As electricity demand and prices surge, factories, warehouses, and businesses are rapidly shifting to solar-powered energy storage— a cheap and abundant resource during daylight hours. However, while solar-powered energy storage effectively covers daytime needs, South Africa faces an impending energy crisis during morning and evening peak hours, particularly in winter. To ensure energy security and cost efficiency, Eskom must transform into the country’s solar battery.
The Problem: Peak-Time Power Shortages and the Need for Solar-Powered Energy Storage
Solar energy production peaks during midday, but electricity consumption spikes during the early morning and late evening—times when the sun is not available. As more businesses and homeowners adopt solar, peak-hour demand will increase, further straining the national grid. If Eskom continues its current trajectory of across-the-board price hikes, businesses and households will suffer higher costs and increased risk of blackouts.
The Solution: Smarter Energy Management
To prevent a worsening energy crisis, a smarter and more dynamic approach to energy pricing and management is essential. Eskom must leverage peak-time pricing incentives to encourage better energy consumption habits and reduce grid pressure when it matters most.
Time-Sensitive Energy Usage
- Geysers, pool pumps, and other large energy consumers should be programmed to operate off-peak hours (12h00–04h00).
- Smart meters and automated time switches should be incentivised for widespread use to optimise electricity consumption.
- Businesses should be encouraged to shift energy-intensive operations to daylight hours, reducing evening surges.
- Households can also benefit from load shifting, using stored solar energy during peak times instead of drawing from the grid.
Lowering Peak Demand with Flexible Tariffs
- Eskom must introduce dynamic peak-hour pricing, where electricity costs more during high-demand periods (06h00–09h00, 17h00–21h00) and less during off-peak hours.
- Time-of-use billing will encourage industries and households to spread out electricity consumption, balancing demand across the grid.
- Similar models have been successfully implemented in Europe and North America, proving their effectiveness in stabilising energy supply.
- Industrial users should be incentivized to install battery storage solutions that allow them to rely on stored solar power during peak periods.
The Action: Build Peak-Time Capacity Now
South Africa’s energy future depends on its ability to store and manage its abundant solar power effectively. Eskom must urgently invest in pumped storage facilities and peak-time energy generation to create a reliable, round-the-clock electricity system.
Key Investments Eskom Must Make:
- Pumped Hydro Storage: Excess daytime solar energy should be used to pump water into reservoirs, which can generate electricity during peak hours.
- Battery Storage Infrastructure: Large-scale battery storage can store surplus solar energy and release it during peak demand.
- Gas Peaker Plants: While not a long-term solution, peaking gas plants can provide backup generation capacity during peak demand.
- Grid Modernization: Eskom must improve grid flexibility to accommodate more renewable energy sources efficiently.
- Virtual Power Plants (VPPs): A network of small-scale solar and battery systems can be aggregated to function as a large-scale power source, reducing reliance on the national grid.
Why Eskom Must Act Now
- Energy demand is rising as South Africa industrializes and urbanises further.
- Load shedding remains a crisis, and peak-time shortfalls will exacerbate outages if not addressed. Investing in solar-powered energy storage can help alleviate these challenges.
- Relying on coal-based generation is unsustainable, both financially and environmentally.
- Solar power is South Africa’s best resource—but without storage and peak-hour solutions, it alone won’t fix the grid.
- Renewable energy job creation can stimulate the economy and reduce reliance on costly emergency power solutions.
Eskom: The Battery of South Africa’s Future
South Africa has the solar resources, but Eskom must evolve into a dynamic energy storage and management system. Instead of reacting to crises with price hikes and emergency power contracts, Eskom must proactively build the infrastructure to store and redistribute solar energy when it’s needed most.
The time to act is now. Without strategic investment and innovative policies, South Africa risks an unsustainable energy future plagued by rolling blackouts, high electricity costs, and economic stagnation.
Eskom must become South Africa’s solar battery—storing the power of the sun and delivering it when the country needs it most.
-Francois Nortjè
