How Much Can Your Farm Save With Solar in 2026?

The Reality of Eskom Costs for Farmers

South African farmers are facing electricity cost increases that show no signs of slowing down. Eskom tariffs have risen by an average of 15% annually over the past five years, and NERSA has approved further increases through 2027. For commercial farms drawing power under the Ruraflex tariff, peak-hour electricity now costs upwards of R8.50 per kWh during winter months. That translates to thousands of rands per hour for operations like dairy cooling, irrigation pumps, and pack houses.

The question is no longer whether solar makes financial sense. It does. The question is how quickly you can recover your investment and what kind of returns you can expect over the system's 25-year lifespan.

Understanding Your Baseline: The Ruraflex Tariff

Most farms in South Africa operate on the Eskom Ruraflex tariff, which uses a Time-of-Use (TOU) pricing structure. This means the cost of electricity varies depending on the time of day and the season. Peak hours (06:00 to 09:00 and 17:00 to 19:00 on weekdays) are the most expensive, while off-peak periods are significantly cheaper.

Winter peak rates can be five to six times higher than summer off-peak rates. A farm running a 100 kW load during winter peak hours could be spending over R850 per hour on electricity alone. Over a typical billing period, this adds up to tens of thousands of rands that could be offset or eliminated with a well-designed solar and battery system.

Understanding your TOU profile is the first step. We recommend analysing at least 12 months of Eskom invoices to identify your average consumption per TOU period. This data forms the foundation of any accurate savings projection.

Typical Savings by Farm Type

Dairy farms are among the highest beneficiaries of solar installations. Milk cooling, vacuum pumps, and water heating create consistent daytime loads that align perfectly with solar generation. A typical 100 kWp system on a dairy farm can offset 60% to 80% of daytime electricity consumption, saving between R25,000 and R45,000 per month depending on the season and tariff structure.

Crop farms with irrigation pumps see excellent returns during the growing season. A centre-pivot irrigator running at 30 kW to 50 kW during the day can be powered almost entirely by solar during summer months. The seasonal nature of irrigation means payback periods may be slightly longer, but the savings during active months are substantial.

Mixed farming operations, pack houses, and cold storage facilities all present strong cases for solar. The common thread is any operation with significant daytime electricity consumption.

The Battery Factor: Peak Shaving and Load Shifting

Adding battery storage to a solar installation changes the financial picture dramatically. Batteries allow you to store solar energy generated during the day and discharge it during expensive peak periods, a strategy known as TOU arbitrage.

For a farm paying R8.50 per kWh during winter peak and storing energy at an effective cost of R1.50 to R2.00 per kWh from solar, the arbitrage margin is R6.50 or more per kWh. A battery system that can discharge 50 kWh during each peak window (morning and evening) saves over R650 per day during winter, or roughly R19,500 per month just from peak shaving alone.

Modern lithium-iron-phosphate (LFP) batteries from manufacturers like Sigenergy offer 10,000-cycle lifespans, meaning they can cycle daily for over 27 years before reaching end of life. This longevity makes the total cost of ownership very competitive.

What Does a System Cost?

System pricing depends on the size, configuration, and whether battery storage is included. As a general guide for commercial farm installations in 2026, expect to pay in the range of R4,000 to R5,000 per kWp for a grid-tied solar system without batteries. Adding battery storage increases the investment but also increases the savings and adds backup power capability.

A 100 kWp solar system with 50 kWh of battery storage for a mid-sized dairy farm would typically fall in the R800,000 to R1.2 million range, depending on mounting type (roof vs ground), cable runs, and the electrical infrastructure required.

At current Ruraflex rates, payback periods for well-designed systems typically range from 3 to 5 years. After payback, the system generates essentially free electricity for another 20+ years.

Getting Started

The best way to understand what solar can do for your specific farm is a proper site assessment and load profile analysis. This involves reviewing your Eskom invoices, understanding your consumption patterns, and designing a system that maximises your return on investment.

Off Grid Engineering specialises in commercial and agricultural solar installations across KwaZulu-Natal, the Free State, and Gauteng. Contact us for a free initial consultation and we will show you exactly what you could save.