The Eclipse on August 21st, 2017 gives us some excellent graphs and charts to study, giving us real-world data to interpret. The CAISO agency provided data on the day of the eclipse that shows a dip in solar energy MWs during the eclipse. They also provide lots of graphs and charts each day to show how renewables try to meet the demand for electricity. Questions about the data provided in graphs and a chart are challenging and make the students think. An answer key is provided. Hope this meets some of your requests for more challenging data study.