Understanding Eskom Tariffs in 2025: Why Solar Makes Sense

Electricity prices in South Africa have increased by over 400 percent in the past decade, and the trend shows no signs of slowing. NERSA has approved further increases that will see tariffs rise significantly over the next several years. For households and businesses already struggling with energy costs, solar power offers a hedge against this relentless upward trajectory.

The average South African household now pays between R2.50 and R3.50 per kilowatt-hour, depending on their municipality and consumption level. At these rates, a family consuming 900kWh per month can expect a monthly electricity bill of R2,250 to R3,150. With annual increases of 12 to 15 percent, that same household could be paying double within five to six years.

Solar electricity, by contrast, has a fixed cost. Once your system is installed and paid off, the cost per kilowatt-hour is effectively zero for the remaining life of the panels. Even when factoring in the initial investment and financing costs, solar electricity works out to roughly R0.80 to R1.20 per kWh over the system's 25-year lifespan — a fraction of current grid prices and an even smaller fraction of projected future prices.

For businesses, the case is even more compelling. Commercial electricity tariffs are typically higher, and many businesses operate primarily during peak solar production hours. A well-designed commercial solar installation can offset 60 to 80 percent of daytime electricity consumption, delivering dramatic savings from day one.

The bottom line is straightforward: every year you delay going solar, you pay more for grid electricity while the cost of solar systems continues to decrease. The economics have never been more favourable for South African energy consumers.