Scotland's wave and tidal energy sector has ­invested more than £217million in the country to date, with £31.8m spent in the last 12 months alone, a new ­report shows.

Almost two-thirds of the growing industry's supply chain is Scottish, the Scottish Renewables report found. Marine energy has been forecast to be worth £50billion by 2050.

Lindsay Leask, senior policy manager for offshore renewables at Scottish Renewables, said: "The opportunities are enormous, ­particularly for Scotland."