therefore require ring-fenced accounts, separate divisional calculations, asset registers and transparent cost-allocation methodologies. NERSA's regulatory methodology has historically calculated Eskom's generation, transmission and distribution components separately before determining overall allowable revenue.

Such separation improves transparency and assists regulators in identifying cross-subsidisation, inefficient expenditure and inappropriate transfer of costs between business divisions.

Auditing, Transparency and Public Participation

Accounting governance also supports administrative accountability. Tariff applications must contain sufficiently reliable financial information to permit meaningful regulatory assessment.

In recent municipal tariff litigation, courts have emphasised the importance of cost-of-supply information and meaningful public participation. In 2025, the Gauteng High Court directed NERSA to publish municipal tariff applications together with relevant cost-of-supply studies, where available, so that affected consumers could participate meaningfully in tariff proceedings.

Case Law: NERSA v Borbet SA

Case Name/Citation: National Energy Regulator of South Africa v Borbet SA (Pty) Ltd [2017] ZASCA 87.

Facts: Industrial electricity consumers challenged NERSA's approval of an additional Eskom tariff increase arising from a Regulatory Clearing Account process.

Legal Issue: Whether NERSA's tariff determination constituted reviewable administrative action and whether its application of the tariff methodology was lawful and rational.

Judgment: The Supreme Court of Appeal confirmed that NERSA's tariff determinations constitute administrative action capable of judicial review, although appropriate deference is afforded to the specialist regulator.

Legal Principle/Ratio: Technical tariff decisions remain subject to legality, rationality and procedural fairness.

Significance: Accounting calculations cannot shield regulatory decisions from judicial scrutiny where revenue or expenditure assumptions are challenged.

Case Law: Casting, Forging and Machining Cluster v NERSA

Case Name/Citation: Casting, Forging and Machining Cluster of South Africa NPC v NERSA [2022] ZAGPPHC 927.

Facts: Applicants challenged municipal electricity tariffs, arguing that they lacked a reliable cost basis and were not genuinely cost-reflective.

Legal Issue: Whether tariffs could lawfully be approved without sufficient verified information establishing their underlying supply costs.

Judgment: The litigation scrutinised NERSA's benchmarking methodology against section 15 of the ERA and the requirement for cost-based tariff regulation.

Legal Principle/Ratio: Regulatory tariff decisions require an adequate evidential relationship between authorised revenue and legitimate electricity-supply costs.

Significance: Proper accounting records are fundamental to lawful tariff regulation.

Case Law: Eskom v Emfuleni Local Municipality

Case Name/Citation: Eskom Holdings SOC Ltd v Emfuleni Local Municipality [2023] ZAGPPHC 497.

Facts: Serious failures arose concerning municipal electricity functions and amounts owed for electricity supplied by Eskom.

Legal Issue: What measures were necessary to protect electricity revenues and ensure proper performance of the distribution function.

Judgment: The High Court ordered, among other measures, that electricity revenues collected under the prescribed arrangement be paid into a separate ring-fenced account, from which relevant electricity costs could be paid.

Legal Principle/Ratio: Financial segregation may be legally necessary to protect regulated electricity revenues and ensure accountability.

Significance: The case illustrates how accounting governance can become an operational mechanism for safeguarding utility sustainability.

Conclusion

Accounting governance is a core component of energy regulation. Accurate cost allocation, ring-fencing, auditing, transparent asset valuation and reliable revenue information enable NERSA to determine lawful and cost-reflective tariffs. South African case law demonstrates that utility accounting is not merely a financial-management matter: it directly supports consumer protection, regulatory accountability, financial sustainability and judicial review of energy-sector decisions.