Stena Line has expanded its energy efficiency monitoring programme, installing ClassNK-Napa Green performance monitoring software on four North Sea ferries.The forthcoming outfit of Stena Britannica, Stena Hollandica, StenaTransporter and Stena Transit will bring the total of Stena ships using the system to 26. Napa for Operations' evp, Esa Henttinen, said: "Owners have a lot of questions about monitoring software and whether the technology is mature enough. It's a good sign to the market that Stena already has 22 vessels up and running."
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