The National Union of Mineworkers' threat to challenge Eskom's restructuring at the Constitutional Court looks like a labour story. It is not, really.
Strip away the language about the “death of Eskom” and NUM is making a solvency argument. More interestingly, it is an argument Eskom's own chairman made first.
Business Leadership South Africa moved quickly to back the reform.
CEO Busi Mavuso used her weekly newsletter on August 3, three days after President Cyril Ramaphosa endorsed the Eskom Restructuring Task Team's Phase I report and two days before NUM's national executive committee met to decide on litigation, to call the endorsement decisive.
She welcomed it “unreservedly” and said the president had made the policy “unambiguous”, with no further debate warranted.
That was a response to the restructuring decision itself. NUM's legal threat did not yet exist.
The response that matters came from inside Eskom.
Chairman Mteto Nyati warned in the days after Ramaphosa's endorsement that transferring transmission assets to an independent operator could trigger change-of-control clauses in Eskom's lending agreements, create accounting complications and unsettle bondholders. He demanded an urgent meeting with the president.
The Presidency publicly pushed back on August 11, with spokesperson Vincent Magwenya saying government would not allow the restructuring to leave Eskom financially worse off.
That same day, NUM confirmed at a Johannesburg briefing that it was instructing lawyers.
The significance is not that Eskom's board has joined the union's campaign. It has not. Eskom's concern is that the financial consequences of moving transmission assets must be resolved before the assets move.
Nyati has pointed to concerns about Eskom's credit profile and wants the roughly R119bn owed to Eskom by municipalities addressed before any transfer.
That is a financial argument, made by the utility's own chairman, that overlaps with NUM's concerns even though the union and Eskom disagree fundamentally about ownership and restructuring.
The mechanics of the dispute
The Phase I report clears the way for a standalone, state-owned Transmission System Operator, separated from Eskom's generation and distribution businesses.
The logic is straightforward. An independent grid operator should allow competing generators access to the network, unlock private investment and help establish the competitive wholesale electricity market that South Africa has been pursuing since 2019. Government says the restructuring is intended to support investment, lower electricity prices and strengthen energy security.
The financial complication is that transmission is a substantial asset.
NUM's energy-sector coordinator, Khangela Baloyi, puts the union's objection in blunt terms. The National Transmission Company South Africa holds roughly R100bn in assets, while transmission accounts for close to 40% of Eskom's balance sheet, according to Nyati.
Nyati and NUM have raised concerns that removing those assets while leaving a substantial portion of Eskom's debt behind could weaken the utility's financial position.
“Once you decide to remove a part of revenue from the Eskom books, it will definitely affect the liquidity of that company,” Baloyi said.
The union's legal theory has moved beyond that economic argument, however.
Baloyi says NUM wants the courts to rule on whether the Presidency had the authority to establish the restructuring task team, arguing that responsibility for Eskom sits with the Department of Electricity and Energy rather than the Presidency.
That is a jurisdictional challenge, not an argument about the economic consequences of restructuring. It is also the legal question on which NUM's proposed court action will turn.
General secretary Mpho Phakedi has confirmed that the union is consulting lawyers to prepare papers, while NUM's NEC has kept the possibility of a strike open alongside the litigation.
Why “it isn't broken” is not the whole argument
NUM's strongest non-legal argument is performance.
Eskom's Energy Availability Factor has risen from around 55% in 2023 to roughly 65% now. The improvement has helped take load-shedding off the front page.
“Presently, Eskom is functioning very well... so why do you want to fix a company that is not broken?” Baloyi asked.
It is a fair question. But it addresses a different problem from the one restructuring is intended to solve.
EAF recovery is about keeping the lights on today. An independent transmission operator is about creating a market structure capable of attracting the generation capacity South Africa will need over the next decade.
Fixing the first does not make the second unnecessary.
The risk lies in the sequencing.
Nyati and Moody's have raised concerns about the effect of restructuring on Eskom's credit profile if the transmission assets are separated before the utility's financial obligations are properly addressed.
Government has said the restructuring can be undertaken without compromising Eskom's financial sustainability. The official Phase I report also sets out requirements relating to Eskom's financial position and lender obligations, while identifying municipal arrears as a problem that needs to be addressed.
The question is therefore whether those financial risks can be resolved quickly enough to allow the restructuring to proceed without weakening Eskom's balance sheet.
What Treasury has to solve
The Presidency says Phase II will now develop the detailed transaction structure and implementation plan. Among the outstanding questions are asset valuations, lender obligations and municipal arrears.
That is where the dispute becomes consequential for investors.
The government wants an independent transmission operator and a competitive wholesale electricity market. Eskom needs to protect its balance sheet. Creditors need clarity over what stands behind their loans. Municipalities need to address debts that have accumulated over years.
Those interests are not necessarily incompatible.
But the clocks may be.
The restructuring process is moving towards implementation while the financial questions surrounding the separation are still being worked through. If Treasury can resolve the creditor and debt issues before the asset transfer, NUM's financial argument becomes considerably harder to sustain.
If it cannot, the union will have found a more serious vulnerability than the politics of restructuring alone.
For investors, that is the part worth watching.
The risk is not simply that NUM wins in court. It is that litigation, creditor concerns and political resistance delay a reform that government is presenting as central to the future electricity market.
Ramaphosa's government has some breathing room from Eskom's operational recovery.
It now has to use that time to resolve Eskom's balance-sheet risks before changing its shape.
- additional contribution The National news team