You’ve navigated rising fuel prices, inflation, and supply chain disruptions. But there’s one cost that keeps climbing relentlessly, year after year, regardless of how well your business performs: electricity.
Eskom’s tariffs have increased by more than 190% since 2014. The most recent NERSA-approved hike of 12.74% took effect in April 2025, with further increases of 5.36% and 6.19% already approved for 2026 and 2027. That’s a compounding, above-inflation burden that your business has no control over — unless you act.
The good news is that a growing number of South African commercial and industrial (C&I) businesses are solving this problem permanently. By investing in solar PV and battery energy storage, they’re replacing volatile grid tariffs with fixed, predictable energy costs that protect margins for 15 to 25 years.
Here’s why electricity cost volatility is so damaging — and how your business can eliminate it.
Why Electricity Cost Volatility Is a Strategic Business Problem
Most businesses treat electricity as a fixed overhead. It isn’t. It’s one of the most unpredictable line items on your P&L — and it’s getting worse.
The pattern is consistent: Eskom applies for above-inflation increases, NERSA approves a moderated version, and businesses absorb the difference. This has happened every single year for nearly two decades. What makes the current cycle particularly challenging is that the increases are now compounding on an already-inflated base.
| 💡 Key figures your CFO needs to know• Eskom tariffs up 190% since 2014 (CSIR, 2024)• 12.74% increase approved for 2025/26• 5.36% and 6.19% further increases approved for 2026/27 and 2027/28• National average electricity price now ABOVE the cost of solar PV generation (R/kWh 1.95 vs R/kWh 0.50–0.60 for utility-scale solar) |
For energy-intensive businesses — manufacturing, retail, logistics, industrial — every tariff increase directly compresses operating margins. For businesses with long-term contracts or fixed pricing to customers, the impact is even more severe: your input costs rise, but your revenue doesn’t.
The Hidden Cost: It’s Not Just the Tariff
The headline tariff figure understates the true cost of grid dependency. Beyond the per-kWh rate, businesses on municipal or Eskom supply are exposed to:
- Demand charges: Fees based on your peak consumption, which can be disproportionately high for businesses with variable demand profiles.
- Network and capacity charges: Fixed costs that appear regardless of how much electricity you consume.
- Municipal markups: Municipalities add their own margin to Eskom’s bulk tariff. In Ekurhuleni, for example, the 2025/26 increase reached 13.40%.
- Budget unpredictability: Annual electricity budgeting becomes guesswork. Forecasting 3–5 years out is near impossible when tariff trajectories are unknown.
Together, these factors mean that businesses relying entirely on the grid are running a structural cost risk — one that compounds silently each year.
How Commercial Solar Solves the Volatility Problem
Solar energy doesn’t eliminate your electricity costs — but it does something arguably more valuable: it makes them predictable.
Once a commercial solar PV system is installed and commissioned, the cost of the energy it generates is effectively fixed. You’ve paid for the infrastructure upfront (or via a structured finance arrangement), and the sun doesn’t send invoices. This is the fundamental value proposition that is driving C&I solar adoption across South Africa.
Cost Certainty Over 20+ Years
A well-designed solar system has a productive lifespan of 25 years or more. The capital cost is a one-time investment. From that point forward, every unit of energy your system generates is energy you’re not buying from Eskom at an ever-increasing tariff.
For businesses that have completed a proper solar feasibility analysis, the internal rate of return (IRR) on solar investments typically ranges from 15% to 25% — a return that improves every time Eskom raises its tariffs.
Multiple Financing Routes, Including Zero-Capex Options
The objection many businesses raise is capital outlay. But commercial solar no longer requires large upfront expenditure. South African businesses can access solar through:
- Self-funded: Full ownership with maximum long-term savings and Section 12BA tax incentive eligibility.
- Lease agreements: Fixed monthly payments, no large capex, system ownership transfers at end of term.
- Power Purchase Agreements (PPAs): Pay only for the energy you consume, at a rate locked below Eskom’s tariff. Zero capex required.
Each route has different implications for cash flow, tax treatment, and long-term cost savings. Getting the right structure requires independent advice — not the recommendation of an installer who benefits from a particular financing model.
Adding Battery Storage: Protecting Against Future Volatility
For businesses looking to maximise their energy independence, pairing solar with a Battery Energy Storage System (BESS) adds another layer of cost control. BESS allows businesses to store solar-generated electricity for use during peak tariff periods — when grid electricity is most expensive — further reducing grid dependency and demand charges.
As Eskom’s tariff unbundling separates time-of-use pricing more clearly, businesses with battery storage will be increasingly well-positioned to minimise exposure to peak pricing windows.
Explore SOLINK’s Battery Energy Storage advisory services → solink.co.za/services/
The Cost of Waiting
Every year of inaction on solar is a year of compounding grid tariff exposure. A business spending R500,000 per year on electricity, facing a 12.74% increase, will spend R564,000 next year — and the year after that, more again. The opportunity cost of delayed action grows alongside every tariff announcement.
Businesses that have already made the transition are now insulated from these increases. The businesses that haven’t are falling further behind on energy costs every single year.
| 💡 The solar economics tipping point has already passed.The national average electricity tariff (R/kWh 1.95) now exceeds the cost of generating electricityfrom utility-scale solar PV (R/kWh 0.50–0.60). For commercial rooftop installations, the economicsare similarly compelling. The question is no longer whether solar makes financial sense —it’s how to procure it correctly. |
Frequently Asked Questions
Q: How much can a commercial solar system reduce my electricity bill?
It depends on your energy profile, system size, and financing model, but most commercial solar installations offset between 40% and 80% of grid electricity consumption. A detailed feasibility analysis will model your specific site, consumption patterns, and financial return before you commit to any investment.
Q: What is the Section 12BA tax incentive and can my business use it?
Section 12BA allows South African businesses to deduct 125% of the cost of qualifying solar assets in the year of investment. This significantly improves the after-tax return on self-funded solar projects. Eligibility criteria apply — speak to your financial advisor alongside a solar feasibility specialist to understand how this applies to your business.
Q: What’s the difference between a solar PPA and a lease agreement?
A Power Purchase Agreement (PPA) charges you per unit of electricity consumed from your solar system, typically at a rate below Eskom’s tariff. A lease means you pay a fixed monthly amount to use the system, regardless of generation. Both are zero-capex options, but they have different risk profiles, escalation clauses, and long-term cost implications that should be independently evaluated.
Q: Does SOLINK install solar systems?
No — and that’s the point. SOLINK is an independent technical advisor and project facilitator. We work exclusively for the client, not for an installer’s margin. We manage the full process — from feasibility and procurement through to construction oversight and commissioning — ensuring you get the best solution at the most competitive price. Learn more about our approach at solink.co.za/about-us/.
Q: How long does it take to get a solar feasibility report?
Through the SOLINK Core platform, the process typically takes 2–3 weeks from submission of your site information. You’ll receive a detailed feasibility report covering system design, energy modelling, financial projections, and a comparison of self-funded, lease, and PPA options — giving you everything you need to make an informed decision.
Ready to Stop Paying More Every Year?
SOLINK has facilitated over 200 MW of commercial and industrial solar projects across South Africa, working with businesses like Heineken, Old Mutual, Sandton City, and Eastgate Mall to take back control of their energy costs.
Our independent advisory model means you get an honest, unbiased recommendation — not a sale. From initial feasibility through to final commissioning, we manage every stage of your solar project so you don’t have to.
→ Start your free feasibility via SOLINK Core
→ Explore our full range of services: solink.co.za/services/
→ Learn about the SOLINK Group: solink.co.za/the-solink-group/
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