Eskom's Bold Move: Discounted Power for Bitcoin Miners

The ongoing energy crisis in South Africa has compelled its state-owned electricity supplier, Eskom, to rethink its strategies, especially concerning the surplus electricity it produces. In a groundbreaking proposal, Eskom has announced plans to sell this surplus power to cryptocurrency miners at a discounted rate of R1.20 per kilowatt-hour (kWh). This initiative has sparked significant interest and discussion within the cryptocurrency community, but several critical factors will determine its ultimate success.

According to Steven Boykey Sidley, a leading expert in the field and partner at Bridge Capital, the feasibility of Eskom's plan hinges significantly on the scale of the discount offered, which varies by customer type, and the mechanisms in place to ensure miners can effectively manage their electricity usage. In a recent statement, Sidley remarked,

“The idea behind this is a no-brainer – sell electricity at a discount when no one else wants it. The devil lies in the details, though.”

The current proposal is now under review by the National Energy Regulator of South Africa (Nersa), which is consulting on which participants can qualify for this novel tariff over a two-year pilot scheme. The closing date for comments is set for 4 PM on October 23, with public hearings slated for November 3, and Nersa’s final decision expected by December 7.

Understanding the Discount Structure

The proposed discount structure is aimed primarily at customers categorized under high-voltage supply in the southern region of South Africa, although rates may differ across various other transmission zones. This would be particularly relevant, as customers not meeting the high-voltage criteria, specifically those supplied under 500 volts, would not qualify for this discounted rate. Critics of the plan argue that such tiered pricing raises concerns about equity and accessibility.

Sidley also urges more transparency about how the pricing model will work in the long run. He raises pertinent questions about whether miners will have the capacity to switch off during peak hours.

“How much is that discount, and is it economically justifiable? What other so-called ‘time-flexible’ off-takers are there beside bitcoin miners?”

Echoing these sentiments, Christo de Wit, South Africa's country manager at cryptocurrency exchange Luno, commented on the innovative nature of the proposed discount, indicating that it may lead to a productive application of surplus electricity. “This proposal is innovative and forward-looking; it puts surplus electricity to productive use,” de Wit stated.

Operational Challenges and Requirements

The pilot program is based on Eskom's existing Megaflex tariff scheme, designed for large customers. Notably, this scheme's typical weekday daytime hours will transition to off-peak status, allowing for more flexible operation windows ranging between 12 to 16 hours per day. However, the elusive details surrounding demand, capacity, and overall network charges remain undisclosed, complicating any potential participation assessments for interested miners.

Nersa's consultation paper opens discussions about including other flexible customers in the pilot, suggesting it may be worthwhile to classify cryptocurrency mining as a unique customer category. However, the plan has not been without its doubts; previous experiences indicate a reluctance from traditional manufacturers, as they struggle to adjust their production to match fluctuating electricity supplies.

In April, Agnes Mlambo, then acting head of distribution at Eskom, noted,

“In a manufacturing environment, it is not that easy to ramp up and down your production.”

The Need for Demand Responsiveness

Another pressing issue is the requirement for participants to engage in demand-response programs. Nersa's questions include whether mandatory responsiveness, minimum curtailment requirements, and penalties for non-compliance should be included in the pilot’s framework. As Eskom suggests, this program hinges on having sufficient electricity supply to accommodate miners without destabilizing the existing grid.

To provide context, Eskom believes excess capacity can reach anywhere between 5GW to 7GW at different times, owing mostly to surplus solar energy generation during sunlight hours combined with lower night-time demand. A failure to effectively curtail excess production can be costly, leading to a situation where Eskom has previously had to instruct solar and wind generators to halt energy production. In fact, directives for curtailment rose significantly in recent months, indicating an urgent need for a solution.

International Precedents and Lessons

South Africa isn't the first jurisdiction to explore the idea of offering surplus electricity to cryptocurrency miners. Notably, Texas has seen its own initiatives in this arena. Sidley pointed out the successful example of Riot Platforms, which earned $21 million in power credits during the first quarter of 2026 by leveraging their net electricity usage to curtail consumption during peak demand.

In fact, as reported by Riot, their earnings reached an impressive $31.7 million after significantly reducing energy consumption during periods of grid stress in August 2023.

“Crypto mining may place additional pressure on system capacity, increase emissions, and create pricing distortions,”

A participant in the local bitcoin-mining sector, who preferred anonymity, shared insights on the situation, arguing miners could be a solution to the ongoing supply surplus problem. They remarked,

“Eskom has an excess power problem, and what they need is interruptible, intelligent, programmable power demand to stabilize the grid.”

Further Concerns Regarding Financial Viability

Despite the enthusiasm for the proposal, skepticism around its financial viability abounds. One industry insider declared that the pricing of R1.20/kWh is not sufficiently low to be economically sustainable for miners, positing that rates must dip below $0.05 (approximately R0.82) to stimulate considerable interest and participation. As energy prices hovering around R16.36 against the US dollar further assert the importance of robust pricing strategies, stakeholders are left debating how sustainable these operations can truly be.

Some prospective operators remain optimistic, with indications suggesting a tariff rate of R1.30 being potentially viable, although, again, this figure raises questions about whether this amount includes comprehensive costs.

Critically, Nersa has issued a warning that unregulated cryptocurrency operations could exacerbate existing power strains, increase emissions, and create pricing distortions within the sector. If preferred tariffs are implemented without caution, unintended consequences such as cross-subsidization may ultimately shift costs to other customer categories, something that Eskom aims to avoid.

The rapid development of this initiative indicates a spotlight on not only the lucrative world of cryptocurrency but the pressing needs of South Africa's energy landscape. As this discourse evolves, stakeholders in both the energy and crypto sectors will need to collaborate closely to strike a balance between sustainability and innovation.

Nersa is also taking lessons from earlier precedents, such as when a preferential price was granted to ferrochrome smelters, with stipulations that required any revenue shortfall to be managed independently without affecting regular tariff customers. The upcoming discussions are sure to be heated as both sides present their cases in negotiations.

As the deadline for public comments looms, the debate surrounding this unique tariff will ultimately pave significant shifts in how South Africa approaches renewable energy utilization and the potential for cryptocurrency mining in an ever-evolving landscape. Current discussions and decisions will greatly shape the future of both sectors, making this pilot initiative a critical moment in South Africa's energy narrative.