ELECTRIC SHIPS
On the crest of awave
With a recent report highlighting that one large ship can emit carbon dioxide, nitrogen oxides and carcinogenic particles equivalent to 70,000, 2 million and 2.5 million cars respectively, pressure is mounting for sea-going craft to clean up
10 /// Environmental Engineering /// February 2017 H
ybrid and pure electricmarine vessels (EVs), with electric propulsion some or all of the time, have been around formore than 100 years. The electric boat Lady Lena dates from1890. Currently, themarket for electric and hybrid watercraft is still significantly low, with
about 1-2 per cent of the addressablemarket. Yet over the past 10 years, shaft-driven shipboardmechanical
power transmission has been increasingly replaced by electrical power. For example, both the RoyalNavy Type 45 destroyer and theQueen Elizabeth carrier are electrically driven. The prime mover is used solely for generating electricity, which is then
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