Rolls-Royce announced that it has conducted successful tests of a 12-cylinder gas variant of its mtu Series 4000 L64 engine running on 100% hydrogen fuel. The tests, carried out by Rolls-Royce Power Systems, showed very good characteristics in terms of efficiency, performance, emissions and combustion.The first installation of mtu engines running on 100% hydrogen is already planned for the enerPort II lighthouse project in the German inland port of Duisburg.