A wave energy generator which was launched off the New South Wales south coast of Australia in March, has sunk in rough seas. The 170-ton structure had been providing electricity to the grid from 150 meters offshore at Port Kembla. It broke free from its pylons last Friday afternoon and sank on Saturday. Early efforts to tow the barge to safety were abandoned due to the rough conditions. Attempts to retrieve the barge will be made this week. The generator's Sydney-based developer, Oceanlinx is investigating what happened.