The plug-in hybrid ferries Munken and Lagatun is now serving the route Flakk - Rørvik. across the Trondheimsfjord.
Here is a video made by Capt. Jan-Olav Storlie who serve on them:
https://www.youtube.com/watch?v=JsBVnT-lKQs
A presentation of the MF Munken and MF Lagatun:
http://maritimt.com/nb/batomtaler/lagatunmunken-012019