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The forecasts of solar irradiance, wind speed, ambient temperatures and other meteorological parameters play an important role in the field of energy meteorology. This paper is addressed to the forecast of solar irradiance, the comparison of different forecast methods and the use of this irradiance prediction in applications. Solar irradiance forecast can be accomplished with completely different methods, ranging from Fuzzy-Logic-models to synoptic cloud cover forecasts of meteorologists. In the first part of the paper the basic principles of different methods and a comparison of achievable results will be presented. Forecast of meteorological conditions should not practice as an end in itself, but can be used for energy-relevant applications. In this paper the use of solar irradiance and weather forecasts to control the heating and cooling of an office building as well as the energy efficient implementation of a solar thermal power plant into an existing district heating grid is demonstrated.

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