A Heat Map is the universal method to show energy data over time and volume to provide a quick context to issues based on a pattern view. This requirement is across all industries and mandatory in the facility market place.
Matthew 's idea for package widgets sound more than great to me !
Matthew K commented
Scott, as long as extensibility makes it easy to integrate third party tools, written in compatable format for Pi Vision 4, then low cost tools can deliver this capabilty such as https://www.highcharts.com/demo/heatmap-canvas/dark-unica . For me the issue is how do OSI Saoft make it low cost and technically easy for the non expert to access and integrate this type of package. I would like to see options to licence a few package suppliers of widgets such as these, and make it simple to integrate. Alternatively you can pay a developer to do the integration for you.