Understand the impact of solar resource variability on the performance of your solar portfolio

Global Horizontal Irradiation (GHI) is the most important weather factor affecting the energy production of solar photovoltaic power plants. Therefore, having reliable information on recent values of GHI is critical for understanding whether your solar portfolio is performing optimally or not. 

Maps showing recent values can be used as a preliminary and approximate reference, and they can help identify the need for running a more detailed energy assessment in these cases:

  • You find out that map values are not falling within the range of your previously expected values. Then you might need a new estimation of the expected solar resource in the long-term, including an updated monthly variability analysis.
  • You find out that map values are not aligned with your on-site observations and the actual energy generation. Then you might need a review of your on-site sensors, together with a deeper look into possible sources of underperformance in the PV plant.

Download yearly regional difference maps

Yearly difference maps for years 2017, 2018 and 2019 are available for free download from links below. We also provide monthly maps which are available as a free subscription service. In order to receive the monthly difference maps please fill in the form at the bottom of the page.

Subscribe to receive monthly difference maps directly to your inbox

After you subscribe you will receive each month new difference maps for the previous month for all regions. Service is free and you can unsubscribe at any time.
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