When a business decides to go solar, one of the first strategic questions isn’t technical — it’s financial. Do you buy the system outright as a capital investment, or fund it as an ongoing operating expense through a financing partner? More South African businesses are choosing the latter, and the reasons go beyond simply avoiding an upfront cost.
The Traditional Approach: CapEx (Capital Expenditure)
Buying a solar system outright means the business pays the full cost of equipment and installation upfront, and the asset sits on the balance sheet, depreciating over time. The business owns the system, is responsible for maintenance, insurance, and performance risk, and eventually recoups the investment through electricity savings.
This model tends to suit businesses that:
- Have available capital they’d rather deploy into a depreciating, owned asset than hold in reserve
- Have in-house or contracted technical capacity to manage system maintenance
- Want full ownership and no long-term contractual commitment to a financing provider
The Growing Alternative: OpEx (Operating Expenditure)
Under a funded, OpEx-style model — typically structured as a Power Purchase Agreement — a financing partner covers the capital cost, and the business pays a monthly fee based on electricity consumed. This shifts solar from a capital investment to a predictable monthly cost, similar to a utility bill.
This model tends to suit businesses that:
- Prefer to preserve capital for core operations, expansion, or other investments
- Want to avoid taking on technical/maintenance risk
- Value the ability to start saving on energy costs immediately, without a multi-year payback calculation
- Prefer operating costs to sit off the balance sheet rather than as a depreciating capital asset
Why the Shift Toward OpEx Is Accelerating
South Africa’s high cost of capital, combined with continued uncertainty around exact future tariff trajectories, makes businesses increasingly cautious about locking up capital in infrastructure that isn’t part of their core operations. At the same time, the maturity of the local PPA and solar financing market means OpEx-style agreements are now well-established, bankable, and backed by experienced providers — reducing the perceived risk that used to make businesses hesitant to fund solar this way.
A Side-by-Side Look
| Consideration | CapEx (Buy) | OpEx (Fund/PPA) |
| Upfront cost | Full system cost | None |
| Balance sheet treatment | Capital asset, depreciated | Operating expense |
| Maintenance responsibility | Business | Financing provider |
| Performance risk | Business | Financing provider |
| Ownership | Immediate | Deferred or optional |
| Best suited to | Businesses with available capital and technical capacity | Businesses prioritising cash flow and risk transfer |
Making the Right Call for Your Business
The right model depends less on which is objectively “better” and more on your business’s specific financial position, risk appetite, and strategic priorities. A useful starting point is to compare the total cost of ownership under a CapEx model against the all-in monthly cost under an OpEx/PPA model, over the same time horizon.
The Bottom Line
There’s no universally correct answer to CapEx vs. OpEx for solar — but for a growing number of South African businesses, funding solar as an operating expense is proving to be the more accessible, lower-risk path to the same outcome: lower energy costs and less exposure to the grid.
Not sure which model fits your business? Speak to our team for a side-by-side comparison based on your actual usage.