Solar Power


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Manage the Power of the Sun

e-SolarForecast™ is an online solar generation forecast service for utility-scale solar farms. Our forecasts are provided for a horizon extending to seven days with hourly resolution. The forecasting engine consists of an ensemble of several different intelligent system based models that employ various state-of-the-art technologies. These models capture the non-linear and complex relationship between the generated power and its driving factors such as irradiance, temperature, wind speed, number of operational panels, and more. The required irradiance and weather data is provided by reliable weather data resources that are continuously updated in real-time. You can access forecasts via web posting, FTP and Excel. Our experienced experts continuously monitor model performance, ensuring the most accurate and reliable data at all times.

Market Solar Generation Forecasts

System wide solar generation and corresponding GHI (Global Horizontal Irradiance) forecasts for up to 7 days out are available for the following markets:

North American Power Markets



Proven Solar Forecasting Leaders

  • PRT participated in a three month trial with seven competitors to produce hourly solar generation forecasts for a major Californian utility (August 4, 2015 > October 31, 2015). PRT’s next-day solar generation forecasts were ranked number one (#1) in accuracy.

Client-Specific Solar Farm Forecasts

  • Forecast horizon of up to 7 days out
  • Hourly resolutions
  • 24/7 hourly/sub-hourly update of forecasts using most recent actual generation (if available) and actual/forecasted weather condition
  • Web and Excel® Interfaces with APIs for automated download of forecasts
  • Continuous monitoring of forecast accuracy and actual generation/weather data

Access via Web & Interactive Excel Interface

  • Generation forecasts posted on secure web page in tabular and graphical forms
  • Downloadable files in CSV, XML or other formats via the web page
  • APIs for automated upload or download via FTP or web service
  • Microsoft Excel® interface with variety of tools
    • Irradiance forecasts can be modified to generate corresponding generation forecasts
    • Forecasts can be compared to Like Days in history or other user-selected days
    • Forecast reshaping tools
    • Analysis tools for past performance & accuracy
    • User developed macros can be embedded

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