MV Lochinvar is a pioneering diesel electric hybrid ferry built for Caledonian MacBrayne. Initially, she operated between Tarbert and Portavadie, was moved to the Mallaig to Armadale route in 2016 and currently operates on the Lochaline to Fishnish route. She is one of only three passenger and vehicle roll-on, roll-off ferries in the world to incorporate a low-carbon hybrid system of diesel electric and lithium ion battery power and is the second hybrid ferry commissioned and owned by Caledonian Maritime Assets. The ferries are sea-going and are 43.5 m (143 ft) long, accommodating 150 passengers, 23 cars or two HGVs. The first ferry, MV Hallaig, entered service on the Sconser to Raasay route in October 2013. The third sister ship, MV Catriona, entered service in 2016.

Caledonian MacBrayne, in short form CalMac, is the trade name of CalMac Ferries Ltd, the major operator of passenger and vehicle ferries to the west coast of Scotland, serving ports on the mainland and 22 of the major islands. It is a subsidiary of holding company David MacBrayne, which is owned by the Scottish Government.