This guide explains the design choices an EPC contractor and owner face on a wind and solar hybrid in Africa, from pairing the resources to building and operating the plant.
Do the resources complement each other
The case for a hybrid rests on how the wind and solar profiles fit together at the site. Collect hourly data for both resources over at least a year, ideally longer, and overlay them on the demand or export profile. Where wind is strongest when solar is weakest, the combined output is smoother.
If wind and solar peak together, the benefit is smaller and curtailment rises because the shared connection fills up at the same hours. Resource studies must come first; the pre-NTP site investigation guide lists what to measure.
Sizing the shared connection
A key advantage of a hybrid is that the combined capacity of wind and solar can exceed the grid connection, because they rarely produce at full output together. Choosing the ratio of installed capacity to export capacity is a trade-off between more energy and more curtailment.
Model the hourly output and curtailment for several ratios, then choose the one that best meets the owner’s goals. Grid operators may have rules on how much installed capacity can sit behind a connection.
Storage and firming
Battery storage can shift solar energy into the evening and smooth wind variability, reducing curtailment and improving the plant’s value. For mines and industrial users that need firm power, thermal firming with engines or gas turbines may be added. Our page on covering wind lulls with gas turbines explains how firming works.
Design storage and firming with the plant controller from the start. A single controller managing wind, solar, storage and thermal units avoids conflicts.
Layout and land
Wind turbines need spacing to avoid wake losses, while solar arrays need open land without shading. On a combined site, place solar between turbine rows where shading from towers and blades is acceptable, and keep access roads and crane pads for turbines clear.
Shared roads, substations, fencing and operations buildings save cost, but the layout must allow construction of both technologies without conflict.
Civil works and logistics
Wind turbine components are among the largest loads moved on African roads. Route surveys, road upgrades, bridge checks and port handling plans are needed early. Solar components are smaller but arrive in large volumes and need secure storage on site.
Plan the construction sequence so that heavy turbine lifts and solar installation do not compete for the same roads and laydown areas at the same time.
Grid code and connection
Hybrid plants must meet the grid code for voltage control, frequency response, fault ride-through and reactive power at the point of connection. The combined plant may behave differently from separate wind and solar plants, so studies must model the hybrid as a whole.
Agree the metering approach with the grid operator and offtaker. The hybrid metering guide explains how to separate wind, solar and storage output where contracts require it.
Contracts and interfaces
Wind turbines are often supplied under a separate contract with the turbine maker, while the EPC contractor builds the balance of plant and solar arrays. Interfaces between these contracts, such as foundations, cabling, controls and commissioning, must be clearly defined.
A single EPC wrap that takes responsibility for the whole plant reduces interface risk for the owner, but may cost more. Lenders often prefer it.
Operation and maintenance
Wind and solar need different skills and spares. Wind turbines require climbing technicians, heavy component exchanges and specialist service; solar requires module cleaning, inverter maintenance and vegetation control. Combined O&M teams can share site facilities, security and management.
Set performance indicators for each technology and for the plant as a whole. Monitoring data shared between the teams helps spot issues such as curtailment, inverter faults or turbine downtime quickly.
Financing a hybrid
Lenders are familiar with standalone wind and solar plants, but hybrids raise new questions: how energy is allocated between technologies, how curtailment is shared, and how performance guarantees work across two resource types. Clear contracts and robust energy models help answer these questions and support financing.
Independent engineers will review the resource data, the hybrid energy model and the EPC interfaces. Preparing these early shortens the financing timeline.
Is a hybrid right for your project
Hybrids suit sites with complementary resources, limited grid capacity and owners who value steadier output. Where one resource is much stronger than the other, a single-technology plant with storage may be simpler.
Start with resource data and a clear statement of what the owner needs: maximum energy, firm capacity or a particular delivery profile. The design follows from that.
About the EPC team
Combining wind and solar on one connection is a design question our EPC engineers handle in African markets. Practical points from the USP&E renewable and hybrid EPC engineers, who design and build power plants for utilities, mines and independent producers in Africa and beyond. USP&E owns delivery and operation on its projects, with no brokering role, and has 24+ years in the field, 25,000 MW contracted since 2002 and 150+ power projects in 45+ countries. Read about our hybrid power systems.
Offices: Colorado Springs (1755 Telstar Dr, Suite 300), Knoxville (800 S Gay St, Suite 700), London (162-168 Regent Street), Johannesburg (22 Kildoon Rd, Bryanston), Cape Town (31 Brickfield Road, Woodstock) and China (No. 1 Ningzhou Road, Wuxi). Regions: USA | AFRICA | UK | UAE | CHINA. ISO 9001 and ISO 45001 certified.
Questions about wind and solar hybrids
What is a wind and solar hybrid plant?
A plant that combines wind turbines and solar arrays on one site, usually sharing a grid connection, roads, substation and operations facilities.
Why combine wind and solar?
Where the resources peak at different times, the combined output is steadier, and the shared connection is used more efficiently.
Can installed capacity exceed the grid connection?
Yes, because wind and solar rarely produce at full output together. The right ratio balances extra energy against curtailment.
Do hybrids need battery storage?
Not always, but storage can reduce curtailment and shift energy into high-value hours. Firm power users may also add thermal firming.
Who supplies the wind turbines in a hybrid EPC?
Often the turbine maker under a separate contract, with the EPC contractor building the balance of plant and solar. A full EPC wrap is also possible.
Exploring a hybrid site?
Share your wind and solar resource data and the grid connection details, and our engineers will outline a hybrid configuration.
Phone +27 10 822 2324, email info@uspeglobal.com with your site data, or go through the renewable EPC enquiry form. Firming units for hybrid plants can be found in our gas turbine listings.