Harnessing ‘Blue energy’: A Review on Techniques and Preliminary Analysis Khairul Nisak Md Hasan, Tian Xian Khai, Ramani Kannan and Zainul Azhar Zakaria MATEC Web Conf., 131 (2017) 04013 Published online: 25 October 2017 DOI: 10.1051/matecconf/201713104013