As solar energy gains prominence as a sustainable power source, understanding Global Horizontal Irradiance solar (GHI) becomes essential for optimising solar projects. Fortunately, a wealth of online resources exists for those seeking to delve into the intricacies of GHI. Here’s a guide on where to research Global Horizontal Irradiance solar online.

**1. National Renewable Energy Laboratory (NREL):

  • Overview: NREL is a premier institution providing comprehensive solar data and research tools.
  • Resource: The National Solar Radiation Database (NSRDB) allows users to access GHI data for locations worldwide. The PVWatts Calculator, also provided by NREL, aids in estimating energy production based on location and system specifications.

**2. SolarGIS:

  • Overview: SolarGIS offers advanced solar resource mapping and assessment services.
  • Resource: The SolarGIS online platform provides access to high-resolution GHI data, allowing users to analyse solar potential for specific locations. The stage is easy to use and takes special care of the two learners and old pros.

**3. PV-GIS:

  • Overview: The Photovoltaic Topographical Data Framework (PV-GIS) is created by the European Commission.
  • Resource: PV-GIS offers a user-friendly interface for accessing global solar and meteorological data, including GHI. Users can visualise and download data for specific locations and time periods.


  • Overview: NASA POWER (Prediction Of Worldwide Energy Resources) provides access to a range of meteorological and solar data.
  • Resource: Users can utilise the interactive web interface to access GHI data at different spatial and temporal resolutions. The platform is particularly valuable for researchers and professionals requiring accurate and reliable solar information.

**5. The World Bank – Solar Maps:

  • Overview: The World Bank offers solar maps providing GHI and other solar-related information.
  • Resource: These maps provide a visual representation of solar potential globally, making it a useful tool for policymakers, researchers, and businesses looking to assess solar viability in specific regions.

**6. European Solar Radiation Atlas (ESRA):

  • Overview: EZRA is a comprehensive solar radiation atlas covering Europe.
  • Resource: The online version of ESRA provides GHI and other solar radiation data for various European locations. It serves as a valuable resource for those interested in solar energy planning and research within the European context.


Navigating the solar spectrum through Global Horizontal Irradiance research is made accessible by leveraging these online resources. Whether you are a solar enthusiast, researcher, or industry professional, these platforms offer valuable data and tools to optimise solar projects, plan installations, and contribute to the global transition towards sustainable energy. Explore these resources and empower your journey into the world of solar energy research.