Viewer is a freeware program designed to make it easy to exchange power flow cases. You can view a solved power flow case graphically using animated one-lines. Viewer (and Simulator) can handle cases up to 250,000 buses. Download it for Free!
A heatmap is a color-coded data visualization, usually with a color scale gradient from blue (cold) to red (hot). You can create a data heatmap with spreadsheet tools like Excel, or generate a website heatmap using a free heat mapping tool like Hotjar. 2b1af7f3a8