Best Practices for Solar Assessment

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Did you know?

Year-to-year solar variability—though often dismissed—is significant.
Beyond 25 km of a reliable surface station, satellite data is the most accurate source of irradiance estimates.
TMY data can be used for preliminary site evaluation, but should NEVER be used for financing or due diligence.
It takes up to 15 years of surface measurements to be within +/-5% of the long-term average solar resource value depending on your technology.
Integrating short-term site observations with long-term satellite data provides the most accurate resource assessment for securing project financing.

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3TIER partnered with NREL, the Asian Development Bank (ADB), and the Clinton Foundation to develop today's best practices in solar assessment.

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