Role of the National Energy Regulator of South Africa (NERSA)

The National Energy Regulator of South Africa (NERSA) is the statutory regulator responsible for regulating South Africa’s electricity, piped-gas and petroleum-pipeline industries. It was established under the National Energy Regulator Act 40 of 2004 (NERA). In electricity matters, its powers are principally exercised under the Electricity Regulation Act 4 of 2006 (ERA). Courts have repeatedly described NERSA as the custodian and enforcer of the national electricity regulatory framework. (SAFLII)

1. Establishment and legal status

Section 3 of NERA establishes NERSA as a juristic person. Its regulatory mandate extends across three major energy industries:

Electricity;

Piped gas; and

Petroleum pipelines.

The electricity mandate is particularly significant because electricity generation, transmission and distribution involve essential public infrastructure and natural-monopoly characteristics. NERSA therefore performs an important economic-regulatory and public-law function.

In Organisation Undoing Tax Abuse v NERSA (2016), the High Court recognised NERSA's statutory establishment and its responsibility for regulating electricity, piped gas and petroleum pipelines. The judgment also noted that NERSA's regulatory activities are governed by NERA together with sector-specific legislation such as the ERA. (SAFLII)

2. Regulation of the electricity industry

One of NERSA's central functions is regulating the electricity supply industry.

Under the ERA, NERSA regulates activities including:

electricity generation;

transmission;

distribution;

electricity trading;

licensing of electricity infrastructure and activities;

electricity prices and tariffs; and

compliance with licence conditions.

The Supreme Court of Appeal in Eskom Holdings SOC Ltd v Lekwa Ratepayers Association (2022) explained that generation, transmission and distribution are regulated by the ERA and that NERSA is the regulatory authority established under NERA. The Court further confirmed NERSA's licensing role in relation to generation, transmission and distribution facilities. (SAFLII)

Thus, NERSA acts as a regulatory intermediary between electricity suppliers, municipalities, consumers and the state.

3. Licensing function

NERSA's licensing power is one of its most important regulatory functions.

A person or entity undertaking regulated electricity activities generally requires an appropriate licence or must fall within an applicable statutory exemption. NERSA therefore determines whether an applicant satisfies the legal and regulatory requirements for undertaking electricity activities.

Licensing enables NERSA to impose conditions concerning matters such as:

technical standards;

reliability;

financial requirements;

service quality;

safety;

environmental considerations within its statutory mandate;

reporting and compliance; and

tariff regulation.

The licensing system allows the regulator to supervise electricity-sector participants throughout the life of their regulated activities rather than merely granting initial permission.

4. Electricity tariff regulation

Tariff regulation is arguably NERSA's most visible economic function.

Section 4 of the ERA empowers NERSA to regulate electricity prices and tariffs. Section 15 establishes important principles governing regulated prices and tariffs. These include allowing an efficient licensee to recover the full cost of its licensed activities together with a reasonable margin or return, while also creating incentives for efficiency. (SAFLII)

Consequently, NERSA must balance competing considerations:

financial sustainability of utilities;

affordability for consumers;

efficiency;

investment requirements;

service quality;

electricity security; and

broader public-interest considerations.

Case: Casting, Forging and Machining Cluster v NERSA

In Casting, Forging and Machining Cluster of South Africa (NPC) v NERSA (2022), the High Court explained NERSA's role in regulating electricity prices and tariffs and noted that both Eskom and municipal distributors operate under NERSA's tariff regulatory framework. The Court observed that a licensed distributor cannot simply charge whatever tariff it wishes; the relevant tariff must be determined or approved by NERSA. (SAFLII)

This demonstrates that NERSA functions as an economic regulator, not merely as a licensing agency.

5. Regulation of Eskom

NERSA has a particularly important relationship with Eskom, South Africa's major vertically integrated electricity utility.

Eskom generates, transmits and distributes electricity and operates under licences issued by NERSA. (SAFLII)

NERSA therefore regulates significant aspects of Eskom's activities, including:

licences;

tariffs;

revenue requirements;

regulatory compliance;

electricity-sector standards; and

certain infrastructure and market arrangements.

Case: NERSA v Eskom tariff litigation

The Supreme Court of Appeal has considered challenges to NERSA's tariff decisions involving Eskom. In NERSA and Eskom v businesses affected by the additional 1.4% tariff increase, the SCA considered NERSA's approval of an additional electricity tariff increase for the 2016/17 period. The case demonstrates that NERSA's tariff decisions are subject to judicial review and must comply with the statutory framework governing electricity regulation. (SAFLII)

The significance of the case is that regulatory discretion is not unlimited. NERSA must exercise its powers within the legislation and according to lawful administrative procedures.

6. Regulation of municipal electricity tariffs

NERSA also regulates electricity tariffs charged by municipalities that distribute electricity.

Municipalities may operate electricity-distribution systems, but their tariff structures remain subject to the national regulatory framework.

In AfriForum NPC v NERSA (2024), the High Court considered municipal electricity tariffs and NERSA's role in approving them. The Court described NERSA as the custodian and enforcer of the regulatory framework requiring approval of municipal electricity tariffs. (SAFLII)

The case illustrates an important division of responsibilities:

Municipality → calculates/proposes tariff → NERSA considers and approves → consumer pays approved tariff.

This prevents municipalities from treating electricity tariffs as entirely unrestricted local policy decisions.

7. Consumer protection

NERSA's mandate also has an important consumer-protection dimension.

Electricity consumers depend on reliable and reasonably regulated electricity services. NERSA's statutory objectives therefore require consideration of the interests and needs of present and future electricity customers and end-users.

Consumer protection can involve:

tariff oversight;

service standards;

licence conditions;

complaints and regulatory processes;

transparency;

monitoring of licensees; and

protection against unlawful or improperly determined charges.

The courts have recognised that NERSA's regulatory decisions can directly affect consumers and businesses.

8. Public participation and administrative justice

NERSA does not exercise its regulatory powers in a vacuum. Its decisions can constitute administrative action and may be subject to the Promotion of Administrative Justice Act 3 of 2000 (PAJA) and constitutional legality requirements.

NERSA therefore frequently uses:

consultation papers;

written submissions;

public hearings;

stakeholder participation;

reasons for decisions; and

published regulatory determinations.

For example, in a 2025 decision concerning NTCSA's application relating to congestion curtailment, NERSA expressly referred to NERA and PAJA and conducted a consultation and public-hearing process before reaching its decision. (NERSA)

AfriForum litigation

The importance of procedural fairness was particularly visible in later AfriForum v NERSA litigation concerning municipal electricity tariffs. In 2025, the High Court declared NERSA's implementation of its public-participation process for 2025/26 municipal tariff applications invalid. (SAFLII)

This demonstrates that even a technically correct regulatory decision can be vulnerable if the legally required participatory procedure is not followed properly.

9. Judicial review of NERSA

NERSA is an administrative regulator and is therefore subject to judicial oversight.

Courts can review NERSA decisions where, for example:

NERSA exceeds its statutory powers;

mandatory procedures are ignored;

relevant considerations are disregarded;

irrelevant considerations influence the decision;

the decision is irrational or unreasonable in the relevant legal sense;

procedural fairness is denied; or

the decision violates the principle of legality.

The availability of judicial review is important because NERSA exercises substantial economic power over electricity prices and market participants.

City of Cape Town v NERSA

In City of Cape Town v NERSA (2020), the High Court examined NERSA's constitutional and institutional position and considered the relationship between NERSA and the national executive. The judgment described NERSA as a national regulatory authority established as a juristic person under NERA and discussed its position within South Africa's constitutional system of government. (SAFLII)

The case is important for understanding that NERSA's independence as a regulator exists within the broader constitutional and statutory framework governing public administration.

10. Grid regulation and system governance

NERSA also plays a significant role in electricity-grid governance.

It is the administrative authority for the South African Grid Code, which provides regulatory rules concerning the operation of the electricity system.

In a 2025 NERSA determination concerning NTCSA, NERSA stated that the Grid Code provides the regulatory framework for matters including curtailment and ancillary services. (NERSA)

This function becomes increasingly important as South Africa's electricity system incorporates:

renewable generation;

battery storage;

independent power producers;

distributed generation;

transmission constraints; and

new electricity-market arrangements.

11. Promotion of efficiency and sustainable development

NERSA is not simply concerned with keeping electricity prices low.

The statutory tariff framework seeks to encourage economic and technical efficiency. Section 15 of the ERA links tariff regulation with incentives for continued improvements in efficiency. (SAFLII)

This means NERSA must consider questions such as:

Is the regulated utility operating efficiently?

Are consumers paying for legitimate and efficiently incurred costs?

Does the tariff create appropriate investment incentives?

Is infrastructure adequately maintained?

Does the regulatory framework support reliable electricity supply?

Consequently, NERSA occupies an important position between consumer affordability and utility financial sustainability.

12. Regulation of gas and petroleum pipelines

NERSA's role extends beyond electricity.

Under NERA and sector-specific legislation, NERSA also regulates:

Piped gas

The Gas Act 48 of 2001 provides the statutory framework for regulating the piped-gas industry.

Petroleum pipelines

The Petroleum Pipelines Act 60 of 2003 regulates petroleum pipelines and related activities.

NERSA therefore operates as a multi-sector energy regulator, rather than an electricity regulator alone.

Recent litigation illustrates this broader role. In Sasol Oil v NERSA (2025), Sasol challenged NERSA's approval of tariffs applicable to Transnet's petroleum-pipeline system, demonstrating NERSA's tariff-regulatory role outside the electricity sector. (SAFLII)

Important Case Laws

Conclusion

NERSA is a central institution of South Africa's energy regulatory system. Its role combines licensing, tariff regulation, economic regulation, consumer protection, technical and grid governance, monitoring and enforcement, and administrative decision-making. Its importance is particularly evident in the regulation of Eskom and municipal electricity distributors.

At the same time, the case law establishes that NERSA's regulatory authority is statutory rather than unlimited. Its decisions must remain within NERA, the ERA and other applicable legislation and must comply with constitutional principles, administrative justice, procedural fairness and legality. The tariff and public-participation cases demonstrate that courts can scrutinise both the substance and the procedure of NERSA's regulatory decisions. (SAFLII)

Thus, NERSA can be understood as the institutional mechanism through which South Africa seeks to reconcile electricity security, economic efficiency, utility sustainability, consumer interests, lawful administration and long-term energy-system development.