Load Shedding and Solar: Building the Business Case Beyond Savings

Most businesses underestimate load-shedding costs because they only count diesel generator fuel. The real costs include lost production output, idle staff wages, spoiled perishable stock, disrupted IT systems, and customer churn.\n\nA 2024 BUSA study estimated load shedding costs SA businesses R500 million per stage per day. For an individual business, calculating your cost per hour of outage reveals the true impact.

To build a complete business case, calculate: revenue lost per hour of downtime, cost of diesel generator operation, stock spoilage risk, equipment restart costs, and overtime wages to catch up on lost production.\n\nFor a manufacturer losing R50,000 per hour of unplanned downtime with 4 hours of load shedding per day (Stage 4), the monthly cost is R4.4 million — dwarfing the electricity savings from solar.

Solar alone generates during daylight hours but cannot supply power during evening load shedding. Adding battery storage creates a resilient system that maintains operations through scheduled and unscheduled outages.\n\nBoth the solar panels and batteries qualify for Section 12B when installed as an integrated system. The 125% deduction applies to the combined cost, making the resilience investment significantly cheaper after tax.

Many businesses currently rely on diesel generators costing R5-8 per kWh — 2-3x the grid tariff. Solar with battery storage replaces generator runtime during daylight hours and handles 2-4 hour evening outages.\n\nThe fuel savings alone can justify the battery investment. Factor in reduced generator maintenance, noise reduction, and zero emissions, and the case becomes compelling. Some businesses have fully decommissioned their generators after installing solar-plus-storage.