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.
2023 GHI difference maps
The maps below show the % deviation in annual GHI sum in 2023 vs the long-term average.
Download yearly regional difference maps
Yearly difference maps for year 2023 are available for free download from the 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.
