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This document is the final report for the innovation project ELÄTTRA, which is part of Trafikverket’s industry program “Hållbar Sjöfart”. This program is run by Lighthouse and the project has been conducted by RISE Research Institutes of Sweden and Chalmers University of Technology in cooperation with the industrial partners MacGregor AB and SSAB. These organisations have engaged more staff than the authors of this report to the project. The project leader of the project was Andreas Bach at RISE Research Institutes of Sweden. 

The ELÄTTRA project is a follow-up project of the Lighthouse project Electric Light, in which an electric driven RoPax was conceptualized and designed. The Electric Light project concluded that it is crucial to construct electric ships with lightweight and fire-safe materials, which implies that extra high-strength steels are more suitable than aluminum and composite materials for this type of ship structure. Currently, extra high-strength steels are only recommended for building highly specialized applications onboard ships according to class rules. The ELÄTTRA project investigated the potential of re-designing ship structures and sub-structures using extra high-strength steels. The main goal is to develop a practical engineering approach for structural design/optimization of deck structures and the effects on weight reduction. Examples of deck structures of Ro-Ro ships have been selected as the representative structural components to demonstrate the proposed methodology.