If the design treats solar as a standalone project, you risk frequency trips, curtailed output and diesel or gas units that run inefficiently. That means lost production, higher fuel bills and a plant that never delivers the savings you were promised.
Solar EPC From a Contractor Who Firms the Power
USP&E delivers EPC and O&M for solar, hybrid and thermal plants on mines and remote sites, so we design solar to work with the engines, turbines and storage that keep your site running. USP&E brings 150+ power projects in 45+ countries and 25,000 MW contracted since 2002, and our engineers and project managers can design, build and operate the whole hybrid plant under one contract. We work under ISO 9001 and ISO 45001 certified systems with FCPA and OFAC controls. USP&E is a full-service EPC and O&M contractor, not a broker.
Why Remote-Site Solar Needs a Hybrid Design
On your island grid, every cloud passing over your array is a load step for the rest of your plant. Engines or turbines must pick up the shortfall instantly, and the controls must keep frequency and voltage stable. Without proper design, high solar penetration causes trips that stop the process.
A hybrid design sets the solar share, storage size and firming capacity together, with a plant controller that dispatches them as one system. USP&E’s hybrid power systems work starts from your load profile and your process sensitivity, not from the largest array the land will fit.
Battery Storage: Smoothing, Shifting and Spinning Reserve
Batteries do three jobs on a remote hybrid plant. They smooth fast solar ramps, they shift daytime energy into the evening peak, and they provide spinning reserve so fewer engines need to run at low load. Sizing depends on which jobs matter most for your site.
Grid-forming inverters let the battery hold frequency and voltage on its own, which can allow engines to switch off for parts of the day. That is where the largest fuel savings come from, but it needs careful protection and controls design.
| Component | Main role | Design question |
|---|---|---|
| Solar PV | Lowest-cost daytime energy | What share can the grid absorb? |
| Battery storage | Smoothing, shifting, reserve | Which jobs, and for how long? |
| Gas or engine firming | Night load and backup | How many units, at what load? |
| Plant controller | Dispatch as one system | Can it keep frequency stable? |
Gas Firming and the Thermal Side
Most remote hybrid plants keep engines or turbines for night load, cloudy periods and backup. Gas is often preferred where available because it lowers fuel cost and emissions compared with diesel, and natural gas engines/stations handle variable load well; gas turbine generators suit larger, steadier blocks.
Design the thermal side for the way it will actually run: more starts and part-load hours than a conventional plant. Choose units and maintenance plans with that duty in mind, and set minimum loading rules in the controller. Explore solar-diesel hybrid options that fit your fuel.
What to Ask a Solar EPC Contractor
Ask who designs the whole system, not just the array. Ask for a dynamic study of the island grid, how the plant controller will dispatch each source, what the performance guarantees cover, and who maintains the plant afterwards. A solar EPC company that also delivers thermal plant and O&M removes the gaps between contractors.
For larger loads, compare firming with used/new gas turbines, including a remanufactured GE Frame 6B. In the US, the New USP&E FX-45 45MW Modular Gas Turbine for the Hyperscale Data Center sector in the USA offers 2028–2030 slots for hyperscale campuses, and USP&E delivers hyperscale EPC/O&M for AI gas turbines, hyperscale generators and gas turbines for compute. For temporary or mobile solar, see this independent guide to mobile solar trailers. This site’s article on solar hybrid energy for mining covers mining applications. Review USP&E’s hybrid plant capability.
USP&E Offices Serving Solar EPC Buyers
You should not have to explain your load profile three times. For your solar EPC and gas firming project, USP&E links one accountable team across its offices, starting in the US: Colorado Springs (1755 Telstar Dr, Suite 300) and Knoxville (800 S Gay St, Suite 700) for US-side engineering, site walks and equipment follow-up.
London (162-168 Regent Street) sets up commercial structure and finance, Johannesburg (22 Kildoon Rd, Bryanston) leads design, project controls and quality for PV blocks, natural gas engine firming and GT bridges, Cape Town (31 Brickfield Road, Woodstock) adds engineering depth, and Wuxi, China (No. 1, Ningzhou Road, Wuxi) expedites switchgear, transformers and balance-of-plant from Chinese manufacturers.
For mines and remote sites, Johannesburg and Cape Town engineers run the hybrid studies and site delivery, while London supports project finance and Wuxi expedites PV and battery equipment. Regions served: USA | AFRICA | UK | UAE | CHINA. With 25,000 MW contracted since 2002 across 150+ power projects in 45+ countries, USP&E is ISO 9001 and ISO 45001 certified.
Proof From USP&E Projects
These approved projects show USP&E delivering dependable power for demanding sites, the foundation for any hybrid plant.
- USP&E has refurbished seven GE Frame 6B gas turbines to zero hours in-house for major US hyperscale data-centre developers.
- Resolute Mining, Syama, Mali: USP&E supplied, installed and operated a Caterpillar power station for the process plant and process water. Read the case study.
- Kinross Gold, Tasiast, Mauritania: USP&E supplied and installed a Caterpillar backup power station with new switchgear, on time and on budget. Read the case study.
How to Scope a Solar EPC Project for a Remote Site
Your 3-step plan: 1. Share your load profile and fuel options. 2. Get a hybrid design and grid study. 3. Build and operate under one contract.
- Record your hourly load profile and process sensitivity to trips.
- Confirm land, irradiance data and available fuel.
- Size solar, storage and firming together in one study.
- Run a dynamic grid study and define the plant controller logic.
- Agree performance guarantees and O&M before construction.
FAQ: Solar EPC
Which USP&E offices support solar EPC projects?
USP&E supports solar EPC projects from Johannesburg and Cape Town, which lead hybrid studies and site delivery, with Colorado Springs and Knoxville covering US projects. London supports project finance and contracts, and Wuxi expedites PV modules, inverters and battery equipment made in China.
Has USP&E delivered power for remote sites before?
Yes, USP&E has delivered 150+ power projects in 45+ countries, with 25,000 MW contracted since 2002, including power for remote mines and industrial sites. The approved examples in the track record above show the conditions our hybrid plants are designed for.
Is USP&E a solar broker?
No, USP&E is a full-service EPC and O&M contractor, not a broker. We design, build and operate solar, storage and thermal plants ourselves, so one team is accountable for how the whole hybrid system performs, rather than separate contractors blaming each other.
How quickly can USP&E respond to a solar EPC enquiry?
USP&E replies within one working day. Send your load profile, site location, available land and fuel options, and we will outline a hybrid concept with the solar share, storage size and firming capacity that suit your site, your process and your budget.
What does a solar EPC contractor do?
USP&E, as a solar EPC contractor, handles engineering, procurement and construction of the plant: design, equipment supply, installation, testing and commissioning. For remote sites, we also design the storage and firming generation and the controls that make the whole system run as one.
How much solar can a mine’s island grid take?
USP&E sets the solar share through a dynamic study of your grid, because it depends on load, storage, firming capacity and controls. With batteries and grid-forming inverters, high shares are possible; without them, too much solar can cause frequency trips.
Do remote hybrid plants still need gas or diesel?
USP&E designs most remote hybrid plants with gas or diesel units for night load, cloudy periods and backup. Storage reduces how often those units run, but firm generation is still needed for reliability unless your site can accept occasional outages.
Who should maintain a hybrid solar plant?
USP&E recommends one O&M provider for the whole hybrid plant, covering solar, storage, thermal units and controls. Splitting maintenance between contractors creates gaps at the interfaces, which is often exactly where performance problems on hybrid systems start and where accountability gets lost.
Get Solar That Keeps Your Site Running
With a proper hybrid design, your solar cuts fuel costs without risking your process. Without it, cloud cover becomes a trip risk. Let USP&E design the whole system with you.
Talk to an engineer through the USP&E contact page, on +27 10 822 2324 or at info@uspeglobal.com. You can also search the USP&E inventory for equipment that fits.
Powering Possibility. Built for the Frontier.