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Climate change is impacting U.S. solar energy generation, new study finds


News provided by

Inflection Point Agency for Sunairio

Aug 01, 2023, 06:55 ET

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“This study provides a roadmap... that explains how solar project investors can refine their pro-forma modeling to be confident that future production and revenue targets will be met — even in the face of a changing climate.”

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Baltimore, Md. (PRWEB) August 01, 2023 -- A new study conducted by climate and energy analytics company Sunairio found that climate change is increasingly impacting U.S. solar energy generation. Traditional, industry-standard solar production risk assessment approaches are based on decades-old methods that use historical data and which crucially omit the growing influence of climate trends. As a result, pre-construction energy models over-predict solar production from new projects by up to 5–12%. This impact is strongest in the Midwest and Southeast, followed by the East Coast — regions where climate change is causing decreased irradiance through cloudier weather patterns and greater precipitation.

While other recent studies have identified and attempted to diagnose solar asset underperformance in the U.S., the Sunairio study released today is the first to quantify the influence of climate change in this problem.

“We can’t expect to create accurate solar production estimates if we’re using historical weather data not adjusted for the growing influence of climate change. Those estimates get worse and worse over time, as climate change causes greater and greater deviations from historical norms,” explained Rob Cirincione, CEO of Sunairio. “This is the same problem plaguing flood maps. Future weather risks are being estimated from historical data, but the climate is changing so quickly that modeling based on historical analysis can drastically underestimate the frequency of extreme events and the impact of climate trends going forward.”

To conduct the analysis, Sunairio selected a representative sample of 100 actual utility-scale solar sites across the U.S. and calculated forward-looking, 15-year production estimates for each — taking into account current and expected climate-induced changes in local weather patterns informed by the company’s novel climate simulation techniques.

Sunairio compared these findings to two industry-standard methods — typical meteorological year (TMY) analysis and historical time series analysis — neither of which adjust historical weather data for climate trends. Sunairio found that TMY methods, which have changed little since their introduction in 1978, create a sunnier-than-typical year and thus overly rosy solar generation forecasts.

Across all U.S. sites studied, Sunairio found an average production gap of 2% currently, increasing to 5% by 2034. On an individual site basis, the difference between using conventional backward-looking analysis and a climate-change-aware simulation can be as high as 5% currently and 12% by 2034. For solar project owners, missing energy production translates to much lower project returns. For a project that borrows 75% of capital costs, a 5% revenue drop will cause a 20% drop in equity returns.

“The irradiance trends observed in this study are broadly consistent with the output of global climate models that predict increasing precipitation for much of the Midwest, East, and South,” said Tim Ivancic, PhD, senior data scientist at Sunairio. “This study provides a roadmap (the incorporation of climate modeling insights) that explains how solar project investors can refine their pro-forma modeling to be confident that future production and revenue targets will be met — even in the face of a changing climate.”

The current misalignment in solar production estimates compared to actual generation contributes to decreased confidence from renewable energy investors at a time when stronger investment is needed to reach the U.S. goal of transitioning to a carbon-pollution-free power sector by 2035. More accurate solar production risk assessment can help solar deals meet pro-forma targets and increase investor confidence while improving system planning to further bolster grid reliability.

To download an executive summary or the full white paper, click here.

###

About Sunairio

Sunairio is the first company to leverage climate simulation for energy investment, portfolio strategy, and business insights. Its comprehensive analytics platform replicates climate, asset, and market variability to inform better decision making for all energy stakeholders, including investors, portfolio managers, renewable energy developers, and grid operators such as utilities, ISOs, and electric cooperatives. To learn more about Sunairio, visit http://www.sunairio.com.

Nikki Arnone, Inflection Point Agency for Sunairio, https://sunairio.com/, 1 7708567185, [email protected]

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