Abstract
A method capable of forecasting the DHI (Diffuse Horizontal Irradiance), DNI (Direct Normal Irradiance) and GHI (Global Horizontal Irradiance) for targeted locations involved in the installation of concentrating solar plants has been developed at the Casaccia Center of the ENEA located near Rome (Italy). These forecasts are issued daily at 00:00 in the morning and cover a temporal arc of four days which includes the actual day as well as the following three days in hourly time resolution. The method develops and expands upon information taken from Internet and these forecasts are presented as an example on the Internet site for five localities of ENEA interest: http://www.solaritaly.enea.it/Previsioni/PrevisioniEn.php; they are potentially available for every location. The RMSE% of the DNI forecasts on daily basis compared with the measures is 10%. In the Internet age, old methods must be updated to take into account the immense potential available today on the net.
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