It is estimated that 11.5 GW of onshore wind potential exists, enough to provide 45 TWh of energy. More than double this amount exists on offshore sites where mean wind speeds are greater than on land. The total offshore potential is estimated at 25 GW, which although more expensive to install, could be enough to provide almost half the total energy used. Plans to harness up to 4.8 GW of the potential in the inner Moray Firth and Firth of Forth were announced in January 2010. Moray Offshore Renewables and SeaGreen Wind Energy were awarded development contracts by the Crown Estate as part of a UK-wide initiative. Also in 2010, discussions were held between the Scottish Government and Statoil of Norway with a view to developing a 5-turbine floating windfarm, possibly to be located off Fraserburgh. In July 2016, RSPB challenged development in the Firth of Forth and Firth of Tay.