Service

Solar Energy Testing, Inspection, and Certification Services

UL Solutions provides solar and wind project due diligence, energy yield analysis, and risk evaluation to support project financing and investment decisions.
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Renewable energy due diligence

UL Solutions provides comprehensive renewable energy due diligence to help developers, lenders and investors mitigate risk, validate assumptions and reach financial close with confidence. Our independent team evaluates technical and commercial factors so projects are technically sound and finance-ready.

What we evaluate

Our scopes cover energy production, technology and design, site suitability, contracts and commercial terms, environmental and permitting, CAPEX/OPEX, and construction-phase oversight, with objective reporting recognized by leading arrangers and lenders.

Independent engineering for financing

As your independent engineer, we deliver IE reviews that identify and mitigate project risks for debt and equity stakeholders, supporting a smooth financial close with a report framework vetted by top lenders. Explore our Wind and Solar Power Independent Engineering Services.

Tailored plant due diligence services

Whether you hold a small equity stake or a multi-asset portfolio, we tailor the scope to your risk appetite and in-house expertise, offering plant due diligence services that scale to the investment.

Due diligence for onshore wind services

For onshore wind, our reviews span resource and energy assessments, turbine technology and site suitability, BoP and electrical design, contracts and O&M, with grid integration considerations and bankable reporting. See Wind Energy Technical Advisory Services.

Due diligence solar

For solar, we evaluate array design and energy estimates, module/inverter technology and suitability, BoS/electrical design, warranties/O&M, and readiness for construction and operations. See Solar Energy Technical Advisory Services.

Energy due diligence assessments

Our energy due diligence assessment consulting solutions combine modeling, measurement review and field insight to quantify risk and support investment decisions.

Energy resource & production

We prepare pre‑construction and operational energy production estimates (with P‑tables), review preliminary layouts, and conduct third‑party reviews of energy estimates.

Technology & system design

We perform technology reviews (modules, inverters, mounting structures, system integration), equipment suitability by climate, and extended lifetime assessments, plus civil/geotechnical and electrical design reviews.

Contracts, warranties & O&M

We review EPC/technology supply agreements, warranties, O&M agreements, and operating assumptions to align technical performance with commercial terms.

Environmental and permitting

We consider site inspections and environmental/jurisdictional factors as part of diligence. For project permitting and community impacts (e.g., noise, shadow flicker, viewshed/photo simulations), explore Permitting and Environmental Impact Assessment for Wind Farms.

Construction monitoring

During construction and commissioning, UL Solutions provides lender’s engineer monitoring and construction management, including milestone reviews, quality control oversight, performance test observation, drawdown verification and final close-out reporting. See Wind and Solar Project Construction Monitoring and Management.

On-demand Webinar: Plug-In Photovoltaic Systems: Residential Safety Concerns

Technical overview of safety considerations and certification requirements for residential plug‑in photovoltaic (PIPV) systems, including the UL 3700 safety framework.

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Standards and best practices

PV safety standards

UL Solutions supports projects aligned to PV safety frameworks such as IEC/UL 61730 for modules (see related expert content on our Solar advisory page).

Grid code compliance

Across wind assets, we help stakeholders navigate grid code compliance, electrical characteristics and performance through testing, inspection and certification services.

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Get started

Advance your energy project due diligence with a partner recognized by lenders and developers worldwide. Contact UL Solutions to scope an energy due diligence assessment tailored to your wind or solar project.

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Our comprehensive solar services

Solar energy involves a complex array of systems and components, and we can help you pursue certification across all key areas: