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The MOSAIC project aims to develop a commercial CSP plant concept over 1GW nominal capacity. High nominal capacity is reached in a modular way, where each MOSAIC module delivers thermal energy to connected thermal energy storage systems that supply their energy to a high capacity power block (>1GW). This modular configuration significantly reduces the specific cost of the power block (€/MW installed). Each MOSAIC module consists of an innovative fixed spherical mirror concentrator arranged in the form of a semi-Fresnel and a moving receiver driven by a low-cost cable tracking system. This configuration reduces the amount of moving parts of the entire system, lowering the cost of the solar field and keeping high concentration ratios. This will ensure high working temperatures and therefore high cycle efficiencies and cost-effective use of thermal storage systems. Energy from the sun is collected, concentrated and transferred to the heat transfer fluid at module level, where, due to the modular concept, the distances from the solar concentrator to the receiver are much shorter than in typical solar tower technologies. As a result, energy collection efficiency is maximized, atmospheric attenuation is minimized, and precision requirements can be lowered. All these technical benefits can contribute to a lower capital cost of the whole system, while ensuring efficiency and reliability. This therefore has a strong impact on the final cost of electricity production.SolarPACES 2018 AIP Conf. Proc. 2126, 060008-1-060008-9; https://doi.

Solar radiation estimation from geostationary satellite images is accepted by the international scientific community, especially where no previous ground radiometric measurements are available. The most accepted methodology is Heliosat. In this work, a combination of the existing methods Heliosat-1 and Heliosat-2 has been implemented for this purpose, and the obtained results are presented. To analyze the results provided by the implemented methodology a validation against measurements has been made. Firstly, solar Global Horizontal Irradiance (GHI) has been estimated from satellite images using data of the Meteosat Second Generation (MSG) satellite corresponding to the period from 2009 to 2011. Secondly, measurements recorded during the same period of time at the Cener station which belongs to the Baseline Surface Radiation Network (BSRN) have been obtained. Both estimated and measured data have been integrated into hourly values for the validation process. The obtained values for Cener BSRN station are a MBE of 2% and a RMSE of 113 W/m2, which are smaller than the recommended values for hourly GHI data (MBE smaller than 5% and RMSE smaller than 160 W/m2). During the months of summer the errors in terms of W/m 2 are bigger than during the months of winter. However, since the irradiance is higher during the months of summer, the errors are smaller in terms of % during the months of summer. Although the methodology can be applied to locations where no ground measurements are available, it is preferable to analyze locations with available measured data.

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