Vaisala Validates Accuracy of Wind Assessment Methodology

Vaisala, a global leader in environmental and industrial measurement, recently performed an extensive validation confirming the accuracy of its state-of-the-art energy assessment methodology.


The results of this assessment validation process have revealed that the wind projects in the validation study performed within 0.1 percent of Vaisala’s pre-construction estimates during the years analyzed on average.

This statistic is based on a comprehensive analysis of 30 operational wind farms, totaling 127 wind farm years. Of the years encompassed by the study, 90 percent were between 2010 and 2015, providing a significant sample size while still ensuring that projects’ measurement techniques were up to modern standards. The results confirm that Vaisala’s calculations are calibrated and in line with P50 wind energy estimates.

For the last decade, underperformance has been a key concern of the wind industry, and investigations have revealed that more sophisticated assessment methods are required to improve pre-construction energy estimates during the due-diligence phase.

While Vaisala’s approach to energy assessment follows many of the standard practices that are familiar to the industry, it has also introduced several new innovations.

For example, Vaisala pioneered the broad integration of numerical weather prediction (NWP) models into the wind resource assessment process and works with ensembles of all the leading global reanalysis datasets to more accurately characterize the impacts of climate and weather at a project.

The company also relies on full time series data rather than averaged quantities to show the influence of unusual weather patterns more realistically. In addition, it has developed a next-generation uncertainty model known as the Energy Risk Framework that captures risk at every step in the assessment process, incorporating complex dependencies ignored in classical approaches.

“Our techniques move the industry forward by addressing shortfalls in the standard approach,” said Matthew Hendrickson, global manager of energy assessment at Vaisala. “The advantage of using next generation methods like NWP modeling has already been demonstrated in recent industry validation studies. The transparency of our method and how we communicate risk makes our science accessible to clients, building confidence and trust. As a responsible player in the industry, we felt it critical to validate our methods and answer the simple question of how well we predicted actual plant production.”

With advantages in both modeling technique and risk characterization, Vaisala has gained respect with a number of global banks and investors, increasingly becoming their preferred choice. Today, the company is in regular outreach with key investors and is working toward universal acceptance of its approach.

“While these results are encouraging, this study is only the first cycle of a perpetual feedback loop,” Hendrickson said. “As technology evolves and greater sophistication is required, this ongoing validation process ensures that Vaisala continues to lead the industry with cutting edge-science while maintaining an accurate and calibrated wind assessment process.”

— Source: Vaisala

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