Edie: Government has set aside £500,000 to help environmental entrepreneurs develop new technologies that could be used to harness the tidal power of the River Severn. The Severn has one of the highest tidal ranges of any river in the world and, if correctly harnessed, could meet a predicted 5% of the UK’s energy demands. Government has been holding a consultation into the possible technologies and has come up with a shortlist of possible schemes including barrages of varying sizes …