As electricity prices in South Africa continue to rise and time-of-use (TOU) tariffs become more widespread, the way businesses think about energy is changing. Many have already made the move to solar PV, but as tariffs evolve, solar alone may no longer be enough. This is where battery energy storage systems (BESS) and energy arbitrage come in.
Energy Arbitrage: A Strategy for South African Businesses
Energy arbitrage is the process of charging a battery when electricity is cheap and discharging it when electricity is expensive. It allows businesses to shift their energy use away from high-tariff periods without changing how or when they operate.
For example, a business might charge its battery at R1.20/kWh in the morning and discharge it later that day during peak hours, when electricity costs R3.50/kWh. That's a direct saving of R2.30 per kilowatt-hour, achieved simply by timing when stored energy is used.
While many companies see batteries purely as backup, arbitrage offers daily, repeatable savings that significantly improve ROI. Backup is an insurance policy. Arbitrage is a strategy.
A Profitable Opportunity
More municipalities are adopting TOU billing models. With peak rates climbing and off-peak remaining relatively stable, the pricing gap creates an opportunity to use stored energy in a smarter, more profitable way.
Energy arbitrage is especially effective for businesses with solar PV systems. With a battery in place, excess solar can be stored and used later, boosting the effective value of every kilowatt-hour produced.
Solar Systems Designed for Arbitrage Performance
At Forest Energy, we work closely with clients to design systems engineered for arbitrage performance. This involves detailed modelling of your load profile, understanding the tariff you're on, and optimising when and how your system charges and discharges.
Energy arbitrage is ideal for businesses that:
- Are on TOU tariffs like Eskom Megaflex, Miniflex, or similar municipal models
- Have solar systems already installed or plan to install soon
- Experience high energy usage during late afternoons or evenings
- Want to reduce daily energy costs, not just secure backup
How Arbitrage Could Work for Your Business
Arbitrage transforms battery storage from a passive backup system into an active part of your energy strategy. We offer a free simulation based on your historical electricity data.
