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Analysis of interannual variability of sunshine hours and precipitation over Peninsular Spain

Author

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  • Gil, Victoria
  • Gaertner, Miguel A.
  • Sanchez, Enrique
  • Gallardo, Clemente
  • Hagel, Edit
  • Tejeda, Cesar
  • de Castro, Manuel

Abstract

Solar energy is one of the more abundant sources of renewable energy. It would be desirable that it is more stable over time than other energies with high interannual variability like hydropower. In this study we analyse the interannual variability of sunshine hours and precipitation over Spain, with the aim of comparing the reliability of solar energy to hydropower. An analysis in this respect has not been done before. We have used data from almost 100 stations in the WMO–AEMET (Spanish State Agency for Meteorology) network, and have applied two indices, the coefficient of variability (CV) and the speed of convergence, defined as the number of years of data needed to fully characterize a site. The main result is that the interannual variability for sunshine hours is several times lower than for precipitation over most of Spain, with the exception of the northern coast. The southwestern peninsular area stands out in this respect. This area is characterized at the same time by the highest number of sunshine hours, high speed of convergence and a low maximum departure of annual sunshine hours from the long-term mean. All this make this area optimal and very reliable for placing solar power plants.

Suggested Citation

  • Gil, Victoria & Gaertner, Miguel A. & Sanchez, Enrique & Gallardo, Clemente & Hagel, Edit & Tejeda, Cesar & de Castro, Manuel, 2015. "Analysis of interannual variability of sunshine hours and precipitation over Peninsular Spain," Renewable Energy, Elsevier, vol. 83(C), pages 680-689.
    • Handle: RePEc:eee:renene:v:83:y:2015:i:c:p:680-689
    DOI: 10.1016/j.renene.2015.05.001
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    References listed on IDEAS

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    1. De Miguel, A. & Bilbao, J. & Salsón, S. & Lage, A., 1994. "Solar radiation and sunshine hour maps in Castilla and León region (Spain)," Renewable Energy, Elsevier, vol. 4(8), pages 933-940.
    2. Lave, Matthew & Kleissl, Jan, 2010. "Solar variability of four sites across the state of Colorado," Renewable Energy, Elsevier, vol. 35(12), pages 2867-2873.
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