Energy companies in the UK see potential from underwater turbines that produce electricity . Sea water is 832 times denser than air , which means the turbines can be smaller while producing a similar amount of energy to a wind turbine . The energy is consistent and predictable ; they can model output 100 years in the future . Shell has placed four turbines in the north of Scotland to harness the tidal power of Pentland Firth . The energy generated has the potential to produce 1.2GW , the equivalent of two nuclear power plants .
Energy companies in the UK see potential from underwater turbines that produce electricity . The energy is consistent and predictable ; they can model output 100 years in the future . Shell has placed four turbines in the north of Scotland to harness the tidal power of Pentland Firth . The energy generated has the potential to produce 1.2GW , the equivalent of two nuclear power plants .