## [Solar and Wind Project Due Diligence Services](/services/solar-and-wind-project-due-diligence-services) Service # Solar and Wind Project Due Diligence Services UL Solutions provides solar and wind project due diligence, energy yield analysis, and risk evaluation to support project financing and investment decisions. [ Contact us ](#form) ![Sunrise on a solar and wind farm](https://delivery-p133222-e1298791.adobeaemcloud.com/adobe/assets/urn:aaid:aem:e95fdf1d-8ee2-4c30-966c-dba1270af92c/as/e95fdf1d-8ee2-4c30-966c-dba1270af92c.webp?&smartcrop=Landscape&max-quality=90&width=400) *play\_arrow* *pause* ## Breadcrumb - [ *keyboard\_arrow\_left* Services ](/services) - [ Home ](/) *pen\_size\_1* - [ Services ](/services) *pen\_size\_1* - Solar and Wind Project Due Diligence Services ## 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](/services/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. ![Wind turbine](https://delivery-p133222-e1298791.adobeaemcloud.com/adobe/assets/urn:aaid:aem:1edadaab-336c-4d01-957a-0907c32ac3b9/as/1edadaab-336c-4d01-957a-0907c32ac3b9.webp?&max-quality=90&width=400) Service ### 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. [ Wind Energy Technical Advisory ](/services/wind-energy-technical-advisory-services) ![Utility scale solar energy project](https://delivery-p133222-e1298791.adobeaemcloud.com/adobe/assets/urn:aaid:aem:23062d09-26f8-416f-a408-d3552a4f93d7/as/23062d09-26f8-416f-a408-d3552a4f93d7.webp?&max-quality=90&width=400) Service ### 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. [ Solar Energy Technical Advisory ](/services/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 and 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 and 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](/services/permitting-and-environmental-impact-assessment-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](/services/wind-and-solar-project-construction-monitoring-and-management). ## 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. ## Services and software ![Building with money stack outside](/modules/custom/ul_component/components/brand_icon/assets/brand-icons-positive/building_with_money_stack_outside.svg) ### Investor due diligence Support for equity acquisitions, portfolio reviews and risk analysis. [ Renewable Energy Investor Services *arrow\_forward* ](/services/renewable-energy-investor-services) ![Risk management](/modules/custom/ul_component/components/brand_icon/assets/brand-icons-positive/risk_management.svg) ### Asset advisory Operational performance, diagnostics and life extension [ Renewable Asset Advisory *arrow\_forward* ](/services/renewables-asset-advisory) ![Wind turbine](/modules/custom/ul_component/components/brand_icon/assets/brand-icons-positive/wind_turbine.svg) ### Wind Energy Techncial Advisory Services Providing independent technical advisory, testing, inspection, certification and software to the wind energy industry. [ Wind Energy Technical Advisory *arrow\_forward* ](/services/wind-energy-technical-advisory-services) ![Solar panel](/modules/custom/ul_component/components/brand_icon/assets/brand-icons-positive/solar_panel.svg) ### Solar Energy Technical Advisory Services A comprehensive portfolio of independent technical advisory, testing, inspection, certification and software services to the solar energy industry. [ Solar Energy Technical Advisory *arrow\_forward* ](/services/solar-energy-technical-advisory-services) ![Energy storage](/modules/custom/ul_component/components/brand_icon/assets/brand-icons-positive/energy_storage.svg) ### ULTRUS™ Energy ULTRUS Energy software not only offers the tools and expertise required to develop cost-effective and reliable energy solutions but also helps to maximize the durability and performance of these systems for long-term financial value. [ ULTRUS™ Energy *arrow\_forward* ](/software/ultrus/energy) ![Wind resource grid](/modules/custom/ul_component/components/brand_icon/assets/brand-icons-positive/wind_resource_grid.svg) ### RRAP Project Prospecting Conduct streamlined preliminary wind energy assessment and reporting to make more informed decisions on project development and investment. [ RRAP Prospect Prospecting *arrow\_forward* ](/software/ultrus/rrap-project-prospecting) ![UL Solutions Abstract Graphics - Full Circuit](https://delivery-p133222-e1298791.adobeaemcloud.com/adobe/assets/urn:aaid:aem:e7ea50f5-1316-41cd-b69c-e2002d1f92d6/as/e7ea50f5-1316-41cd-b69c-e2002d1f92d6.webp?&smartcrop=Portrait&max-quality=90&width=400) ![UL Solutions](/modules/custom/ul_component/components/brand_element/assets/brand-element-positive/mobius.svg) ![UL Solutions](/modules/custom/ul_component/components/brand_element/assets/brand-element-reverse/mobius.svg) ## 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. [ Contact us ](#form) Close *cancel* ### Get in touch Have questions, need specifics? Let's get this conversation started. \* By ticking this box, I confirm that I have read and understood the [Online Policy](https://www.ul.com/resources/online-policies) and consent to the processing of my personal data as described therein. \* By ticking this box, I consent to the cross-border transfer of my personal data as described in the [Online Policy](https://www.ul.com/resources/online-policies). I agree to receive UL Solutions marketing communications and understand that I can opt out at any time without affecting other services by visiting our [Preference Center](https://www.ul.com/preference-center). ##### Thank you! One of our team members will respond to your request as soon as possible. Close ## Related solutions ![The world is in the grass of the green background.](https://delivery-p133222-e1298791.adobeaemcloud.com/adobe/assets/urn:aaid:aem:96b57949-c8a9-4753-b3e5-d9f2c0e7e23f/as/96b57949-c8a9-4753-b3e5-d9f2c0e7e23f.webp?&max-quality=90&width=400) ### Sustainability and Environment We help companies mitigate risk and earn trust among stakeholders to whom companies demonstrate health and sustainability in their product lines, facilities and supply chains. [ Learn more ](/services/sustainability-and-environment) ![Mixed race architect with windmill models working on laptop](https://delivery-p133222-e1298791.adobeaemcloud.com/adobe/assets/urn:aaid:aem:c871b64b-605d-40c0-b372-f9fc3b09fde2/as/c871b64b-605d-40c0-b372-f9fc3b09fde2.webp?&max-quality=90&width=400) ### Renewable Energy Software Solutions UL Solutions offers software tools and data products to support the development, assessment and operation of more efficient renewable energy projects. [ Learn more ](/software/renewable-energy-software-solutions) ## Related services ![Employees performing an environmental assessment](https://delivery-p133222-e1298791.adobeaemcloud.com/adobe/assets/urn:aaid:aem:f62fa936-7c62-44ca-b794-6fe5befbe468/as/f62fa936-7c62-44ca-b794-6fe5befbe468.webp?&max-quality=90&width=400) Service ### Wind Farm Permitting and Environmental Impact Assessment Services UL Solutions provides wind farm permitting and Environmental Impact Assessment services to evaluate project risks and support regulatory compliance. [ Learn more *arrow\_forward* ](/services/permitting-and-environmental-impact-assessment-wind-farms) ![Investors reviewing a pi chart](https://delivery-p133222-e1298791.adobeaemcloud.com/adobe/assets/urn:aaid:aem:80bbdda4-1292-457a-986c-a1bde9018673/as/80bbdda4-1292-457a-986c-a1bde9018673.webp?&max-quality=90&width=400) Service ### Renewable Energy Investor Services UL Solutions’ investor services, tailored to your project’s needs, help you weigh the returns of your renewable energy projects against inherent risks. [ Learn more *arrow\_forward* ](/services/renewable-energy-investor-services) ![Close up of assembling a wind turbine](https://delivery-p133222-e1298791.adobeaemcloud.com/adobe/assets/urn:aaid:aem:989aadda-db45-4ff3-a5fc-62e8d12a0fb8/as/989aadda-db45-4ff3-a5fc-62e8d12a0fb8.webp?&max-quality=90&width=400) Service ### Wind and Solar Project Construction Monitoring and Management UL Solutions provides construction management and monitoring services to assist you in meeting your projects’ schedule, design, quality and budget requirements. [ Learn more *arrow\_forward* ](/services/wind-and-solar-project-construction-monitoring-and-management) ![Workers reviewing an engineering report, with solar panels behind them](https://delivery-p133222-e1298791.adobeaemcloud.com/adobe/assets/urn:aaid:aem:4367c1ab-8639-40e2-8d9b-a14b164db087/as/4367c1ab-8639-40e2-8d9b-a14b164db087.webp?&max-quality=90&width=400) Service ### Wind and Solar Power Independent Engineering Services UL Solutions’ independent engineering reports help developers and lenders evaluate renewable energy projects to identify and mitigate risk. [ Learn more *arrow\_forward* ](/services/wind-and-solar-power-independent-engineering-services) ![Business people discussing a wind turbine model](https://delivery-p133222-e1298791.adobeaemcloud.com/adobe/assets/urn:aaid:aem:04167ca9-38c6-4ccb-a785-ba6869f4e6f0/as/04167ca9-38c6-4ccb-a785-ba6869f4e6f0.webp?&max-quality=90&width=400) Service ### Renewable Energy Technical Advisory Services UL Solutions offers technical advisory services to help you weigh the returns of your renewable energy project against the inherent technical risks. [ Learn more *arrow\_forward* ](/services/renewable-energy-technical-advisory-services) ![Energy storage system paired with wind and solar generation](https://delivery-p133222-e1298791.adobeaemcloud.com/adobe/assets/urn:aaid:aem:f0687606-01b6-4034-80e2-ca55fe0c611f/as/f0687606-01b6-4034-80e2-ca55fe0c611f.webp?&max-quality=90&width=400) Service ### Energy Storage System Testing and Certification Offering solid solutions to address unique safety considerations for system integrators and original equipment manufacturers (OEMs). [ Learn more *arrow\_forward* ](/services/energy-storage-system-testing-and-certification) ![Solar power stations in plain areas, wind turbines in the distance. Yancheng City, Jiangsu Province, China.](https://delivery-p133222-e1298791.adobeaemcloud.com/adobe/assets/urn:aaid:aem:6e3417b0-9575-4732-9c69-982c0d985ae9/as/6e3417b0-9575-4732-9c69-982c0d985ae9.webp?&max-quality=90&width=400) ### Renewables UL Solutions empowers the renewable energy industry to plan, finance, build, certify and operate successful renewable energy projects. [ Learn more *arrow\_forward* ](/industries/energy-and-utilities/renewables) ![power lines](https://delivery-p133222-e1298791.adobeaemcloud.com/adobe/assets/urn:aaid:aem:f18f7721-b664-4022-9f09-45a34961e50e/as/f18f7721-b664-4022-9f09-45a34961e50e.webp?&max-quality=90&width=400) Service ### Grid Solutions Reliable and secure renewable energy forecasting, sophisticated atmospheric modeling and custom research studies to support grid management. [ Learn more *arrow\_forward* ](/services/grid-solutions) ![Illustration of an icon of a person next to a play button and a gear](https://delivery-p133222-e1298791.adobeaemcloud.com/adobe/assets/urn:aaid:aem:9a783d87-387c-4f7e-9be3-8aa18051c398/as/9a783d87-387c-4f7e-9be3-8aa18051c398.webp?&max-quality=90&width=400) Training ### LearnShare™ On Demand Quality EHS training courses can help you mitigate workplace health and safety risks while improving employee performance throughout your organization. [ Learn more *arrow\_forward* ](/software/ultrus/workplace-safety-training-on-demand) ![Graphic depicting the relationship between energy storage and renewable power and the ways HOMER® software can help](https://delivery-p133222-e1298791.adobeaemcloud.com/adobe/assets/urn:aaid:aem:a3383551-fd2c-4f20-ae83-a973997ff5e0/as/a3383551-fd2c-4f20-ae83-a973997ff5e0.webp?&max-quality=90&width=400) Software ### HOMER® Microgrid and Hybrid Power Modeling Software Design and optimize microgrids and hybrid power systems to tackle high energy costs, grid instability and sustainable energy demands. [ Learn more *arrow\_forward* ](/software/homer-microgrid-and-hybrid-power-modeling-software) ## Related resources ![Information circle](/modules/custom/ul_component/components/brand_icon/assets/brand-icons-positive/information_circle.svg) ### Wind and Solar Trends Bulletin UL Solutions’ Wind and Solar Trends bulletins provide a quick view of global wind and solar resource anomalies on a monthly, quarterly and annual basis by country, state or province. [ Read guide *arrow\_forward* ](/resources/wind-trends-bulletin) ![Megaphone](/modules/custom/ul_component/components/brand_icon/assets/brand-icons-positive/megaphone.svg) ### UL to Deliver Technical Due Diligence and Engineering Support for 108 MW Chilean Solar Project Leading safety science and renewable energy project advisor selected by Naturgy as independent engineer on the San Pedro Solar Farm. [ Read press release *arrow\_forward* ](/news/ul-deliver-technical-due-diligence-and-engineering-support-108-mw-chilean-solar-project) ## Download our resource PDF ### UL-Renewables-Due-Diligence-Qualifications UL.com Document [ Download PDF *arrow\_forward* ](https://delivery-p133222-e1298791.adobeaemcloud.com/adobe/assets/urn:aaid:aem:da735af2-479e-4efd-a6b1-689a89b57cf3/original/as/UL-Renewables-Due-Diligence-Qualifications_1121.pdf) [ Download PDF *download* ](https://delivery-p133222-e1298791.adobeaemcloud.com/adobe/assets/urn:aaid:aem:da735af2-479e-4efd-a6b1-689a89b57cf3/original/as/UL-Renewables-Due-Diligence-Qualifications_1121.pdf) ## Frequently asked questions ### What are solar and wind project due diligence services? *add* *remove* Independent, third‑party technical and commercial reviews that evaluate a project’s energy potential, technology and design, site and permitting factors, contracts and financial assumptions, often packaged as an **independent engineering (IE)** review for financing. ### Why is due diligence important for solar and wind energy projects? *add* *remove* It helps **identify and mitigate risks**, align technical performance with commercial terms, and provide **bankable documentation** that supports debt and equity financing. ### What types of assessments are included in renewable energy due diligence? *add* *remove* Typical scopes include **energy production estimates (pre‑construction and operational), technology/site suitability, BoP/electrical design**, and reviews of **contracts, warranties/O&M, environmental/permitting, CAPEX/OPEX**, and **construction oversight**. ### How is a site evaluated during solar and wind due diligence? *add* *remove* UL Solutions conducts **site inspections** and reviews preliminary layouts and environmental/jurisdictional factors; permitting studies can include **noise, shadow flicker, viewshed and photo simulations** to understand community impacts. ### Are environmental and regulatory compliance risks evaluated during solar and wind due diligence? *add* *remove* Yes. Environmental and permitting considerations are integrated, with specialized analyses to **support permit applications** and mitigation strategies where needed. ### What industry standards, codes, or best practices guide renewable project due diligence? *add* *remove* Engagements reference relevant **safety and grid requirements**. For PV, UL content highlights **IEC/UL 61730** for module safety; wind services emphasize **grid code compliance** and performance verification. ### What is the difference between independent engineering and technical advisory at UL Solutions? *add* *remove* **Independent engineering (IE)** provides lender‑ready, objective reports to support financial close. **Technical advisory** provides broader consultative support across development, design, and operations, including resource, technology and contractual reviews. ### Can UL Solutions support construction‑phase monitoring and lender reporting? *add* *remove* Yes, UL provides **construction monitoring and management**, with milestone reviews, QC oversight, test witnessing, drawdown verification, and final completion reporting. ### How does UL Solutions support investors during M&A or portfolio transactions? *add* *remove* Through **investor services** and **technical M&A advisory**, UL tailors critical review paths (energy, technology, contracts, O&M, curtailment/revenue, and portfolio risk) to help buyers and sellers **identify risks and maximize value**.