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Ringfencing revenue for the National Transmission Company South Africa (NTCSA) is regarded as a crucial short-term step for ensuring that the newly operationalised Eskom Holdings subsidiary is placed on a firmer financial footing to begin dealing with the estimated R390-billion grid infrastructure backlog.

However, complete financial and operational unbundling from Eskom, together with further tariff reform, is still required to fully derisk the business and position it to play its central role in facilitating South Africa's transition to an electricity system that does not undermine the country's export competitiveness as key trading partners begin implementing carbon taxes.

This view was expressed by various participants at a Presidential Climate Commission (PCC) roundtable convened at the JSE to deliberate on financial models that could unlock grid investment, including by the private sector.

Eskom has hitherto made a single allowable-revenue application to the National Energy Regulator of South Africa (Nersa) for its generation, transmission and distribution businesses.

Although these applications outline specific requests for the various aspects of the business, there has been a lack of transparency in how that revenue has been apportioned by the vertically integrated utility, which has resulted in revenue allocated to transmission being redirected for other purposes.

NTCSA interim CEO Segomoco Scheppers recently confirmed that while Eskom had been granted R44-billion for its transmission business during the five-year tariff period for the 2018 to 2022 financial years, it had received only R19-billion after a board reprioritisation exercise.

The balance was redirected to Eskom Generation for its much-delayed and over-budget build programme.

Following its operationalisation on July 1, the NTCSA would now be making its own allowable revenue application to Nersa, which is gearing up to begin its adjudication of submissions for the upcoming three-year tariff cycle, which will begin on April 1, 2025.

It has been reported that Eskom will be seeking allowable revenue of R446-billion for 2025/26, which would translate to a hike of more than 36% for direct customers if approved.

However, Nersa is expecting the application - which will continue to be based on the multiyear price determination methodology after the regulator's abortive attempt at overhauling the way tariffs are set - to reflect the unbundling under way at Eskom, which has been led by the separation of NTCSA.

Speaking at the PCC event, Scheppers highlighted the need to ensure that the NTCSA had dedicated revenue for both its operations and to roll-out the Transmission Development Plan (TDP).

The TDP continued to provide the grid-investment roadmap for the country, despite a growing acceptance that it needed updating.

"The question of the tariff is one of the issues that we believe we need to grapple with now," he said, describing it as a difficult problem but also a "precondition" for implementing the grid expansion.

"So, we have to address how we secure these revenue streams that fundamentally underpin the necessary investments."

In a presentation at the PCC event, Meridian Economics MD Grové Steyn argued that there was a need to redesign the current "dysfunctional" transmission tariff structure and increase tariff levels to be cost reflective.

"Eskom's regulated transmission tariff levels currently result in negative returns, and no utility or infrastructure firm is going to finance new assets if that remains the case."

Moving to cost-reflective transmission tariffs was, thus, necessary to support both NTCSA projects, as well as any possible future Independent Power Transmission (IPT) investments by the private sector.

BACKLOG IS TWICE AS BIG

However, Steyn also called for an urgent revision to the TDP, arg...