AmiMoJo writes from a report via BBC: Following two years of trials of the world's first electric car ferry, named Ampere, Norwegian ferry operators are busy making the transition from diesel. It is thought that 84 ferries are ripe for conversion to electric power, and 43 ferries on longer routes would benefit from conversion to hybrids that use diesel engines to charge their batteries. If this were done, nitrogen oxide (NOx) emissions would be cut by 8,000 tons per year and CO2 emissions by 300,000 tons per year, equivalent to the annual emissions from 150,000 cars. The Ampere uses an 800kWh battery, equivalent to 8 high end Tesla cars. According to a report from Siemens and environmental campaign group Bellona, long-distance ferries are not well suited to electrification, but about 70% of Norway's ferries cover relatively short crossings, so switching to electric power would pay for itself in a few years. The BBC report also mentions some of the challenges associated with converting the diesel ferries to electric ferries. For example, "during initial trials, the fast charging placed excessive strain on the local grid, designed as it was to service a relatively small population," reports BBC. "To lighten the load, high-capacity batteries were put on constant charge on either side of the fjord, ready to transfer the electricity quickly to the ferry's batteries whilst docked."