EME 810
Solar Resource Assessment and Economics

8.10 Discussion Activity 8.2


Forecasting Discussion

Our main reading has dealt with strategies for forecasting solar energy. But we haven't discussed the technologies with respect to their relevant metrics of irradiance: GHI and DNI. For example, a PV array is rarely oriented horizontally outside of the tropics, and yet meteorological measurements (current observations) and forecasts only consider GHI at present. And there are very few measurements of DNI or aerosol parameters on the ground (typically because the systems costs for these equipment can be in the range of 10s of thousands of US$). Concentrating solar technologies such as CSP (concentrating solar thermal power) and CPV (concentrating PV) require a high accuracy for DNI, but how good are we at forecasting it?

Please consider the following three bullets to lead your lines of thinking, and address each of them in the DA 8.2 Forum.

  • Given the table of technologies and metrics (Table 8.1) in the reading assignment by Kleissl-Coimbra-Marquez, what is lacking in our knowledge base for solar "current observations"?
  • What transformations of the data need to be done to transpose GHI into an arbitrary POA? Now, given that you have done these transformations in Lesson 4, what is the relative risk in using that transformed data?
  • Compare the required data for CSP and CPV technologies with that required for PV and SHW technologies. Link the data to the metrics.

This discussion will take place in the Discussion Activity 8.2 Discussion Forum.

Grading Criteria

Discussions will be graded on the quality of your post and the thoughtful contributions you make to your classmates' posts. Please see the Discussion Expectations and Rubric under Orientation/Resources.


Typically initial posts are due in the middle of the study week (Sunday), and comments and replies are due by the end of the study week (Wednesday). Please see the Canvas calendar for specific due dates.