aQUaMaRINE Power has announced that it has won leases from the Crown Estate to deploy 30 megawatts of its Oyster wave energy converters off north-west Lewis, and a separate 10MW demonstration lease for an area between Siadar and Fivepenny.  Edinburgh-based aquamarine is planning to install as many as 40 Oysters across both sites along a two-kilometre coastline, potentially generating up to 40MW enough energy to power 38,000 homes.  But the company will need to get planning consent from Shetland Islands authority Comhairle nan Eilean Siar and regulator Marine Scotland.  aquamarine Power will now compete with Pelamis Wave Power, also based in Edinburgh, and ScottishPower Renewables for the Scottish Government s ?10 million Saltire Prize, which will reward a commercially viable marine energy device that can generate at least 100GWh over a two-year period.  Vattenfall, a Swedish energy group, and Pelamis also confirmed they have been awarded a lease agreement to take forward the 10MW aegir wave farm off south-west Shetland.