According to a recent national-level study, 7% or less teachers feel very prepared to teach engineering. This is major gap. There is a big demand for employees with design and problem-solving skills, and recently NGSS identified engineering as a core discipline in science education.
If you are new to engineering education, or you are looking for some new resources to spice up your curricula, I recommend Teach Engineering. The developers of this site recently updated the user interface and workflow, and content is aligned to the latest educational standards such as NGSS and Common Core.