Rooftop vs Wheeled Solar: What’s Best for Your Business?
Rooftop vs Wheeled Solar: What’s Best for Your Business?
A Comparative Guide by SOLA Group
In today’s energy landscape, South African businesses are facing a defining choice: how best to transition to cleaner, cheaper, and more reliable energy. Solar power is leading the way – but not all solar is created equal. When evaluating renewable energy options, many companies ask: “Should we install solar panels on our own rooftops, or buy energy from a large-scale solar plant?”
Both options have their advantages, but the best fit depends on your energy needs, available space, and long-term business strategy. In this guide, we break down the key differences between rooftop and wheeled (utility-scale) solar to help you decide what’s the right fit for your business.
How to Find Your Best Fit
Answer a few quick questions to discover which solar solution best suits your business.
1. Cost and Scale Comparison
Rooftop Solar: Smaller Scale, Immediate Savings
Rooftop systems are generally designed for individual facilities, typically ranging between 100 kW and 1 MW. The upfront capital cost can be significant, but once installed, businesses enjoy immediate savings on their monthly electricity bills and protection against rising tariffs.
However, rooftop installations have stringent permitting procedures, and are limited by the available roof space and the structural integrity of the building. This makes them more suitable for small to medium businesses that consume moderate amounts of electricity (under 1MW) during daylight hours.
Ideal for: Smaller energy users such as retail outlets or warehouses with moderate electricity demand at a single site.
Wheeled Solar: Large Scale, Long-Term Value
Utility-scale solar (often referred to as wheeled solar) operates on a completely different scale. These plants, developed and operated by Independent Power Producers (IPPs) like SOLA, can generate tens to hundreds of megawatts (MW) of clean energy.
Through energy wheeling, power is generated at a remote solar farm and “wheeled” through Eskom’s transmission network. This allows businesses with multiple facilities – or those with large energy demands – to access renewable energy without the complexity of needing to build it on-site.
Ideal for: Large energy users such as mining operations, industrial manufacturers, logistics hubs, data centres, and corporate head offices with high electricity demand across multiple sites.
Bottom line:
- Rooftop solar = smaller systems, faster Return On Investment (ROI).
- Wheeled solar = larger, long-term savings and more strategic energy supply for long-term sustainability.
2. Maintenance and Operations
Rooftop Solar: Simple, But Limited
Maintenance for rooftop systems is relatively low but still requires periodic inspections, inverter replacements, and cleaning. Because systems are smaller, the operational costs are minimal, but so are the efficiency gains from economies of scale.
Rooftop installations can also be affected by roof repairs or building renovations, sometimes requiring temporary system downtime.
Wheeled Solar: Professionally Managed
Utility-scale solar plants are maintained by dedicated operations teams using advanced monitoring and predictive maintenance technologies. Businesses buying power through wheeling don’t need to worry about maintenance at all, they simply buy the energy under a fixed, long-term Power Purchase Agreement (PPA).
This model ensures consistent performance, high uptime, and zero operational burden on your business.
3. Land Use and Environmental Impact
Rooftop Solar: Making the Most of Existing Assets
The key benefit of rooftop solar is that it uses existing infrastructure – no need to acquire or disturb land. It’s a smart way to make idle roof space productive while contributing to your company’s carbon reduction goals.
However, rooftops limit how much energy can be produced, especially for companies with high energy demands or limited space.
Wheeled Solar: Expanding Access Through Wheeling
Utility-scale solar plants require large tracts of land, often located in areas with high solar irradiation and minimal environmental impact (all of which is managed by the IPP). These sites are carefully chosen and developed in compliance with environmental standards and often include biodiversity protection measures.
For businesses, this approach eliminates the need to find or manage land while still enabling access to large volumes of renewable energy via the national grid.
4. Financing and Ownership
Rooftop Solar: CAPEX or Small-Scale PPA
Traditionally, rooftop solar can be financed in two ways:
- CAPEX Model: The business owns the system and benefits directly from reduced electricity bills.
- PPA Model: A third party (like SOLA) installs and operates the system, and the business buys the power at an agreed rate.
While both models offer savings, CAPEX requires upfront capital, which can be restrictive for businesses looking to conserve cash.
Wheeled Solar: Longer-Term PPA
Utility-scale projects are almost exclusively financed through PPAs between the IPP and the energy buyer. These agreements are customised, typically ranging from 5 to 20 years, with fixed or escalating tariffs that are most often lower than Eskom’s.
This model allows businesses to secure predictable energy pricing without the capital expenditure or operational risk of owning the infrastructure.
Bonus benefit: By entering a PPA with a licensed IPP like SOLA, businesses also contribute to national decarbonisation goals, supporting South Africa’s transition to a greener grid.
5. Key Takeaways
| Factor | Rooftop Solar | Wheeled Solar |
|---|---|---|
| Typical Scale | 100 kW – 1 MW | 5 MW – 100+ MW |
| Ideal For | Small to medium energy users | Medium to large energy users with multiple sites |
| Installation Site | On existing roofs | Off-site, remote solar farms |
| Financing | CAPEX or small-scale PPA | Long-term PPA with IPP (no CAPEX) |
| Maintenance | Business or third-party managed | Fully managed by IPP (SOLA) |
| Land Use | Uses existing infrastructure | Dedicated renewable energy site |
| Cost Savings | Immediate, smaller-scale savings | Large-scale, long-term tariff stability and maximum savings |
SOLA’s Focus: Wheeling for the Future
While SOLA has delivered hundreds of rooftop solar systems across South Africa in previous years, our strategic focus today lies firmly in utility-scale wheeling solutions.
Our most recently constructed 195-megawatt (MW) Springbok Solar Plant in the Free State is South Africa’s first multi-buyer solar facility. The model is pioneering, enabling multiple corporates to procure electricity from a single plant with flexible contract lengths. Read more about this project here.
This model allows us to supply clean, affordable energy to businesses almost anywhere in the country, from our solar assets. It’s how we’re helping power South Africa’s transition to a resilient, low-carbon energy future – one megawatt at a time.
Ready to Find Out What’s Best for Your Business?
Every business’s energy profile is unique, and the right solution starts with a tailored assessment.
If your business is ready to explore renewable energy through a reliable, long-term wheeling partner, SOLA Group can help design a strategy that matches your operational needs, budget, and sustainability goals.
Visit our Buy Energy page to connect with our team and find out how you can start powering your business with real, certified renewable energy.
Africa’s first Multi-buyer Solar Plant (Project Springbok)
Africa’s first multi-buyer Solar Plant ushers in a new era of Energy Wheeling (Project Springbok)
Preparing for SAWEM: Key Lessons from Industry Leaders (Webinar)
Preparing for SAWEM: Key Lessons from Industry Leaders (Webinar) https://www.youtube.com/watch?v=roz
How We’re Wheeling Change and Building Better Communities
Beyond the Blueprint: How We’re Wheeling Change and Building Better Communities The Transforma
Leave a Reply