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Operational Renewable Energy Assessments

High-quality methodologies from UL Solutions provide long-term energy forecasts to support your operational wind and solar plants.

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Industry-leading operational energy assessment services

UL Solutions’ high-quality methodologies are developed in-house and refined to provide long-term energy forecasts for operational wind and solar plants. By using operational data, we can estimate future energy production more accurately than by using standard pre-construction methods alone.

Operational wind and solar energy production reports (OEPRs)

For investors, we provide bankable energy production reports based on operational data. OEPRs fulfill all requirements of bankable energy production reports and provide a clear indication of normal operation and long-term energy projections with lower uncertainty than pre-construction assessments.

Repower energy production report

Wind plants are typically designed for a 20-year lifespan. A full repower involves the complete dismantling and replacement of the existing wind turbines at the site. A partial repower may involve a replacement of the blades with longer ones, or possibly a more significant upgrade of major components, such as drive trains, but is likely to leave the foundations, towers and site infrastructure intact. UL Solutions takes a comprehensive approach to repowering, assessing the current plant from both operational and theoretical perspectives. These complementary viewpoints are merged to create a custom analysis that more accurately predicts the future repowered energy than theoretical models alone.

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Lost energy production report

An independent estimate of lost production is critical for contractual reimbursement of lost revenue as part of business interruption insurance claims or reimbursable curtailment. UL Solutions has state-of-the-art modeling capabilities to comprehensively assess lost production during periods of curtailment, outages or other force majeure events that impact the entire facility, even for periods when there is little to no data collected on-site.

Operational renewable energy assessments for portfolios 

Owning a portfolio of wind and solar projects allows owners to balance local resource fluctuations and reduce the volatility of the revenue stream. In a portfolio, the effect is enhanced with increasing geographic, resource, and technology diversity. UL Solutions has developed tools to perform portfolio energy reports focusing on the effect of reduced uncertainties of operating portfolios against individual operating wind or solar projects. Portfolio assessments are used in numerous transactions and refinancing of portfolios, leveraging the reduced uncertainties for financial benefit. 

Portfolio benchmarking

UL Solutions is the go-to company for operational assessments for many owners and investors. Using a streamlined process, we can also assess entire portfolios of renewable energy plants on a one-time, annual, quarterly or monthly basis. This benchmarking process provides a solid understanding of changes in performance over time, adjusted to account for changes in the underlying wind/solar resources, and flags performance problems.

Portfolio benefit analysis

By evaluating a portfolio as a whole, the result is that the error distribution for the combined output of the projects is often narrower than the summed error distributions of the individual projects. This is known as the portfolio benefit, which may translate into lower risk to the net income for the portfolio owner. To determine the portfolio benefit, it is necessary to estimate the correlations of the various sources of uncertainty and then to combine the results to arrive at an estimate of the likely deviations of the aggregated output. Perfectly correlated project uncertainties yield no benefit, while perfectly uncorrelated project uncertainties would yield the maximum benefit.


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