Connection Milestone Compliance Requirements

1. Introduction

Connection milestone compliance requirements are the legal, technical and procedural conditions that a generator or electricity customer must satisfy at different stages of a grid-connection project. They ensure that a new power plant or electricity facility does not receive final permission to connect until the required technical studies, construction activities, testing, documentation and regulatory approvals have been completed.

In South Africa, these requirements operate through the Electricity Regulation Act 4 of 2006 (ERA), South African Grid Code, NERSA requirements, connection agreements and electricity licences. The Grid Code establishes minimum technical and design requirements for customers seeking connection to the transmission system, including embedded generators and co-generators.

2. Meaning of Connection Milestones

A connection project normally contains several milestones rather than one single approval. These may include:

submission of the connection application;

completion of technical studies;

acceptance of the connection quotation;

signing of the connection agreement;

completion of network construction;

submission of design and planning information;

equipment testing;

pre-commissioning studies;

commissioning approval; and

final energisation and commercial operation.

The exact milestones depend on the type, size and location of the facility and the applicable connection agreement.

3. Information and Design Compliance

An applicant must provide accurate technical information to the network operator. This can include the proposed commissioning date, location, point of connection, site plans and electrical single-line diagrams.

The South African Grid Code Information Exchange Code requires customers to satisfy system-planning information requirements before the commissioning test date. Estimated information must be confirmed or replaced with validated information where appropriate.

This requirement is important because the System Operator relies on accurate information to determine whether the proposed facility can operate safely within the electricity system.

4. Construction and Connection Milestones

After technical approval and contracting, the parties proceed with construction. The connection agreement can specify responsibilities for:

construction of connection assets;

payment of connection charges;

equipment installation;

protection systems;

metering;

communication systems;

inspections; and

testing.

The Grid Code requires the network operator and customer to agree on the time periods for contracting and connection or upgrading of a connection.

Failure to meet an agreed milestone may therefore result in delays, additional costs or contractual consequences.

5. Testing and Pre-Commissioning

A particularly important milestone is pre-commissioning approval.

The Grid Code requires the System Operator to conduct pre-commissioning studies before sanctioning the final connection of new or modified transmission-system plant. These studies verify that control systems are correctly tuned and that relevant planning criteria have been satisfied. The System Operator can require adjustments before commissioning if problems are identified.

Therefore, construction completion alone does not automatically create a legal right to energisation.

6. Compliance Documentation

Modern connection systems increasingly require documentary proof of compliance. Depending on the facility, this can include:

design reports;

technical studies;

factory test certificates;

commissioning reports;

protection-system test results;

as-built drawings;

equipment certificates; and

declarations of compliance.

For battery-energy storage facilities, NERSA's Grid Connection Code expressly requires owners to demonstrate compliance through design information, study reports, test reports and as-built documentation before connection and commercial operation.

7. Relevant Case Law

Eskom v Sonae Arauco (2024)

The Supreme Court of Appeal confirmed that codes made under section 35 of the ERA can form part of licence conditions and impose binding obligations on electricity licensees. The Court also recognised the System Operator's responsibility to take action necessary to protect reliable grid operation.

Although the case concerned load-shedding rather than connection milestones, it is relevant because it confirms the legal force of electricity codes. A connection participant therefore cannot treat mandatory Grid Code requirements as merely technical recommendations.

Sibanye Gold v Eskom (2026)

This case concerned a 50 MW behind-the-meter solar PV project. Sibanye had obtained regulatory approvals and an Eskom budget quotation, but a wayleave required for the project remained outstanding. The High Court reviewed Eskom's refusal and declared the decision unlawful and invalid.

The case demonstrates that connection-related administrative decisions must have a lawful basis and cannot be delayed or refused for an improper purpose.

8. Importance of Milestone Compliance

Milestone requirements provide certainty, accountability and system security. They allow the network operator to monitor project progress while giving the generator clear requirements for reaching energisation and commercial operation.

They are particularly important for renewable generators because delays in grid connection can affect project financing, power-purchase arrangements and commercial operation dates.

Conclusion

Connection milestone compliance requirements create a structured pathway from application to final grid connection. South Africa's framework combines the ERA, Grid Code, NERSA regulation and connection agreements. The main requirements involve accurate information, technical design compliance, construction, testing, pre-commissioning studies, documentation and final approval.

The decisions in Eskom v Sonae Arauco and Sibanye Gold v Eskom demonstrate that technical and connection requirements have important legal consequences. Proper milestone compliance therefore protects both the electricity system and the legal interests of generators and network users.