Energy University  Website has 200+ courses, some of them are collected under specialized development paths, I started on a path a while ago called ‘Energy Efficiency Fundamentals for Industrial Automation & Control Professionals’ and it has the following lessons:

I found them extremely practical actually, it would talk a while to talk a bout the courses so you can browse them at EU website.

after you finish the development path you get a certificate like the one bellow.

Energy Efficiency Fundamentals for Industrial Automation & Control Professionals