I just published a GitHub repository for a project that I'm working on. It's a combination of lessons in how to build applications with the Wolfram Language and code for an application for tracking energy consumption. My hope is that by combining lessons in the Wolfram Language with an application that students could actually apply at their school that this will prove to be a useful way to engage students.
If anyone is interested, I am looking for feedback, collaborators, and schools that might be interested in testing this out. The GitHub repository is linked below, as is the notebook that contains the current iteration of the project.
Project GitHub Repository