Solar Energy International (SEI) celebrates the week of Earth Day 2015 with the kick off of our 2015 hands-on lab training season and online course sessions starting today – April 20th. Furthermore, SEI is celebrating a milestone this year of training over 40,000 students and alumni world-wide. Hundreds of students from all over the world have registered for this week’s hands-on lab training season kick off session in Paonia, Colorado, an in-person PV101 session in Boulder, Colorado, and five online courses through SEI’s Online Campus.