This paper presents an initial validation of a solar radiation service that provides historical, as well as up-to-the-moment solar resource data from satellites, short-term forecasts from cloud motion analysis, and medium term forecasts (up to seven days ahead) from numerical weather prediction models [1].Forecasts are validated for several, climatically distinct regions of the US, investigating single-site performance against ground-truth measurements. We also present an initial analysis of regional performance using satellitederived irradiances as a reference.

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